test(m9): complete migration of all remaining test suites to XCTest

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.gitea/workflows/macos.yml

@@ -14,13 +14,21 @@ jobs:
   build-and-test:
     # Prefer a self-hosted Mac runner if your Gitea has one. If not,
     # macos-14 works for this pipeline.
-    runs-on: macos-14
+    runs-on: macos-12
     env:
       DERIVED: build/DerivedData-test
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Assert Xcode 14 toolchain
+        run: xcodebuild -version | grep -E "Xcode 14." || (echo "Unexpected Xcode version" && exit 1)
+
+      - name: Ensure host tools
+        run: |
+          command -v xcodegen || brew install xcodegen
+          python3 -c "import dmgbuild" 2>/dev/null || pip3 install dmgbuild
+
       - name: Generate Xcode project
         run: xcodegen generate --spec project.yml
 
@@ -120,7 +128,7 @@ jobs:
 
   package:
     needs: build-and-test
-    runs-on: macos-14
+    runs-on: macos-12
     if: github.ref == 'refs/heads/develop' || startsWith(github.ref, 'refs/tags/v')
     steps:
       - name: Checkout

Packages/ICCeryCore/Package.swift

@@ -1,9 +1,9 @@
-// swift-tools-version: 6.0
+// swift-tools-version: 5.7
 import PackageDescription
 
 let package = Package(
     name: "ICCeryCore",
-    platforms: [.macOS(.v14)],
+    platforms: [.macOS(.v12)],
     products: [
         .library(name: "ICCeryCore", targets: ["ICCeryCore"]),
     ],

Packages/ICCeryCore/Sources/ICCeryCore/Argyll/ArgyllRunner.swift

@@ -200,7 +200,7 @@ public struct ArgyllRunner: Sendable {
         await processManager.kill(id: id)
         var attempts = 0
         while await processManager.isRunning(id), attempts < 30 {
-            try? await Task.sleep(for: .milliseconds(100))
+            try? await Task.sleep(nanoseconds: 100_000_000)
             attempts += 1
         }
     }
@@ -243,7 +243,7 @@ public struct ArgyllRunner: Sendable {
         if flushPartialLines {
             dotFlushTask = Task { [processManager] in
                 while !Task.isCancelled {
-                    try? await Task.sleep(for: .milliseconds(500))
+                    try? await Task.sleep(nanoseconds: 500_000_000)
                     if Task.isCancelled { break }
                     await processManager.flushPartialLine(id: processId)
                 }
@@ -592,7 +592,7 @@ public struct ArgyllRunner: Sendable {
                 await processManager.setPreKillHook(id: processId) { [processManager] in
                     if isXY {
                         try? await processManager.sendStdin(id: processId, bytes: ChartreadInput.quit.bytes)
-                        try? await Task.sleep(for: .milliseconds(500))
+                        try? await Task.sleep(nanoseconds: 500_000_000)
                     }
                 }
 

Packages/ICCeryCore/Sources/ICCeryCore/CGATS/CGATSParser.swift

@@ -72,8 +72,8 @@ public enum CGATSParser {
     public static func parse(
         _ contents: String,
         sourceURL: URL? = nil
-    ) throws(CGATSParseError) -> CGATSDataset {
-        guard !contents.isEmpty else { throw .emptyFile }
+    ) throws -> CGATSDataset {
+        guard !contents.isEmpty else { throw CGATSParseError.emptyFile }
 
         let ext = sourceURL?.pathExtension.lowercased() ?? ""
         let isCSV = ext == "csv" || contents.trimmingCharacters(in: .whitespacesAndNewlines)
@@ -101,10 +101,10 @@ public enum CGATSParser {
         }
 
         guard let formatStart, let formatEnd, formatEnd > formatStart + 1 else {
-            throw .missingBeginDataFormat
+            throw CGATSParseError.missingBeginDataFormat
         }
         guard let dataStart, let dataEnd, dataEnd > dataStart + 1 else {
-            throw .missingBeginData
+            throw CGATSParseError.missingBeginData
         }
 
         let rawFieldNames = splitFields(lines[formatStart + 1])
@@ -139,7 +139,7 @@ public enum CGATSParser {
             let lineIndex = dataStart + offset
             let rawRow = splitFields(lines[lineIndex])
             guard rawRow.count == fieldNames.count else {
-                throw .incorrectArity(line: lineIndex + 1, expected: fieldNames.count, got: rawRow.count)
+                throw CGATSParseError.incorrectArity(line: lineIndex + 1, expected: fieldNames.count, got: rawRow.count)
             }
 
             var sample = RawSample(id: String(offset), lineIndex: lineIndex)
@@ -153,7 +153,7 @@ public enum CGATSParser {
                             groupMax[group, default: 0] = max(groupMax[group, default: 0], number)
                         }
                     } else if !cleaned.isEmpty {
-                        throw .nonNumericValue(field: name, value: raw, line: lineIndex + 1)
+                        throw CGATSParseError.nonNumericValue(field: name, value: raw, line: lineIndex + 1)
                     }
                 } else {
                     sample.strings[name] = raw
@@ -213,7 +213,7 @@ public enum CGATSParser {
     private static func preprocess(
         _ contents: String,
         isCSV: Bool
-    ) throws(CGATSParseError) -> (CGATSFormat, [String]) {
+    ) throws -> (CGATSFormat, [String]) {
         let allLines = contents.components(separatedBy: .newlines)
         var lines = [String]()
 
@@ -239,7 +239,7 @@ public enum CGATSParser {
             lines.append(line)
         }
 
-        guard !lines.isEmpty else { throw .emptyFile }
+        guard !lines.isEmpty else { throw CGATSParseError.emptyFile }
 
         // Wrap a bare CSV / ISO28178 file in the canonical CGATS block
         // structure so the boundary-based parser below can handle it.

Packages/ICCeryCore/Sources/ICCeryCore/Process/ProcessManager.swift

@@ -559,7 +559,7 @@ public actor ProcessManager {
         // Start a watchdog in case the `readabilityHandler` EOFs never
         // arrive after the process exits (e.g. a hung pipe).
         child.finalizeTask = Task { [weak self] in
-            try? await Task.sleep(for: .seconds(2))
+            try? await Task.sleep(nanoseconds: 2_000_000_000)
             guard let self else { return }
             await self.forceKill(id: id)
             await self.forceFinalize(id: id)

Sources/ICCery/SettingsViewModel.swift

@@ -33,7 +33,7 @@ final class SettingsViewModel {
             sink.applySettings(settings)
             savedFlash = true
             Task {
-                try? await Task.sleep(for: .seconds(1.5))
+                try? await Task.sleep(nanoseconds: 1_500_000_000)
                 savedFlash = false
             }
             return true

Sources/ICCery/WizardViewModel.swift

@@ -201,7 +201,7 @@ final class WizardViewModel {
         self.notice = notice
         if let delay = notice.autoHideAfter {
             noticeDismissTask = Task { [weak self] in
-                try? await Task.sleep(for: .seconds(delay))
+                try? await Task.sleep(nanoseconds: UInt64(delay * 1_000_000_000))
                 guard !Task.isCancelled else { return }
                 if self?.notice?.id == notice.id {
                     self?.notice = nil

Tests/ICCeryCoreTests/AppPathsTests.swift

@@ -1,27 +1,25 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 
-@Suite("AppPaths")
-struct AppPathsTests {
-    @Test func appDataDirUsesBundleID() {
-        #expect(AppPaths.appDataDir.path.contains("Library/Application Support/com.gronod.iccery2"))
+final class AppPathsTests: XCTestCase {
+    func testAppDataDirUsesBundleID() {
+        XCTAssertTrue(AppPaths.appDataDir.path.contains("Library/Application Support/com.gronod.iccery2"))
     }
 
-    @Test func logFileIsUnderLibraryLogs() {
-        #expect(AppPaths.logFile.lastPathComponent == "iccery.log")
-        #expect(AppPaths.logFile.path.contains("Library/Logs/com.gronod.iccery2"))
+    func testLogFileIsUnderLibraryLogs() {
+        XCTAssertEqual(AppPaths.logFile.lastPathComponent, "iccery.log")
+        XCTAssertTrue(AppPaths.logFile.path.contains("Library/Logs/com.gronod.iccery2"))
     }
 
-    @Test func bundledArgyllDirIsInsideResources() {
-        #expect(AppPaths.bundledArgyllDir.lastPathComponent == "Argyll")
+    func testBundledArgyllDirIsInsideResources() {
+        XCTAssertEqual(AppPaths.bundledArgyllDir.lastPathComponent, "Argyll")
     }
 }
 
-@Suite("WizardStage")
-struct WizardStageTests {
-    @Test func stepperOrderIsOneThroughFive() {
-        #expect(WizardStage.stepperStages.map(\.stepperIndex) == [1, 2, 3, 4, 5])
-        #expect(WizardStage.calibrate.stepperIndex == nil)
+final class WizardStageTests: XCTestCase {
+    func testStepperOrderIsOneThroughFive() {
+        XCTAssertEqual(WizardStage.stepperStages.map(\.stepperIndex), [1, 2, 3, 4, 5])
+        XCTAssertNil(WizardStage.calibrate.stepperIndex)
     }
 }

Tests/ICCeryCoreTests/ApplycalArgsTests.swift

@@ -1,22 +1,19 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("ApplycalArgs")
-struct ApplycalArgsTests {
+final class ApplycalArgsTests: XCTestCase {
 
-    @Test("Apply argv")
-    func applyArgv() throws {
+    func testApplyArgv() throws {
         let config = ApplycalConfig(
             calibrationPath: "/tmp/cal.cal",
             inputProfileURL: URL(fileURLWithPath: "/tmp/profile.icc")
         )
         let args = try ApplycalArgs.build(config: config)
-        #expect(args == ["-v", "-a", "/tmp/cal.cal", "/tmp/profile.icc"])
+        XCTAssertEqual(args, ["-v", "-a", "/tmp/cal.cal", "/tmp/profile.icc"])
     }
 
-    @Test("Unapply is emitted when the caller explicitly sets it")
-    func unapplyEmittedWhenConfigSet() throws {
+    func testUnapplyEmittedWhenConfigSet() throws {
         let config = ApplycalConfig(
             calibrationPath: "/tmp/cal.cal",
             inputProfileURL: URL(fileURLWithPath: "/tmp/profile.icc"),
@@ -25,6 +22,6 @@ struct ApplycalArgsTests {
         let args = try ApplycalArgs.build(config: config)
         // Builder emits -u only when the caller explicitly sets unapply.
         // The UI layer never passes unapply: true in v2.0.
-        #expect(args == ["-v", "-u", "/tmp/cal.cal", "/tmp/profile.icc"])
+        XCTAssertEqual(args, ["-v", "-u", "/tmp/cal.cal", "/tmp/profile.icc"])
     }
 }

Tests/ICCeryCoreTests/ArgsBuilderTests.swift

@@ -1,94 +1,80 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 
-@Suite("ArgsBuilder")
-struct ArgsBuilderTests {
+final class ArgsBuilderTests: XCTestCase {
 
     // MARK: - option
 
-    @Test("option: nil emits nothing")
-    func optionNil() {
-        #expect(ArgsBuilder.option("-f", nil) == [])
+    func testOptionNil() {
+        XCTAssertEqual(ArgsBuilder.option("-f", nil), [])
     }
 
-    @Test("option: present value emits flag and value verbatim")
-    func optionPresent() {
-        #expect(ArgsBuilder.option("-f", "abc") == ["-f", "abc"])
-        #expect(ArgsBuilder.option("-f", "") == ["-f", ""])
-        #expect(ArgsBuilder.option("-f", "  padded  ") == ["-f", "  padded  "])
+    func testOptionPresent() {
+        XCTAssertEqual(ArgsBuilder.option("-f", "abc"), ["-f", "abc"])
+        XCTAssertEqual(ArgsBuilder.option("-f", ""), ["-f", ""])
+        XCTAssertEqual(ArgsBuilder.option("-f", "  padded  "), ["-f", "  padded  "])
     }
 
     // MARK: - optionIfNonEmpty
 
-    @Test("optionIfNonEmpty: nil and empty emit nothing")
-    func optionIfNonEmptyNilEmpty() {
-        #expect(ArgsBuilder.optionIfNonEmpty("-d", nil) == [])
-        #expect(ArgsBuilder.optionIfNonEmpty("-d", "") == [])
+    func testOptionIfNonEmptyNilEmpty() {
+        XCTAssertEqual(ArgsBuilder.optionIfNonEmpty("-d", nil), [])
+        XCTAssertEqual(ArgsBuilder.optionIfNonEmpty("-d", ""), [])
     }
 
-    @Test("optionIfNonEmpty: whitespace-only emits nothing")
-    func optionIfNonEmptyWhitespace() {
-        #expect(ArgsBuilder.optionIfNonEmpty("-d", "   ") == [])
-        #expect(ArgsBuilder.optionIfNonEmpty("-d", " \t\n ") == [])
+    func testOptionIfNonEmptyWhitespace() {
+        XCTAssertEqual(ArgsBuilder.optionIfNonEmpty("-d", "   "), [])
+        XCTAssertEqual(ArgsBuilder.optionIfNonEmpty("-d", " \t\n "), [])
     }
 
-    @Test("optionIfNonEmpty: trims surrounding whitespace")
-    func optionIfNonEmptyTrims() {
-        #expect(ArgsBuilder.optionIfNonEmpty("-d", "  label  ") == ["-d", "label"])
-        #expect(ArgsBuilder.optionIfNonEmpty("-d", "\tcal.cal\n") == ["-d", "cal.cal"])
+    func testOptionIfNonEmptyTrims() {
+        XCTAssertEqual(ArgsBuilder.optionIfNonEmpty("-d", "  label  "), ["-d", "label"])
+        XCTAssertEqual(ArgsBuilder.optionIfNonEmpty("-d", "\tcal.cal\n"), ["-d", "cal.cal"])
     }
 
     // MARK: - optionUnlessApprox
 
-    @Test("optionUnlessApprox: nil emits nothing")
-    func optionUnlessApproxNil() {
-        #expect(ArgsBuilder.optionUnlessApprox("-N", nil, skip: 0.50) == [])
+    func testOptionUnlessApproxNil() {
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-N", nil, skip: 0.50), [])
     }
 
-    @Test("optionUnlessApprox: exact skip value emits nothing")
-    func optionUnlessApproxExactSkip() {
-        #expect(ArgsBuilder.optionUnlessApprox("-N", 0.50, skip: 0.50) == [])
-        #expect(ArgsBuilder.optionUnlessApprox("-V", 1.0, skip: 1.0) == [])
+    func testOptionUnlessApproxExactSkip() {
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-N", 0.50, skip: 0.50), [])
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-V", 1.0, skip: 1.0), [])
     }
 
-    @Test("optionUnlessApprox: within epsilon emits nothing")
-    func optionUnlessApproxWithinEpsilon() {
-        #expect(ArgsBuilder.optionUnlessApprox("-N", 0.5005, skip: 0.50) == [])
-        #expect(ArgsBuilder.optionUnlessApprox("-V", 0.9995, skip: 1.0) == [])
+    func testOptionUnlessApproxWithinEpsilon() {
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-N", 0.5005, skip: 0.50), [])
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-V", 0.9995, skip: 1.0), [])
     }
 
-    @Test("optionUnlessApprox: outside epsilon emits flag")
-    func optionUnlessApproxOutsideEpsilon() {
-        #expect(ArgsBuilder.optionUnlessApprox("-N", 0.75, skip: 0.50) == ["-N", "0.75"])
-        #expect(ArgsBuilder.optionUnlessApprox("-V", 1.50, skip: 1.0) == ["-V", "1.50"])
-        #expect(ArgsBuilder.optionUnlessApprox("-N", 0.498, skip: 0.50) == ["-N", "0.50"])
+    func testOptionUnlessApproxOutsideEpsilon() {
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-N", 0.75, skip: 0.50), ["-N", "0.75"])
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-V", 1.50, skip: 1.0), ["-V", "1.50"])
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-N", 0.498, skip: 0.50), ["-N", "0.50"])
     }
 
-    @Test("optionUnlessApprox: POSIX formatting is locale-stable")
-    func optionUnlessApproxPOSIX() {
+    func testOptionUnlessApproxPOSIX() {
         // 1234.5 must never produce a grouping separator or comma decimal.
-        #expect(ArgsBuilder.optionUnlessApprox("-p", 1234.5, skip: 1.0) == ["-p", "1234.50"])
-        #expect(ArgsBuilder.optionUnlessApprox("-p", 2.0, skip: 1.0) == ["-p", "2.00"])
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-p", 1234.5, skip: 1.0), ["-p", "1234.50"])
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-p", 2.0, skip: 1.0), ["-p", "2.00"])
     }
 
-    @Test("optionUnlessApprox: custom epsilon and format honoured")
-    func optionUnlessApproxCustom() {
-        #expect(ArgsBuilder.optionUnlessApprox("-x", 1.005, skip: 1.0, epsilon: 0.01) == [])
-        #expect(ArgsBuilder.optionUnlessApprox("-x", 1.5, skip: 1.0, format: "%.1f") == ["-x", "1.5"])
+    func testOptionUnlessApproxCustom() {
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-x", 1.005, skip: 1.0, epsilon: 0.01), [])
+        XCTAssertEqual(ArgsBuilder.optionUnlessApprox("-x", 1.5, skip: 1.0, format: "%.1f"), ["-x", "1.5"])
     }
 
     // MARK: - flag
 
-    @Test("flag: true emits the bare flag")
-    func flagTrue() {
-        #expect(ArgsBuilder.flag("-G", when: true) == ["-G"])
-        #expect(ArgsBuilder.flag("-r", when: true) == ["-r"])
+    func testFlagTrue() {
+        XCTAssertEqual(ArgsBuilder.flag("-G", when: true), ["-G"])
+        XCTAssertEqual(ArgsBuilder.flag("-r", when: true), ["-r"])
     }
 
-    @Test("flag: false emits nothing")
-    func flagFalse() {
-        #expect(ArgsBuilder.flag("-G", when: false) == [])
-        #expect(ArgsBuilder.flag("-r", when: false) == [])
+    func testFlagFalse() {
+        XCTAssertEqual(ArgsBuilder.flag("-G", when: false), [])
+        XCTAssertEqual(ArgsBuilder.flag("-r", when: false), [])
     }
 }

Tests/ICCeryCoreTests/ArgyllRunnerCalibrationTests.swift

@@ -1,9 +1,8 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("ArgyllRunner Calibration")
-struct ArgyllRunnerCalibrationTests {
+final class ArgyllRunnerCalibrationTests: XCTestCase {
 
     private func makeRunner(processManager: ProcessManager = ProcessManager()) -> ArgyllRunner {
         let binDir = URL(fileURLWithPath: #filePath)
@@ -23,8 +22,7 @@ struct ArgyllRunnerCalibrationTests {
         return root
     }
 
-    @Test("Calibration targen produces CAL_*.ti1")
-    func calibrationTargenProducesTi1() async throws {
+    func testCalibrationTargenProducesTi1() async throws {
         let testRoot = try makeTestDir()
         let runner = makeRunner()
         let config = CalibrationTargenConfig(
@@ -36,13 +34,12 @@ struct ArgyllRunnerCalibrationTests {
 
         let url = try await runner.runCalibrationTargen(config: config)
 
-        #expect(url.lastPathComponent == "CAL_demo.ti1")
-        #expect(FileManager.default.fileExists(atPath: url.path))
+        XCTAssertEqual(url.lastPathComponent, "CAL_demo.ti1")
+        XCTAssertTrue(FileManager.default.fileExists(atPath: url.path))
         try? FileManager.default.removeItem(at: testRoot)
     }
 
-    @Test("Calibration targen from foo runs as process id targen_CAL_foo")
-    func calibrationTargenProcessId() async throws {
+    func testCalibrationTargenProcessId() async throws {
         let testRoot = try makeTestDir()
         let pm = ProcessManager()
         let runner = makeRunner(processManager: pm)
@@ -65,13 +62,13 @@ struct ArgyllRunnerCalibrationTests {
 
         let url = try await runner.runCalibrationTargen(config: config)
 
-        #expect(url.lastPathComponent == "CAL_foo.ti1")
-        #expect(await sawExit.value)
+        XCTAssertEqual(url.lastPathComponent, "CAL_foo.ti1")
+        let sawExitEvent = await sawExit.value
+        XCTAssertTrue(sawExitEvent)
         try? FileManager.default.removeItem(at: testRoot)
     }
 
-    @Test("printcal captured run creates .cal")
-    func printcalProducesCal() async throws {
+    func testPrintcalProducesCal() async throws {
         let testRoot = try makeTestDir()
         let runner = makeRunner()
         let output = testRoot.appendingPathComponent("CAL_demo.cal")
@@ -83,13 +80,12 @@ struct ArgyllRunnerCalibrationTests {
 
         let url = try await runner.runPrintcal(config: config)
 
-        #expect(url.lastPathComponent == "CAL_demo.cal")
-        #expect(FileManager.default.fileExists(atPath: url.path))
+        XCTAssertEqual(url.lastPathComponent, "CAL_demo.cal")
+        XCTAssertTrue(FileManager.default.fileExists(atPath: url.path))
         try? FileManager.default.removeItem(at: testRoot)
     }
 
-    @Test("printcal failure throws toolFailed")
-    func printcalFailureThrows() async throws {
+    func testPrintcalFailureThrows() async throws {
         let testRoot = try makeTestDir()
         defer { try? FileManager.default.removeItem(at: testRoot) }
 
@@ -117,9 +113,11 @@ struct ArgyllRunnerCalibrationTests {
             outputURL: output
         )
 
-        await #expect(throws: ArgyllRunnerError.toolFailed(
-            tool: "printcal", code: 1, logs: ["printcal mock failure\n"])) {
+        await assertAsyncThrows(expectedType: ArgyllRunnerError.self) {
             _ = try await runner.runPrintcal(config: config)
+        } errorHandler: { error in
+            XCTAssertEqual(error, .toolFailed(
+                tool: "printcal", code: 1, logs: ["printcal mock failure\n"]))
         }
     }
 }

Tests/ICCeryCoreTests/ArgyllRunnerColprofTests.swift

@@ -1,5 +1,5 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
 final class LogHolder: @unchecked Sendable {
@@ -19,11 +19,9 @@ final class LogHolder: @unchecked Sendable {
     }
 }
 
-@Suite("ArgyllRunner colprof")
-struct ArgyllRunnerColprofTests {
+final class ArgyllRunnerColprofTests: XCTestCase {
 
-    @Test("Mock colprof produces .icc")
-    func colprofProducesIcc() async throws {
+    func testColprofProducesIcc() async throws {
         let binDir = URL(fileURLWithPath: #filePath)
             .deletingLastPathComponent()
             .deletingLastPathComponent()
@@ -43,15 +41,14 @@ struct ArgyllRunnerColprofTests {
             holder.append(batch)
         }
 
-        #expect(url.lastPathComponent == "testrun.icc")
-        #expect(FileManager.default.fileExists(atPath: url.path))
-        #expect(holder.lines.contains { $0.contains("Gamut mapping") })
+        XCTAssertEqual(url.lastPathComponent, "testrun.icc")
+        XCTAssertTrue(FileManager.default.fileExists(atPath: url.path))
+        XCTAssertTrue(holder.lines.contains { $0.contains("Gamut mapping") })
 
         try? FileManager.default.removeItem(at: testRoot)
     }
 
-    @Test("Failing colprof throws toolFailed with code and logs")
-    func colprofFailureThrowsToolFailed() async throws {
+    func testColprofFailureThrowsToolFailed() async throws {
         let dir = FileManager.default.temporaryDirectory
             .appendingPathComponent("colprof-fail-\(UUID().uuidString)")
         try FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
@@ -72,9 +69,11 @@ struct ArgyllRunnerColprofTests {
         )
         let config = ColprofConfig(basename: "failrun", workingDirectory: dir)
 
-        await #expect(throws: ArgyllRunnerError.toolFailed(
-            tool: "colprof", code: 4, logs: ["colprof broke"])) {
+        await assertAsyncThrows(expectedType: ArgyllRunnerError.self) {
             try await runner.runColprof(config: config)
+        } errorHandler: { error in
+            XCTAssertEqual(error, .toolFailed(
+                tool: "colprof", code: 4, logs: ["colprof broke"]))
         }
     }
 }

Tests/ICCeryCoreTests/ArgyllRunnerStreamingLoopTests.swift

@@ -1,5 +1,5 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
 /// Focused contracts for the shared `runStreamingTool` loop (#79).
@@ -7,8 +7,7 @@ import Testing
 /// Every test uses a per-test temporary directory, unique basenames,
 /// and a fresh `ProcessManager` — no shared UI fixture scripts and no
 /// process-environment mutation.
-@Suite("ArgyllRunner streaming loop contracts")
-struct ArgyllRunnerStreamingLoopTests {
+final class ArgyllRunnerStreamingLoopTests: XCTestCase {
 
     private func makeTempDir() throws -> URL {
         let dir = FileManager.default.temporaryDirectory
@@ -30,8 +29,7 @@ struct ArgyllRunnerStreamingLoopTests {
             binaryResolver: BinaryResolver(bundledRoot: binDir, overrideDir: binDir))
     }
 
-    @Test("Non-zero exit throws toolFailed retaining code and collected stdout/stderr lines")
-    func nonZeroExitThrowsToolFailed() async throws {
+    func testNonZeroExitThrowsToolFailed() async throws {
         let dir = try makeTempDir()
         defer { try? FileManager.default.removeItem(at: dir) }
         try writeMock("targen", """
@@ -47,21 +45,20 @@ struct ArgyllRunnerStreamingLoopTests {
 
         do {
             _ = try await runner.runTargen(config: config)
-            Issue.record("Expected toolFailed")
+            XCTFail("Expected toolFailed")
         } catch let error as ArgyllRunnerError {
             guard case .toolFailed(let tool, let code, let logs) = error else {
-                Issue.record("Expected toolFailed, got \(error)")
+                XCTFail("Expected toolFailed, got \(error)")
                 return
             }
-            #expect(tool == "targen")
-            #expect(code == 3)
-            #expect(logs.contains("Generating patches..."))
-            #expect(logs.contains("targen: too few patches"))
+            XCTAssertEqual(tool, "targen")
+            XCTAssertEqual(code, 3)
+            XCTAssertTrue(logs.contains("Generating patches..."))
+            XCTAssertTrue(logs.contains("targen: too few patches"))
         }
     }
 
-    @Test("Exit 0 without expected artefact throws missingArtefact with the artefact path")
-    func zeroExitMissingArtefact() async throws {
+    func testZeroExitMissingArtefact() async throws {
         let dir = try makeTempDir()
         defer { try? FileManager.default.removeItem(at: dir) }
         try writeMock("targen", """
@@ -75,13 +72,14 @@ struct ArgyllRunnerStreamingLoopTests {
             colourSpace: .rgb, patchCount: 800, whitePatches: 4,
             blackPatches: 4, basename: "gone", workingDirectory: dir)
 
-        await #expect(throws: ArgyllRunnerError.missingArtefact(expectedPath)) {
+        await assertAsyncThrows(expectedType: ArgyllRunnerError.self) {
             try await runner.runTargen(config: config)
+        } errorHandler: { error in
+            XCTAssertEqual(error, .missingArtefact(expectedPath))
         }
     }
 
-    @Test("Immediate exit after one stdout line still delivers the line and succeeds")
-    func immediateExitDeliversLine() async throws {
+    func testImmediateExitDeliversLine() async throws {
         let dir = try makeTempDir()
         defer { try? FileManager.default.removeItem(at: dir) }
         try writeMock("targen", """
@@ -101,13 +99,12 @@ struct ArgyllRunnerStreamingLoopTests {
         let url = try await runner.runTargen(config: config) { batch in
             holder.append(batch)
         }
-        #expect(url.lastPathComponent == "quick.ti1")
-        #expect(FileManager.default.fileExists(atPath: url.path))
-        #expect(holder.lines.contains("only line"))
+        XCTAssertEqual(url.lastPathComponent, "quick.ti1")
+        XCTAssertTrue(FileManager.default.fileExists(atPath: url.path))
+        XCTAssertTrue(holder.lines.contains("only line"))
     }
 
-    @Test("colprof unterminated progress fragment reaches onLogBatch before exit")
-    func colprofPartialLineFlush() async throws {
+    func testColprofPartialLineFlush() async throws {
         let dir = try makeTempDir()
         defer { try? FileManager.default.removeItem(at: dir) }
         // The fragment is printed without a newline, then the mock sleeps
@@ -129,13 +126,13 @@ struct ArgyllRunnerStreamingLoopTests {
         let url = try await runner.runColprof(config: config) { batch in
             holder.append(batch)
         }
-        #expect(url.lastPathComponent == "frag.icc")
-        #expect(FileManager.default.fileExists(atPath: url.path))
-        #expect(holder.lines.contains("Doing gamut mapping"))
+        XCTAssertEqual(url.lastPathComponent, "frag.icc")
+        XCTAssertTrue(FileManager.default.fileExists(atPath: url.path))
+        XCTAssertTrue(holder.lines.contains("Doing gamut mapping"))
     }
 
-    @Test("toolFailed maps each tool to its user-facing description",
-          arguments: [
+    func testToolDescriptions() {
+        let cases: [(tool: String, expected: String)] = [
             (tool: "chartread", expected: "Chartread failed: boom"),
             (tool: "average", expected: "Averaging failed: boom"),
             (tool: "colprof", expected: "Profile creation failed: boom"),
@@ -143,19 +140,19 @@ struct ArgyllRunnerStreamingLoopTests {
             (tool: "applycal", expected: "Apply calibration failed: boom"),
             (tool: "iccgamut", expected: "Gamut extraction failed: boom"),
             (tool: "profcheck", expected: "Profile verification failed: boom"),
-          ])
-    func toolDescriptions(tool: String, expected: String) {
+        ]
+        for (tool, expected) in cases {
             let error = ArgyllRunnerError.toolFailed(tool: tool, code: 1, logs: ["boom"])
-        #expect(error.errorDescription == expected)
+            XCTAssertEqual(error.errorDescription, expected)
+        }
     }
 
-    @Test("toolFailed falls back to a generic description for unmapped tools and empty logs")
-    func genericFallbacks() {
+    func testGenericFallbacks() {
         let unknown = ArgyllRunnerError.toolFailed(tool: "targen", code: 7, logs: ["boom"])
-        #expect(unknown.errorDescription == "Process exited with code 7")
+        XCTAssertEqual(unknown.errorDescription, "Process exited with code 7")
 
         let emptyLogs = ArgyllRunnerError.toolFailed(tool: "colprof", code: 2, logs: [])
-        #expect(emptyLogs.errorDescription
-            == "Profile creation failed: exited with code 2")
+        XCTAssertEqual(emptyLogs.errorDescription,
+            "Profile creation failed: exited with code 2")
     }
 }

Tests/ICCeryCoreTests/ArtefactFilesTests.swift

@@ -1,4 +1,4 @@
-import Testing
+import XCTest
 import Foundation
 import ImageIO
 import UniformTypeIdentifiers
@@ -10,9 +10,8 @@ private func tempURL(_ name: String) -> URL {
         .appendingPathComponent(name)
 }
 
-@Suite("Ti2Header")
-struct Ti2HeaderTests {
-    @Test func parsesKeywordsAndSibling() throws {
+final class Ti2HeaderTests: XCTestCase {
+    func testParsesKeywordsAndSibling() throws {
         let dir = FileManager.default.temporaryDirectory
             .appendingPathComponent("iccery-ti2-\(UUID().uuidString)")
         try FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
@@ -31,18 +30,18 @@ struct Ti2HeaderTests {
         )
 
         let h = Ti2Header.parse(dir.appendingPathComponent("job.ti2"))
-        #expect(h.instrument == "i1iO")
-        #expect(h.patchCount == 800)
-        #expect(h.pageCount == 3)
-        #expect(h.hasSiblingTi1)
+        XCTAssertEqual(h.instrument, "i1iO")
+        XCTAssertEqual(h.patchCount, 800)
+        XCTAssertEqual(h.pageCount, 3)
+        XCTAssertTrue(h.hasSiblingTi1)
     }
 
-    @Test func missingFileYieldsEmptyHeader() {
+    func testMissingFileYieldsEmptyHeader() {
         let h = Ti2Header.parse(URL(fileURLWithPath: "/nonexistent/x.ti2"))
-        #expect(h.instrument == nil && h.patchCount == nil && !h.hasSiblingTi1)
+        XCTAssertTrue(h.instrument == nil && h.patchCount == nil && !h.hasSiblingTi1)
     }
 
-    @Test func numberOfFieldsIsNotPatchCount() throws {
+    func testNumberOfFieldsIsNotPatchCount() throws {
         let url = tempURL("t.ti2")
         try FileManager.default.createDirectory(
             at: url.deletingLastPathComponent(), withIntermediateDirectories: true
@@ -50,12 +49,11 @@ struct Ti2HeaderTests {
         try "NUMBER_OF_FIELDS 9\nNUMBER_OF_SETS 52\nBEGIN_DATA\n".write(
             to: url, atomically: true, encoding: .utf8
         )
-        #expect(Ti2Header.parse(url).patchCount == 52)
+        XCTAssertEqual(Ti2Header.parse(url).patchCount, 52)
     }
 }
 
-@Suite("TiffPreview")
-struct TiffPreviewTests {
+final class TiffPreviewTests: XCTestCase {
     /// Builds a real 2000×1000 TIFF in a temp dir via ImageIO.
     private func makeTiff(width: Int = 2000, height: Int = 1000) throws -> URL {
         let url = tempURL("big.tif")
@@ -81,50 +79,48 @@ struct TiffPreviewTests {
         return url
     }
 
-    @Test func producesCappedPNG() throws {
+    func testProducesCappedPNG() throws {
         let tiff = try makeTiff()
         let png = TiffPreview.previewPNG(tiff: tiff)
-        #expect(png != nil)
+        XCTAssertNotNil(png)
         // PNG magic
-        #expect(png!.prefix(8) == Data([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]))
+        XCTAssertEqual(png!.prefix(8), Data([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]))
         // Verify the cap by decoding the thumbnail header.
         let src = CGImageSourceCreateWithData(png! as CFData, nil)!
         let img = CGImageSourceCreateImageAtIndex(src, 0, nil)!
-        #expect(max(img.width, img.height) <= TiffPreview.maxEdge)
-        #expect(img.width == 1200)
+        XCTAssertTrue(max(img.width, img.height) <= TiffPreview.maxEdge)
+        XCTAssertEqual(img.width, 1200)
     }
 
-    @Test func nonTiffReturnsNil() throws {
+    func testNonTiffReturnsNil() throws {
         let url = tempURL("not-tiff.txt")
         try FileManager.default.createDirectory(
             at: url.deletingLastPathComponent(), withIntermediateDirectories: true
         )
         try "hello".write(to: url, atomically: true, encoding: .utf8)
-        #expect(TiffPreview.previewPNG(tiff: url) == nil)
+        XCTAssertNil(TiffPreview.previewPNG(tiff: url))
     }
 }
 
-@Suite("ArtefactFiles")
-struct ArtefactFilesTests {
-    @Test func base64RoundTrip() throws {
+final class ArtefactFilesTests: XCTestCase {
+    func testBase64RoundTrip() throws {
         let url = tempURL("a.txt")
         try FileManager.default.createDirectory(
             at: url.deletingLastPathComponent(), withIntermediateDirectories: true
         )
         try "hello".write(to: url, atomically: true, encoding: .utf8)
         let b64 = try ArtefactFiles.readBase64(url)
-        #expect(Data(base64Encoded: b64) == Data("hello".utf8))
+        XCTAssertEqual(Data(base64Encoded: b64), Data("hello".utf8))
     }
 
-    @Test func defaultWorkingDirExists() {
-        #expect(FileManager.default.fileExists(
+    func testDefaultWorkingDirExists() {
+        XCTAssertTrue(FileManager.default.fileExists(
             atPath: ArtefactFiles.defaultWorkingDirectory().path
         ))
     }
 }
 
-@Suite("ArtefactProbe profile resolve")
-struct ArtefactProbeProfileTests {
+final class ArtefactProbeProfileTests: XCTestCase {
     private func makeDir() throws -> URL {
         let dir = FileManager.default.temporaryDirectory
             .appendingPathComponent("probe-\(UUID().uuidString)")
@@ -134,93 +130,83 @@ struct ArtefactProbeProfileTests {
 
     // MARK: Basename probe matrix (#69)
 
-    @Test("basename probe: only .icc exists")
-    func onlyIcc() throws {
+    func testOnlyIcc() throws {
         let dir = try makeDir()
         let icc = dir.appendingPathComponent("job.icc")
         try Data("icc".utf8).write(to: icc)
-        #expect(ArtefactProbe.resolveProfile(basename: "job", cwd: dir)?.path == icc.path)
+        XCTAssertEqual(ArtefactProbe.resolveProfile(basename: "job", cwd: dir)?.path, icc.path)
     }
 
-    @Test("basename probe: only .icm exists")
-    func onlyIcm() throws {
+    func testOnlyIcm() throws {
         let dir = try makeDir()
         let icm = dir.appendingPathComponent("job.icm")
         try Data("icm".utf8).write(to: icm)
-        #expect(ArtefactProbe.resolveProfile(basename: "job", cwd: dir)?.path == icm.path)
+        XCTAssertEqual(ArtefactProbe.resolveProfile(basename: "job", cwd: dir)?.path, icm.path)
     }
 
-    @Test("basename probe prefers .icm")
-    func icmWins() throws {
+    func testIcmWins() throws {
         let dir = try makeDir()
         try Data("icc".utf8).write(to: dir.appendingPathComponent("job.icc"))
         let icm = dir.appendingPathComponent("job.icm")
         try Data("icm".utf8).write(to: icm)
         let url = ArtefactProbe.resolveProfile(basename: "job", cwd: dir)
-        #expect(url?.path == icm.path)
+        XCTAssertEqual(url?.path, icm.path)
     }
 
-    @Test("basename probe: neither exists returns nil")
-    func neitherExists() throws {
+    func testNeitherExists() throws {
         let dir = try makeDir()
-        #expect(ArtefactProbe.resolveProfile(basename: "job", cwd: dir) == nil)
+        XCTAssertNil(ArtefactProbe.resolveProfile(basename: "job", cwd: dir))
     }
 
     // MARK: Explicit URL matrix (#69 / #83)
 
-    @Test("explicit existing .icc wins even when .icm exists")
-    func explicitIccWins() throws {
+    func testExplicitIccWins() throws {
         let dir = try makeDir()
         let icc = dir.appendingPathComponent("job.icc")
         try Data("icc".utf8).write(to: icc)
         try Data("icm".utf8).write(to: dir.appendingPathComponent("job.icm"))
-        #expect(ArtefactProbe.resolveProfile(icc).path == icc.path)
+        XCTAssertEqual(ArtefactProbe.resolveProfile(icc).path, icc.path)
     }
 
-    @Test("explicit existing .icm wins even when .icc exists")
-    func explicitIcmWins() throws {
+    func testExplicitIcmWins() throws {
         let dir = try makeDir()
         try Data("icc".utf8).write(to: dir.appendingPathComponent("job.icc"))
         let icm = dir.appendingPathComponent("job.icm")
         try Data("icm".utf8).write(to: icm)
-        #expect(ArtefactProbe.resolveProfile(icm).path == icm.path)
+        XCTAssertEqual(ArtefactProbe.resolveProfile(icm).path, icm.path)
     }
 
-    @Test("explicit missing .icc flips to sibling .icm")
-    func flipExtension() throws {
+    func testFlipExtension() throws {
         let dir = try makeDir()
         let icc = dir.appendingPathComponent("job.icc")
         let icm = dir.appendingPathComponent("job.icm")
         try Data("icm".utf8).write(to: icm)
         let resolved = ArtefactProbe.resolveProfile(icc)
-        #expect(resolved.path == icm.path)
+        XCTAssertEqual(resolved.path, icm.path)
     }
 
-    @Test("explicit missing .icm flips to sibling .icc")
-    func flipToIcc() throws {
+    func testFlipToIcc() throws {
         let dir = try makeDir()
         let icc = dir.appendingPathComponent("job.icc")
         let icm = dir.appendingPathComponent("job.icm")
         try Data("icc".utf8).write(to: icc)
-        #expect(ArtefactProbe.resolveProfile(icm).path == icc.path)
+        XCTAssertEqual(ArtefactProbe.resolveProfile(icm).path, icc.path)
     }
 
-    @Test("explicit missing both returns the original URL")
-    func missingBoth() throws {
+    func testMissingBoth() throws {
         let dir = try makeDir()
         let icc = dir.appendingPathComponent("job.icc")
-        #expect(ArtefactProbe.resolveProfile(icc).path == icc.path)
+        XCTAssertEqual(ArtefactProbe.resolveProfile(icc).path, icc.path)
     }
 
-    @Test("unrelated extension is never rewritten")
-    func unrelatedExtension() throws {
+    func testUnrelatedExtension() throws {
         let dir = try makeDir()
         let mpp = dir.appendingPathComponent("job.mpp")
         let icc = dir.appendingPathComponent("job.icc")
         try Data("icc".utf8).write(to: icc)
         // Even though a sibling .icc exists, a missing .mpp stays .mpp.
-        #expect(ArtefactProbe.resolveProfile(mpp).path == mpp.path)
+        XCTAssertEqual(ArtefactProbe.resolveProfile(mpp).path, mpp.path)
         let txt = dir.appendingPathComponent("job.txt")
-        #expect(ArtefactProbe.resolveProfile(txt).path == txt.path)
+        XCTAssertEqual(ArtefactProbe.resolveProfile(txt).path, txt.path)
     }
 }

Tests/ICCeryCoreTests/BinaryResolverTests.swift

@@ -1,9 +1,8 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 
-@Suite("BinaryResolver")
-struct BinaryResolverTests {
+final class BinaryResolverTests: XCTestCase {
 
     private func makeTree(_ body: (URL) throws -> Void) throws -> URL {
         let root = FileManager.default.temporaryDirectory
@@ -22,16 +21,16 @@ struct BinaryResolverTests {
         }
     }
 
-    @Test func overrideDirWinsWhenFileExists() throws {
+    func testOverrideDirWinsWhenFileExists() throws {
         let override = try makeTree { root in
             try touch(root.appendingPathComponent("targen"))
         }
         let bundled = try makeTree { _ in }
         let r = BinaryResolver(bundledRoot: bundled, overrideDir: override)
-        #expect(r.resolve("targen") == override.appendingPathComponent("targen"))
+        XCTAssertEqual(r.resolve("targen"), override.appendingPathComponent("targen"))
     }
 
-    @Test func overrideFallsThroughWhenMissing() throws {
+    func testOverrideFallsThroughWhenMissing() throws {
         let override = try makeTree { _ in }
         let bundled = try makeTree { root in
             let dir = root.appendingPathComponent("macos-universal")
@@ -39,10 +38,10 @@ struct BinaryResolverTests {
             try touch(dir.appendingPathComponent("instlist"))
         }
         let r = BinaryResolver(bundledRoot: bundled, overrideDir: override)
-        #expect(r.resolve("targen").path.contains("macos-universal/targen"))
+        XCTAssertTrue(r.resolve("targen").path.contains("macos-universal/targen"))
     }
 
-    @Test func universalPreferredWhenMarkerPresent() throws {
+    func testUniversalPreferredWhenMarkerPresent() throws {
         let bundled = try makeTree { root in
             for dir in ["macos-universal", "macos-x86_64"] {
                 let d = root.appendingPathComponent(dir)
@@ -51,10 +50,10 @@ struct BinaryResolverTests {
             }
         }
         let r = BinaryResolver(bundledRoot: bundled)
-        #expect(r.platformDir() == "macos-universal")
+        XCTAssertEqual(r.platformDir(), "macos-universal")
     }
 
-    @Test func fallsBackToArchDir() throws {
+    func testFallsBackToArchDir() throws {
         let bundled = try makeTree { root in
             let d = root.appendingPathComponent("macos-x86_64")
             try FileManager.default.createDirectory(at: d, withIntermediateDirectories: true)
@@ -64,20 +63,20 @@ struct BinaryResolverTests {
             bundledRoot: bundled,
             archDirs: ["macos-universal", "macos-x86_64"]
         )
-        #expect(r.platformDir() == "macos-x86_64")
+        XCTAssertEqual(r.platformDir(), "macos-x86_64")
     }
 
-    @Test func missingEverythingReturnsConstructedPath() throws {
+    func testMissingEverythingReturnsConstructedPath() throws {
         let bundled = try makeTree { _ in }
         let r = BinaryResolver(bundledRoot: bundled)
         // v1 semantic: path is returned; spawn surfaces the error.
-        #expect(r.resolve("targen").path.hasSuffix("macos-universal/targen"))
-        #expect(!r.exists(r.resolve("targen")))
+        XCTAssertTrue(r.resolve("targen").path.hasSuffix("macos-universal/targen"))
+        XCTAssertFalse(r.exists(r.resolve("targen")))
     }
 
-    @Test func mockAndGamutPaths() throws {
+    func testMockAndGamutPaths() throws {
         let r = BinaryResolver(bundledRoot: URL(fileURLWithPath: "/x"))
-        #expect(r.mock("chartread").path == "/x/mocks/chartread.mock")
-        #expect(r.referenceGamut("sRGB.gam").path == "/x/reference_gamuts/sRGB.gam")
+        XCTAssertEqual(r.mock("chartread").path, "/x/mocks/chartread.mock")
+        XCTAssertEqual(r.referenceGamut("sRGB.gam").path, "/x/reference_gamuts/sRGB.gam")
     }
 }

Tests/ICCeryCoreTests/CGATSParserTests.swift

@@ -1,9 +1,8 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("CGATS Parser & Writer")
-struct CGATSParserTests {
+final class CGATSParserTests: XCTestCase {
 
     private static let canonicalCTI3 = """
     CTI3
@@ -21,44 +20,40 @@ struct CGATSParserTests {
     END_DATA
     """
 
-    @Test("Parses CTI3 with canonical field names")
-    func parseCTI3() throws {
+    func testParseCTI3() throws {
         let dataset = try CGATSParser.parse(Self.canonicalCTI3)
-        #expect(dataset.format == .cti3)
-        #expect(dataset.samples.count == 2)
-        #expect(dataset.colorRep == "RGB")
-        #expect(dataset.deviceClass == "DISPLAY")
-        #expect(dataset.samples[0].id == "1")
-        #expect(dataset.samples[0].loc == "A1")
-        #expect(dataset.samples[1].values["RGB_G"] == "50.0000")
+        XCTAssertEqual(dataset.format, .cti3)
+        XCTAssertEqual(dataset.samples.count, 2)
+        XCTAssertEqual(dataset.colorRep, "RGB")
+        XCTAssertEqual(dataset.deviceClass, "DISPLAY")
+        XCTAssertEqual(dataset.samples[0].id, "1")
+        XCTAssertEqual(dataset.samples[0].loc, "A1")
+        XCTAssertEqual(dataset.samples[1].values["RGB_G"], "50.0000")
     }
 
-    @Test("Round-trips parse, write, reparse")
-    func roundTrip() throws {
+    func testRoundTrip() throws {
         let first = try CGATSParser.parse(Self.canonicalCTI3)
         let text = try CGATSWriter.write(first)
         let second = try CGATSParser.parse(text)
-        #expect(second.format == first.format)
-        #expect(second.samples.count == first.samples.count)
-        #expect(second.colorRep == first.colorRep)
-        #expect(second.deviceClass == first.deviceClass)
+        XCTAssertEqual(second.format, first.format)
+        XCTAssertEqual(second.samples.count, first.samples.count)
+        XCTAssertEqual(second.colorRep, first.colorRep)
+        XCTAssertEqual(second.deviceClass, first.deviceClass)
     }
 
-    @Test("Parses CSV with comma delimiters")
-    func parseCSV() throws {
+    func testParseCSV() throws {
         let csv = """
         SAMPLE_ID,SAMPLE_LOC,RGB_R,RGB_G,RGB_B,XYZ_X,XYZ_Y,XYZ_Z,LAB_L,LAB_A,LAB_B
         1,A1,50,0,0,20,10,5,50,60,30
         2,A2,0,50,0,10,30,5,60,-50,40
         """
         let dataset = try CGATSParser.parse(csv, sourceURL: URL(fileURLWithPath: "/tmp/sample.csv"))
-        #expect(dataset.format == .csv)
-        #expect(dataset.samples.count == 2)
-        #expect(dataset.samples[0].values["RGB_R"] == "50.0000")
+        XCTAssertEqual(dataset.format, .csv)
+        XCTAssertEqual(dataset.samples.count, 2)
+        XCTAssertEqual(dataset.samples[0].values["RGB_R"], "50.0000")
     }
 
-    @Test("Converts 0-255 device values to 0-100")
-    func converts255To100() throws {
+    func testConverts255To100() throws {
         let rgb = """
         CTI3
         COLOR_REP RGB
@@ -72,12 +67,11 @@ struct CGATSParserTests {
         END_DATA
         """
         let dataset = try CGATSParser.parse(rgb)
-        #expect(dataset.samples[0].values["RGB_R"] == "100.0000")
-        #expect(dataset.samples[0].values["RGB_G"] == "50.1961")
+        XCTAssertEqual(dataset.samples[0].values["RGB_R"], "100.0000")
+        XCTAssertEqual(dataset.samples[0].values["RGB_G"], "50.1961")
     }
 
-    @Test("Synthesizes COLOR_REP and DEVICE_CLASS when missing")
-    func synthesizesMetadata() throws {
+    func testSynthesizesMetadata() throws {
         let cmyk = """
         CTI3
         NUMBER_OF_FIELDS 6
@@ -90,19 +84,15 @@ struct CGATSParserTests {
         END_DATA
         """
         let dataset = try CGATSParser.parse(cmyk)
-        #expect(dataset.colorRep == "CMYK")
-        #expect(dataset.deviceClass == "PRINTER")
+        XCTAssertEqual(dataset.colorRep, "CMYK")
+        XCTAssertEqual(dataset.deviceClass, "PRINTER")
     }
 
-    @Test("Rejects empty file")
-    func rejectsEmpty() {
-        #expect(throws: (any Error).self) {
-            _ = try CGATSParser.parse("")
-        }
+    func testRejectsEmpty() {
+        XCTAssertThrowsError(try CGATSParser.parse(""))
     }
 
-    @Test("Rejects malformed arity")
-    func rejectsArity() {
+    func testRejectsArity() {
         let bad = """
         CTI3
         NUMBER_OF_FIELDS 2
@@ -114,21 +104,18 @@ struct CGATSParserTests {
         1
         END_DATA
         """
-        #expect(throws: (any Error).self) {
-            _ = try CGATSParser.parse(bad)
-        }
+        XCTAssertThrowsError(try CGATSParser.parse(bad))
     }
 
-    @Test("Writer emits valid .ti3 with tabs and required keywords")
-    func writerFormat() throws {
+    func testWriterFormat() throws {
         let dataset = try CGATSParser.parse(Self.canonicalCTI3)
         let text = try CGATSWriter.write(dataset)
-        #expect(text.contains("CTI3"))
-        #expect(text.contains("BEGIN_DATA_FORMAT"))
-        #expect(text.contains("BEGIN_DATA"))
-        #expect(text.contains("END_DATA"))
-        #expect(text.contains("COLOR_REP"))
-        #expect(text.contains("DEVICE_CLASS"))
-        #expect(text.contains("\t"))
+        XCTAssertTrue(text.contains("CTI3"))
+        XCTAssertTrue(text.contains("BEGIN_DATA_FORMAT"))
+        XCTAssertTrue(text.contains("BEGIN_DATA"))
+        XCTAssertTrue(text.contains("END_DATA"))
+        XCTAssertTrue(text.contains("COLOR_REP"))
+        XCTAssertTrue(text.contains("DEVICE_CLASS"))
+        XCTAssertTrue(text.contains("\t"))
     }
 }

Tests/ICCeryCoreTests/CalibrationIdentityTests.swift

@@ -1,78 +1,67 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
 /// Issue #83 — canonical `CAL_` / original-stem pairing.
-@Suite("CalibrationIdentity")
-struct CalibrationIdentityTests {
-    @Test("live foo, no persisted")
-    func livePlain() {
+final class CalibrationIdentityTests: XCTestCase {
+    func testLivePlain() {
         let id = CalibrationIdentity.parse(liveBasename: "foo", persistedOriginal: "")
-        #expect(id.originalBasename == "foo")
-        #expect(id.calibrationBasename == "CAL_foo")
+        XCTAssertEqual(id.originalBasename, "foo")
+        XCTAssertEqual(id.calibrationBasename, "CAL_foo")
     }
 
-    @Test("live foo ignores stale persisted")
-    func livePlainIgnoresPersisted() {
+    func testLivePlainIgnoresPersisted() {
         let id = CalibrationIdentity.parse(liveBasename: "foo", persistedOriginal: "bar")
-        #expect(id.originalBasename == "foo")
-        #expect(id.calibrationBasename == "CAL_foo")
+        XCTAssertEqual(id.originalBasename, "foo")
+        XCTAssertEqual(id.calibrationBasename, "CAL_foo")
     }
 
-    @Test("live CAL_foo, persisted foo")
-    func liveCalPersisted() {
+    func testLiveCalPersisted() {
         let id = CalibrationIdentity.parse(liveBasename: "CAL_foo", persistedOriginal: "foo")
-        #expect(id.originalBasename == "foo")
-        #expect(id.calibrationBasename == "CAL_foo")
+        XCTAssertEqual(id.originalBasename, "foo")
+        XCTAssertEqual(id.calibrationBasename, "CAL_foo")
     }
 
-    @Test("live CAL_foo, empty persisted strips prefix")
-    func liveCalNoPersist() {
+    func testLiveCalNoPersist() {
         let id = CalibrationIdentity.parse(liveBasename: "CAL_foo", persistedOriginal: "")
-        #expect(id.originalBasename == "foo")
-        #expect(id.calibrationBasename == "CAL_foo")
+        XCTAssertEqual(id.originalBasename, "foo")
+        XCTAssertEqual(id.calibrationBasename, "CAL_foo")
     }
 
-    @Test("persisted original wins over CAL_ live")
-    func persistedWins() {
+    func testPersistedWins() {
         let id = CalibrationIdentity.parse(liveBasename: "CAL_foo", persistedOriginal: "bar")
-        #expect(id.originalBasename == "bar")
-        #expect(id.calibrationBasename == "CAL_bar")
+        XCTAssertEqual(id.originalBasename, "bar")
+        XCTAssertEqual(id.calibrationBasename, "CAL_bar")
     }
 
-    @Test("empty live yields empty identity even with persisted original")
-    func emptyLiveWithPersisted() {
+    func testEmptyLiveWithPersisted() {
         let id = CalibrationIdentity.parse(liveBasename: "", persistedOriginal: "foo")
-        #expect(id.originalBasename.isEmpty)
-        #expect(id.calibrationBasename.isEmpty)
+        XCTAssertTrue(id.originalBasename.isEmpty)
+        XCTAssertTrue(id.calibrationBasename.isEmpty)
     }
 
-    @Test("empty live, empty persisted")
-    func emptyLive() {
+    func testEmptyLive() {
         let id = CalibrationIdentity.parse(liveBasename: "", persistedOriginal: "")
-        #expect(id.originalBasename.isEmpty)
-        #expect(id.calibrationBasename.isEmpty)
+        XCTAssertTrue(id.originalBasename.isEmpty)
+        XCTAssertTrue(id.calibrationBasename.isEmpty)
     }
 
-    @Test("prefix is idempotent on already-prefixed input")
-    func alreadyPrefixed() {
-        #expect(CalibrationIdentity.prefix("CAL_foo") == "CAL_foo")
-        #expect(CalibrationIdentity.prefix("foo") == "CAL_foo")
+    func testAlreadyPrefixed() {
+        XCTAssertEqual(CalibrationIdentity.prefix("CAL_foo"), "CAL_foo")
+        XCTAssertEqual(CalibrationIdentity.prefix("foo"), "CAL_foo")
         let id = CalibrationIdentity.parse(liveBasename: "CAL_CAL_foo", persistedOriginal: "")
-        #expect(id.originalBasename == "CAL_foo")
-        #expect(id.calibrationBasename == "CAL_foo")
+        XCTAssertEqual(id.originalBasename, "CAL_foo")
+        XCTAssertEqual(id.calibrationBasename, "CAL_foo")
     }
 
-    @Test("prefix never invents a name from empty input")
-    func prefixEmpty() {
-        #expect(CalibrationIdentity.prefix("").isEmpty)
-        #expect(CalibrationIdentity.strip("foo") == "foo")
-        #expect(CalibrationIdentity.strip("CAL_foo") == "foo")
+    func testPrefixEmpty() {
+        XCTAssertTrue(CalibrationIdentity.prefix("").isEmpty)
+        XCTAssertEqual(CalibrationIdentity.strip("foo"), "foo")
+        XCTAssertEqual(CalibrationIdentity.strip("CAL_foo"), "foo")
     }
 
-    @Test("runner process id for a calibration targen is targen_CAL_*")
-    func processIdMatches() {
+    func testProcessIdMatches() {
         let cal = CalibrationIdentity.prefix("foo")
-        #expect(ProcessID.targen(cal) == "targen_CAL_foo")
+        XCTAssertEqual(ProcessID.targen(cal), "targen_CAL_foo")
     }
 }

Tests/ICCeryCoreTests/CalibrationStoreTests.swift

@@ -1,9 +1,8 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("CalibrationStore")
-struct CalibrationStoreTests {
+final class CalibrationStoreTests: XCTestCase {
 
     private static let sampleCal = """
     CTI3
@@ -23,8 +22,7 @@ struct CalibrationStoreTests {
     END_DATA
     """
 
-    @Test("Loads metadata and curves from .cal")
-    func parseCal() async throws {
+    func testParseCal() async throws {
         let url = FileManager.default.temporaryDirectory
             .appendingPathComponent("test_\(UUID().uuidString).cal")
         try Self.sampleCal.write(to: url, atomically: true, encoding: .utf8)
@@ -33,17 +31,16 @@ struct CalibrationStoreTests {
         try await store.load(url: url)
 
         let data = await store.data
-        #expect(data?.colorRep == "RGB")
-        #expect(data?.descriptor == "Test printer")
-        #expect(data?.maxTac == 300)
-        #expect(data?.curves.count == 3)
+        XCTAssertEqual(data?.colorRep, "RGB")
+        XCTAssertEqual(data?.descriptor, "Test printer")
+        XCTAssertEqual(data?.maxTac, 300)
+        XCTAssertEqual(data?.curves.count, 3)
 
         let r = data?.curves.first { $0.channel == "R" }
-        #expect(r?.output == [0, 64, 255])
+        XCTAssertEqual(r?.output, [0, 64, 255])
     }
 
-    @Test("Staleness is true for a very old calibration")
-    func staleCalibration() async throws {
+    func testStaleCalibration() async throws {
         let url = FileManager.default.temporaryDirectory
             .appendingPathComponent("stale_\(UUID().uuidString).cal")
         try Self.sampleCal.write(to: url, atomically: true, encoding: .utf8)
@@ -51,11 +48,10 @@ struct CalibrationStoreTests {
         let store = CalibrationStore(staleDays: 0)
         try await store.load(url: url)
         let stale = await store.isStale(comparedTo: "Other")
-        #expect(stale == true)
+        XCTAssertEqual(stale, true)
     }
 
-    @Test("Printer mismatch is flagged as stale")
-    func printerMismatch() async throws {
+    func testPrinterMismatch() async throws {
         let url = FileManager.default.temporaryDirectory
             .appendingPathComponent("mismatch_\(UUID().uuidString).cal")
         try Self.sampleCal.write(to: url, atomically: true, encoding: .utf8)
@@ -64,6 +60,6 @@ struct CalibrationStoreTests {
         try await store.load(url: url)
         await store.setPrinterName("Printer A")
         let stale = await store.isStale(comparedTo: "Printer B")
-        #expect(stale == true)
+        XCTAssertEqual(stale, true)
     }
 }

Tests/ICCeryCoreTests/CalibrationTargenArgsTests.swift

@@ -1,12 +1,10 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("CalibrationTargenArgs")
-struct CalibrationTargenArgsTests {
+final class CalibrationTargenArgsTests: XCTestCase {
 
-    @Test("RGB baseline")
-    func rgbBaseline() throws {
+    func testRgbBaseline() throws {
         let config = CalibrationTargenConfig(
             colourSpace: .rgb,
             steps: 21,
@@ -15,11 +13,10 @@ struct CalibrationTargenArgsTests {
             workingDirectory: URL(fileURLWithPath: "/tmp")
         )
         let args = try CalibrationTargenArgs.build(config: config)
-        #expect(args == ["-v", "-d", "2", "-s", "21", "-g", "21", "-e", "4", "-f", "0", "CAL_demo"])
+        XCTAssertEqual(args, ["-v", "-d", "2", "-s", "21", "-g", "21", "-e", "4", "-f", "0", "CAL_demo"])
     }
 
-    @Test("CMYK baseline with ink limit and neutral emphasis")
-    func cmykWithOptions() throws {
+    func testCmykWithOptions() throws {
         let config = CalibrationTargenConfig(
             colourSpace: .cmyk,
             steps: 25,
@@ -30,33 +27,26 @@ struct CalibrationTargenArgsTests {
             workingDirectory: URL(fileURLWithPath: "/tmp")
         )
         let args = try CalibrationTargenArgs.build(config: config)
-        #expect(args == ["-v", "-d", "4", "-s", "25", "-g", "25", "-e", "4", "-f", "0", "-n", "25", "-l", "320", "CAL_printer"])
+        XCTAssertEqual(args, ["-v", "-d", "4", "-s", "25", "-g", "25", "-e", "4", "-f", "0", "-n", "25", "-l", "320", "CAL_printer"])
     }
 
-    @Test("Rejects out-of-range steps")
-    func rejectsBadSteps() {
+    func testRejectsBadSteps() {
         let config = CalibrationTargenConfig(steps: 5, basename: "demo")
-        #expect(throws: (any Error).self) {
-            _ = try CalibrationTargenArgs.build(config: config)
-        }
+        XCTAssertThrowsError(try CalibrationTargenArgs.build(config: config))
     }
 
-    @Test("Rejects bad CMYK ink limit")
-    func rejectsBadInkLimit() {
+    func testRejectsBadInkLimit() {
         let config = CalibrationTargenConfig(
             colourSpace: .cmyk,
             inkLimit: 500,
             basename: "demo"
         )
-        #expect(throws: (any Error).self) {
-            _ = try CalibrationTargenArgs.build(config: config)
-        }
+        XCTAssertThrowsError(try CalibrationTargenArgs.build(config: config))
     }
 
-    @Test("Does not double-prefix an existing CAL_ basename")
-    func noDoublePrefix() throws {
+    func testNoDoublePrefix() throws {
         let config = CalibrationTargenConfig(basename: "CAL_test")
         let args = try CalibrationTargenArgs.build(config: config)
-        #expect(args.last == "CAL_test")
+        XCTAssertEqual(args.last, "CAL_test")
     }
 }

Tests/ICCeryCoreTests/ColprofArgsTests.swift

@@ -1,72 +1,63 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("ColprofArgs")
-struct ColprofArgsTests {
+final class ColprofArgsTests: XCTestCase {
 
-    @Test("Default algorithm and quality")
-    func defaults() throws {
+    func testDefaults() throws {
         let config = ColprofConfig(basename: "target")
         let args = try ColprofArgs.build(config: config)
-        #expect(args == ["-v", "-a", "l", "-q", "m", "target"])
+        XCTAssertEqual(args, ["-v", "-a", "l", "-q", "m", "target"])
     }
 
-    @Test("FWA bare -f when empty string")
-    func fwaBareFlag() throws {
+    func testFwaBareFlag() throws {
         let config = ColprofConfig(fwa: "", basename: "target")
         let args = try ColprofArgs.build(config: config)
-        #expect(args == ["-v", "-a", "l", "-q", "m", "-f", "target"])
+        XCTAssertEqual(args, ["-v", "-a", "l", "-q", "m", "-f", "target"])
     }
 
-    @Test("FWA D50 and D65 emit -f value")
-    func fwaD50() throws {
+    func testFwaD50() throws {
         let config = ColprofConfig(fwa: "D50", basename: "target")
         let args = try ColprofArgs.build(config: config)
-        #expect(args.contains("-f"))
-        #expect(args.contains("D50"))
-        #expect(args.last == "target")
+        XCTAssertTrue(args.contains("-f"))
+        XCTAssertTrue(args.contains("D50"))
+        XCTAssertEqual(args.last, "target")
     }
 
-    @Test("FWA none is omitted")
-    func fwaNoneOmitted() throws {
+    func testFwaNoneOmitted() throws {
         let config = ColprofConfig(fwa: "none", basename: "target")
         let args = try ColprofArgs.build(config: config)
-        #expect(!args.contains("-f"))
+        XCTAssertFalse(args.contains("-f"))
     }
 
-    @Test("Viewing conditions skip none")
-    func viewingCondNoneSkipped() throws {
+    func testViewingCondNoneSkipped() throws {
         let config = ColprofConfig(
             inputViewingCond: "none",
             outputViewingCond: "mt",
             basename: "target"
         )
         let args = try ColprofArgs.build(config: config)
-        #expect(!args.contains("-c"))
-        #expect(args.contains("-d"))
-        #expect(args.contains("mt"))
+        XCTAssertFalse(args.contains("-c"))
+        XCTAssertTrue(args.contains("-d"))
+        XCTAssertTrue(args.contains("mt"))
     }
 
-    @Test("Description falls back to basename when empty")
-    func descriptionFallback() throws {
+    func testDescriptionFallback() throws {
         let config = ColprofConfig(description: "", basename: "target")
         let args = try ColprofArgs.build(config: config)
-        #expect(!args.contains("-D"))
+        XCTAssertFalse(args.contains("-D"))
     }
 
-    @Test("Copyright only when non-empty")
-    func copyright() throws {
+    func testCopyright() throws {
         let config = ColprofConfig(copyright: "Gronod 2026", basename: "target")
         let args = try ColprofArgs.build(config: config)
-        #expect(args.contains("-C"))
-        #expect(args.contains("Gronod 2026"))
+        XCTAssertTrue(args.contains("-C"))
+        XCTAssertTrue(args.contains("Gronod 2026"))
     }
 
-    @Test("No -u passed")
-    func noProgressJsonFlag() throws {
+    func testNoProgressJsonFlag() throws {
         let config = ColprofConfig(basename: "target")
         let args = try ColprofArgs.build(config: config)
-        #expect(!args.contains("-u"))
+        XCTAssertFalse(args.contains("-u"))
     }
 }

Tests/ICCeryCoreTests/ColprofProgressTests.swift

@@ -1,24 +1,20 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("ColprofProgress")
-struct ColprofProgressTests {
+final class ColprofProgressTests: XCTestCase {
 
-    @Test("Classifies gamut mapping")
-    func gamutMapping() {
-        #expect(ColprofProgressClassifier.classify(line: "Gamut mapping calculation in progress") == .gamutMapping)
+    func testGamutMapping() {
+        XCTAssertEqual(ColprofProgressClassifier.classify(line: "Gamut mapping calculation in progress"), .gamutMapping)
     }
 
-    @Test("Classifies fitting or clut")
-    func fitting() {
-        #expect(ColprofProgressClassifier.classify(line: "Fitting cLUT grid points") == .fittingClut)
-        #expect(ColprofProgressClassifier.classify(line: "clut table") == .fittingClut)
+    func testFitting() {
+        XCTAssertEqual(ColprofProgressClassifier.classify(line: "Fitting cLUT grid points"), .fittingClut)
+        XCTAssertEqual(ColprofProgressClassifier.classify(line: "clut table"), .fittingClut)
     }
 
-    @Test("Classifies writing")
-    func writing() {
-        #expect(ColprofProgressClassifier.classify(line: "Writing ICC profile header") == .writingIcc)
-        #expect(ColprofProgressClassifier.classify(line: "icc profile written") == .writingIcc)
+    func testWriting() {
+        XCTAssertEqual(ColprofProgressClassifier.classify(line: "Writing ICC profile header"), .writingIcc)
+        XCTAssertEqual(ColprofProgressClassifier.classify(line: "icc profile written"), .writingIcc)
     }
 }

Tests/ICCeryCoreTests/CupsOptionsFilterTests.swift

@@ -1,4 +1,4 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 @testable import ICCery
@@ -6,48 +6,42 @@ import AppKit
 import ApplicationServices
 
 /// Issue 14 — PMPrintSettingsToOptions capture filter (docs/11 layer ⑥).
-@Suite("CupsOptionsFilter")
-struct CupsOptionsFilterTests {
+final class CupsOptionsFilterTests: XCTestCase {
 
-    @Test("Drops com.apple.*, collate, copies, job-sheets, AP_* keys")
-    func dropsReserved() {
+    func testDropsReserved() {
         let raw = "AP_ColorMatchingMode=AP_ApplicationColorMatching "
             + "AP.ColorMatchingMode=AP_ApplicationColorMatching "
             + "com.apple.print.JobTicket.PMTotalSidesImaged=0 "
             + "collate=true copies=1 job-sheets=none,none "
             + "pserrorhandler-requested=standard "
             + "MediaType=PhotographicGlossy"
-        #expect(CupsOptionsFilter.filter(raw) == "MediaType=PhotographicGlossy")
+        XCTAssertEqual(CupsOptionsFilter.filter(raw), "MediaType=PhotographicGlossy")
     }
 
-    @Test("Keeps relevant driver keys, order preserved")
-    func keepsRelevant() {
+    func testKeepsRelevant() {
         let raw = "InputSlot=Rear PageSize=A4 CNIJIntent2=4 "
             + "Resolution=600x600dpi Duplex=None"
-        #expect(CupsOptionsFilter.filter(raw) == raw)
+        XCTAssertEqual(CupsOptionsFilter.filter(raw), raw)
     }
 
-    @Test("Permissive: unknown non-com.* keys survive")
-    func keepsUnknown() {
+    func testKeepsUnknown() {
         let raw = "VendorFooBar=baz MediaType=Plain"
-        #expect(CupsOptionsFilter.filter(raw) == raw)
+        XCTAssertEqual(CupsOptionsFilter.filter(raw), raw)
     }
 
-    @Test("Drops empty keys and values")
-    func dropsEmpty() {
+    func testDropsEmpty() {
         let raw = "=noval MediaType= InputSlot=Rear"
         // "MediaType=" has an empty value → dropped; "=noval" empty key.
-        #expect(CupsOptionsFilter.filter(raw) == "InputSlot=Rear")
+        XCTAssertEqual(CupsOptionsFilter.filter(raw), "InputSlot=Rear")
     }
 
-    @Test("extractMediaType prefers MediaType then EPIJ_Medi")
-    func extractMedia() {
-        #expect(CupsParsers.extractMediaType(
-            fromOptionsString: "MediaType=Photo EPIJ_Medi=1") == "Photo")
-        #expect(CupsParsers.extractMediaType(
-            fromOptionsString: "EPIJ_Medi=7") == "7")
-        #expect(CupsParsers.extractMediaType(
-            fromOptionsString: "PageSize=A4") == nil)
+    func testExtractMedia() {
+        XCTAssertEqual(CupsParsers.extractMediaType(
+            fromOptionsString: "MediaType=Photo EPIJ_Medi=1"), "Photo")
+        XCTAssertEqual(CupsParsers.extractMediaType(
+            fromOptionsString: "EPIJ_Medi=7"), "7")
+        XCTAssertNil(CupsParsers.extractMediaType(
+            fromOptionsString: "PageSize=A4"))
     }
 }
 
@@ -55,9 +49,8 @@ struct CupsOptionsFilterTests {
 /// `@convention(c)` closures can't capture, so recording goes through
 /// a file-scope recorder keyed by global state; no private symbols are
 /// touched.
-@Suite("ColorSyncSuppressor")
 @MainActor
-struct ColorSyncSuppressorTests {
+final class ColorSyncSuppressorTests: XCTestCase {
 
     /// Fake PMPrintSession — the injected resolver never dereferences it.
     private var fakeSession: PMPrintSession {
@@ -90,55 +83,50 @@ struct ColorSyncSuppressorTests {
         return s
     }
 
-    @Test("Attempt order: Lock → Mode → NoLock, AP_ prefix first")
-    func attemptOrder() {
+    func testAttemptOrder() {
         Self.recorded = []
         Self.succeeding = nil
         Self.missing = ["PMSessionSetColorMatchingModeLock"]
         let s = makeSuppressor()
-        #expect(s.applySPIMode(to: fakeSession) == false)
+        XCTAssertEqual(s.applySPIMode(to: fakeSession), false)
         // Lock is unresolvable → skipped; the rest plays out in order.
-        #expect(Self.recorded.map { "\($0.0)|\($0.1)" }
-            == ColorMatchingAttempts.attempts
+        XCTAssertEqual(Self.recorded.map { "\($0.0)|\($0.1)" }, ColorMatchingAttempts.attempts
                 .filter { $0.symbol != "PMSessionSetColorMatchingModeLock" }
                 .map { "\($0.symbol)|\($0.mode)" })
     }
 
-    @Test("First zero wins — later symbols/modes not called")
-    func firstZeroWins() {
+    func testFirstZeroWins() {
         Self.recorded = []
         Self.succeeding = ("PMSessionSetColorMatchingModeLock",
                            "AP_ApplicationColorMatching")
         Self.missing = []
         let s = makeSuppressor()
-        #expect(s.applySPIMode(to: fakeSession))
-        #expect(Self.recorded.map { "\($0.0)|\($0.1)" } == [
+        XCTAssertTrue(s.applySPIMode(to: fakeSession))
+        XCTAssertEqual(Self.recorded.map { "\($0.0)|\($0.1)" }, [
             "PMSessionSetColorMatchingModeLock|AP_ApplicationColorMatching",
         ])
     }
 
-    @Test("Mode fallback: AP_ rejected → ApplicationColorMatching tried")
-    func modeFallback() {
+    func testModeFallback() {
         Self.recorded = []
         Self.succeeding = ("PMSessionSetColorMatchingModeLock",
                            "ApplicationColorMatching")
         Self.missing = []
         let s = makeSuppressor()
-        #expect(s.applySPIMode(to: fakeSession))
-        #expect(Self.recorded[0].0 == "PMSessionSetColorMatchingModeLock")
-        #expect(Self.recorded[0].1 == "AP_ApplicationColorMatching")
-        #expect(Self.recorded[1].0 == "PMSessionSetColorMatchingModeLock")
-        #expect(Self.recorded[1].1 == "ApplicationColorMatching")
-        #expect(Self.recorded.count == 2)
+        XCTAssertTrue(s.applySPIMode(to: fakeSession))
+        XCTAssertEqual(Self.recorded[0].0, "PMSessionSetColorMatchingModeLock")
+        XCTAssertEqual(Self.recorded[0].1, "AP_ApplicationColorMatching")
+        XCTAssertEqual(Self.recorded[1].0, "PMSessionSetColorMatchingModeLock")
+        XCTAssertEqual(Self.recorded[1].1, "ApplicationColorMatching")
+        XCTAssertEqual(Self.recorded.count, 2)
     }
 
-    @Test("All symbols missing → false, no calls")
-    func allMissing() {
+    func testAllMissing() {
         Self.recorded = []
         Self.succeeding = nil
         Self.missing = Set(ColorMatchingAttempts.symbols)
         let s = makeSuppressor()
-        #expect(s.applySPIMode(to: fakeSession) == false)
-        #expect(Self.recorded.isEmpty)
+        XCTAssertEqual(s.applySPIMode(to: fakeSession), false)
+        XCTAssertTrue(Self.recorded.isEmpty)
     }
 }

Tests/ICCeryCoreTests/CupsParserTests.swift

@@ -1,11 +1,10 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 
 /// Issue 12 — CUPS enumeration parsers on recorded fixtures
 /// (docs/10–11). No live `lpstat`/`lpoptions` is spawned here.
-@Suite("CupsParsers")
-struct CupsParsersTests {
+final class CupsParsersTests: XCTestCase {
 
     // Recorded on an Epson XP-55 + Canon Pro9500 host.
     private let lpstatE = """
@@ -34,112 +33,102 @@ struct CupsParsersTests {
         cupsPrintQuality/cupsPrintQuality: Draft *Normal High
         """
 
-    @Test("lpstat -e: one destination per line; empty = success")
-    func destinations() {
-        #expect(CupsParsers.lpstatDestinations(lpstatE) == [
+    func testDestinations() {
+        XCTAssertEqual(CupsParsers.lpstatDestinations(lpstatE), [
             "Canon_Pro9500_II_series_XPS",
             "Epson_XP_55_LPD",
             "EPSON_XP_55_Series",
         ])
-        #expect(CupsParsers.lpstatDestinations("") == [])
+        XCTAssertEqual(CupsParsers.lpstatDestinations(""), [])
     }
 
-    @Test("lpstat -p: idle / now-printing / disabled statuses")
-    func statuses() {
+    func testStatuses() {
         let s = CupsParsers.lpstatStatuses(lpstatP)
-        #expect(s["Canon_Pro9500_II_series_XPS"] == .idle)
-        #expect(s["Epson_XP_55_LPD"] == .printing)
-        #expect(s["EPSON_XP_55_Series"] == .stopped)
+        XCTAssertEqual(s["Canon_Pro9500_II_series_XPS"], .idle)
+        XCTAssertEqual(s["Epson_XP_55_LPD"], .printing)
+        XCTAssertEqual(s["EPSON_XP_55_Series"], .stopped)
     }
 
-    @Test("lpstat -d: default destination or none")
-    func defaultDestination() {
-        #expect(CupsParsers.lpstatDefault(
-            "system default destination: Canon_Pro9500_II_series_XPS\n")
-            == "Canon_Pro9500_II_series_XPS")
-        #expect(CupsParsers.lpstatDefault("no system default destination\n") == nil)
+    func testDefaultDestination() {
+        XCTAssertEqual(CupsParsers.lpstatDefault(
+            "system default destination: Canon_Pro9500_II_series_XPS\n"), "Canon_Pro9500_II_series_XPS")
+        XCTAssertNil(CupsParsers.lpstatDefault("no system default destination\n"))
     }
 
-    @Test("lpoptions -p: quoted printer-info, bare flags ignored")
-    func displayName() {
-        #expect(CupsParsers.lpoptionsDisplayName(lpoptionsP) == "EPSON XP-55 Series")
-        #expect(CupsParsers.lpoptionsDisplayName("printer-type=42\n") == nil)
+    func testDisplayName() {
+        XCTAssertEqual(CupsParsers.lpoptionsDisplayName(lpoptionsP), "EPSON XP-55 Series")
+        XCTAssertNil(CupsParsers.lpoptionsDisplayName("printer-type=42\n"))
     }
 
-    @Test("lpoptions -l: key/label split, * marks the default")
-    func optionListings() {
+    func testOptionListings() {
         let listings = CupsParsers.lpoptionsList(lpoptionsL)
-        #expect(listings.count == 6)
+        XCTAssertEqual(listings.count, 6)
 
         let page = listings[0]
-        #expect(page.key == "PageSize")
-        #expect(page.label == "Media Size")
-        #expect(page.defaultChoice == "A4")
-        #expect(page.choices.contains("Custom.WIDTHxHEIGHT"))
-        #expect(!page.choices.contains("*A4"))
+        XCTAssertEqual(page.key, "PageSize")
+        XCTAssertEqual(page.label, "Media Size")
+        XCTAssertEqual(page.defaultChoice, "A4")
+        XCTAssertTrue(page.choices.contains("Custom.WIDTHxHEIGHT"))
+        XCTAssertFalse(page.choices.contains("*A4"))
 
         let slot = listings[1]
-        #expect(slot.key == "InputSlot")
-        #expect(slot.choices == ["Auto", "Main", "Photo", "Rear"])
-        #expect(slot.defaultChoice == "Main")
+        XCTAssertEqual(slot.key, "InputSlot")
+        XCTAssertEqual(slot.choices, ["Auto", "Main", "Photo", "Rear"])
+        XCTAssertEqual(slot.defaultChoice, "Main")
     }
 
-    @Test("capabilities: trays/sizes index 1-based, media uses detected key")
-    func capabilities() {
+    func testCapabilities() {
         let service = CupsService()
         let listings = CupsParsers.lpoptionsList(lpoptionsL)
         let caps = service.capabilities(from: listings, ppd: nil)
 
-        #expect(caps.trays == [
+        XCTAssertEqual(caps.trays, [
             PrinterTray(id: 1, name: "Auto"),
             PrinterTray(id: 2, name: "Main"),
             PrinterTray(id: 3, name: "Photo"),
             PrinterTray(id: 4, name: "Rear"),
         ])
-        #expect(caps.paperSizes.first == PrinterPaperSize(id: 1, name: "3.5x5"))
-        #expect(caps.paperSizes.count == 10)
-        #expect(caps.mediaTypes.map(\.id) == [
+        XCTAssertEqual(caps.paperSizes.first, PrinterPaperSize(id: 1, name: "3.5x5"))
+        XCTAssertEqual(caps.paperSizes.count, 10)
+        XCTAssertEqual(caps.mediaTypes.map(\.id), [
             "Stationery", "PhotographicHighGloss", "Photographic",
             "PhotographicMatte", "Envelope",
         ])
-        #expect(caps.supportsOrientation)
+        XCTAssertTrue(caps.supportsOrientation)
     }
 
-    @Test("PPD enrichment maps id → human label")
-    func ppdLabels() {
+    func testPpdLabels() {
         let ppd = """
             *CNIJMediaType 42/Photo Paper Plus Semi-gloss: "<</MediaType(42)>>"
             *CNIJMediaType 0/Plain Paper: ""
             *en_US.CNIJMediaType 13/Envelope: ""
             """
         let labels = CupsParsers.ppdChoiceLabels(ppd, key: "CNIJMediaType")
-        #expect(labels["42"] == "Photo Paper Plus Semi-gloss")
-        #expect(labels["0"] == "Plain Paper")
-        #expect(labels["13"] == "Envelope")
+        XCTAssertEqual(labels["42"], "Photo Paper Plus Semi-gloss")
+        XCTAssertEqual(labels["0"], "Plain Paper")
+        XCTAssertEqual(labels["13"], "Envelope")
     }
 
-    @Test("detectMediaTypeKey prefers vendor keys in order")
-    func mediaTypeKey() {
-        #expect(CupsParsers.detectMediaTypeKey(
-            optionKeys: ["MediaType", "CNIJMediaType"]) == "CNIJMediaType")
-        #expect(CupsParsers.detectMediaTypeKey(
-            optionKeys: ["PageSize", "MediaType"]) == "MediaType")
-        #expect(CupsParsers.detectMediaTypeKey(optionKeys: ["PageSize"]) == nil)
+    func testMediaTypeKey() {
+        XCTAssertEqual(CupsParsers.detectMediaTypeKey(
+            optionKeys: ["MediaType", "CNIJMediaType"]), "CNIJMediaType")
+        XCTAssertEqual(CupsParsers.detectMediaTypeKey(
+            optionKeys: ["PageSize", "MediaType"]), "MediaType")
+        XCTAssertNil(CupsParsers.detectMediaTypeKey(optionKeys: ["PageSize"]))
     }
 
-    @Test("Driver bypass: Canon Intent2 > Intent; Epson CCor > CMat")
-    func driverBypass() {
+    func testDriverBypass() {
         func pair(_ keys: Set<String>) -> String? {
             CupsParsers.detectDriverColorBypass(optionKeys: keys)
                 .map { "\($0.key)=\($0.value)" }
         }
-        #expect(pair(["CNIJIntent2", "CNIJIntent"]) == "CNIJIntent2=4")
-        #expect(pair(["CNIJIntent"]) == "CNIJIntent=4")
-        #expect(pair(["EPIJ_CCor", "EPIJ_CMat"]) == "EPIJ_CCor=0")
-        #expect(pair(["EPIJ_CMat"]) == "EPIJ_CMat=3")
-        #expect(pair(["StpColorCorrection"]) == "StpColorCorrection=Uncorrected")
-        #expect(pair(["ColorCorrection"]) == "ColorCorrection=Uncorrected")
-        #expect(pair(["EpsonColorMode"]) == "EpsonColorMode=Off")
-        #expect(pair(["PageSize"]) == nil)
+        XCTAssertEqual(pair(["CNIJIntent2", "CNIJIntent"]), "CNIJIntent2=4")
+        XCTAssertEqual(pair(["CNIJIntent"]), "CNIJIntent=4")
+        XCTAssertEqual(pair(["EPIJ_CCor", "EPIJ_CMat"]), "EPIJ_CCor=0")
+        XCTAssertEqual(pair(["EPIJ_CMat"]), "EPIJ_CMat=3")
+        XCTAssertEqual(pair(["StpColorCorrection"]), "StpColorCorrection=Uncorrected")
+        XCTAssertEqual(pair(["ColorCorrection"]), "ColorCorrection=Uncorrected")
+        XCTAssertEqual(pair(["EpsonColorMode"]), "EpsonColorMode=Off")
+        XCTAssertNil(pair(["PageSize"]))
     }
 }

Tests/ICCeryCoreTests/DriftAlertTests.swift

@@ -1,65 +1,57 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("DriftAlert")
-struct DriftAlertTests {
+final class DriftAlertTests: XCTestCase {
 
-    @Test("No alert with fewer than two poor results")
-    func notEnough() {
+    func testNotEnough() {
         let records = [
             record(avg: 4.0, at: 1000)
         ]
-        #expect(DriftAlert.compute(from: records) == nil)
+        XCTAssertNil(DriftAlert.compute(from: records))
     }
 
-    @Test("Alert on two poor results one hour apart")
-    func oneHourApart() {
+    func testOneHourApart() {
         let records = [
             record(avg: 4.0, at: 1000),
             record(avg: 5.0, at: 4600)
         ]
-        #expect(DriftAlert.compute(from: records) != nil)
+        XCTAssertNotNil(DriftAlert.compute(from: records))
     }
 
-    @Test("No alert if same day and under one hour")
-    func sameDayUnderHour() {
+    func testSameDayUnderHour() {
         let records = [
             record(avg: 4.0, at: 1000),
             record(avg: 5.0, at: 2000)
         ]
-        #expect(DriftAlert.compute(from: records) == nil)
+        XCTAssertNil(DriftAlert.compute(from: records))
     }
 
-    @Test("Alert on distinct days")
-    func distinctDays() {
+    func testDistinctDays() {
         let day1 = record(avg: 4.0, at: 0)
         let day2 = record(avg: 5.0, at: 86400 + 1000)
-        #expect(DriftAlert.compute(from: [day1, day2]) != nil)
+        XCTAssertNotNil(DriftAlert.compute(from: [day1, day2]))
     }
 
-    @Test("Non-poor records do not trigger")
-    func nonPoor() {
+    func testNonPoor() {
         let records = [
             record(avg: 1.0, at: 0),
             record(avg: 1.5, at: 86400)
         ]
-        #expect(DriftAlert.compute(from: records) == nil)
+        XCTAssertNil(DriftAlert.compute(from: records))
     }
 
-    @Test("Non-poor records break the consecutive poor run")
-    func nonPoorBreaksRun() {
+    func testNonPoorBreaksRun() {
         let records = [
             record(avg: 4.0, at: 0),      // poor
             record(avg: 4.5, at: 86400),  // poor, far apart
             record(avg: 1.0, at: 90000),  // good — breaks the run
             record(avg: 4.0, at: 92000)   // poor, recent but close to previous poor
         ]
-        #expect(DriftAlert.compute(from: records) == nil)
+        XCTAssertNil(DriftAlert.compute(from: records))
     }
 
-    @Test("Only the final consecutive poor run is considered")
-    func onlySuffixRun() {
+    func testOnlySuffixRun() {
         let records = [
             record(avg: 4.0, at: 0),     // poor
             record(avg: 4.5, at: 18000), // poor, > 1h from first
@@ -67,26 +59,24 @@ struct DriftAlertTests {
             record(avg: 4.0, at: 25000), // poor
             record(avg: 4.5, at: 26000)  // poor, < 1h and same day
         ]
-        #expect(DriftAlert.compute(from: records) == nil)
+        XCTAssertNil(DriftAlert.compute(from: records))
     }
 
-    @Test("Final consecutive poor run alerts when far apart")
-    func suffixRunAlerts() {
+    func testSuffixRunAlerts() {
         let records = [
             record(avg: 1.0, at: 0),      // good
             record(avg: 4.0, at: 1000),   // poor
             record(avg: 4.5, at: 4600)    // poor, 1h after previous
         ]
-        #expect(DriftAlert.compute(from: records) != nil)
+        XCTAssertNotNil(DriftAlert.compute(from: records))
     }
 
-    @Test("A single final poor record after good records does not alert")
-    func singleFinalPoor() {
+    func testSingleFinalPoor() {
         let records = [
             record(avg: 1.0, at: 0),
             record(avg: 4.0, at: 86400)
         ]
-        #expect(DriftAlert.compute(from: records) == nil)
+        XCTAssertNil(DriftAlert.compute(from: records))
     }
 
     private func record(avg: Double, at offset: TimeInterval) -> VerificationRecord {

Tests/ICCeryCoreTests/FileHelpersTests.swift

@@ -1,4 +1,4 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 
@@ -13,91 +13,88 @@ private func touch(_ url: URL, _ contents: String = "x") throws {
     try contents.write(to: url, atomically: true, encoding: .utf8)
 }
 
-@Suite("PathSecurity")
-struct PathSecurityTests {
-    @Test func rejectsTraversalAndSeparators() {
+final class PathSecurityTests: XCTestCase {
+    func testRejectsTraversalAndSeparators() {
         for bad in ["a/b", "a\\b", "..", "a/../b", "", "..x"] {
-            #expect(!PathSecurity.isValidBasename(bad))
-            #expect(throws: PathSecurity.Error.self) {
-                try PathSecurity.sanitizeBasename(bad)
+            XCTAssertFalse(PathSecurity.isValidBasename(bad))
+            XCTAssertThrowsError(try PathSecurity.sanitizeBasename(bad)) { error in
+                XCTAssertTrue(error is PathSecurity.Error)
             }
         }
     }
 
-    @Test func acceptsNormalNames() {
+    func testAcceptsNormalNames() {
         for good in ["target", "My Target 01", "écheneau-ümläut", "a.b"] {
-            #expect(PathSecurity.isValidBasename(good))
+            XCTAssertTrue(PathSecurity.isValidBasename(good))
         }
     }
 
-    @Test func resolveSafeCwdPrefersExplicit() throws {
+    func testResolveSafeCwdPrefersExplicit() throws {
         let dir = try tempDir()
-        #expect(PathSecurity.resolveSafeCwd(dir) == dir)
+        XCTAssertEqual(PathSecurity.resolveSafeCwd(dir), dir)
     }
 
-    @Test func resolveSafeCwdNeverReturnsNil() {
+    func testResolveSafeCwdNeverReturnsNil() {
         let missing = URL(fileURLWithPath: "/nonexistent-\(UUID().uuidString)")
         let resolved = PathSecurity.resolveSafeCwd(missing)
-        #expect(FileManager.default.fileExists(atPath: resolved.path))
+        XCTAssertTrue(FileManager.default.fileExists(atPath: resolved.path))
     }
 }
 
-@Suite("AtomicFileWriter")
-struct AtomicFileWriterTests {
-    @Test func writesAndLeavesNoTmp() throws {
+final class AtomicFileWriterTests: XCTestCase {
+    func testWritesAndLeavesNoTmp() throws {
         let dir = try tempDir()
         let url = dir.appendingPathComponent("state.json")
         try AtomicFileWriter.write(Data("{\"a\":1}".utf8), to: url)
-        #expect(try String(contentsOf: url, encoding: .utf8) == "{\"a\":1}")
-        #expect(!FileManager.default.fileExists(atPath: url.appendingPathExtension("tmp").path))
+        XCTAssertEqual(try String(contentsOf: url, encoding: .utf8), "{\"a\":1}")
+        XCTAssertFalse(FileManager.default.fileExists(atPath: url.appendingPathExtension("tmp").path))
     }
 
-    @Test func overwritesExistingAtomically() throws {
+    func testOverwritesExistingAtomically() throws {
         let dir = try tempDir()
         let url = dir.appendingPathComponent("f.txt")
         try AtomicFileWriter.write("one", to: url)
         try AtomicFileWriter.write("two-longer", to: url)
-        #expect(try String(contentsOf: url, encoding: .utf8) == "two-longer")
+        XCTAssertEqual(try String(contentsOf: url, encoding: .utf8), "two-longer")
     }
 
-    @Test func createsParentDirs() throws {
+    func testCreatesParentDirs() throws {
         let dir = try tempDir()
         let url = dir.appendingPathComponent("a/b/c/deep.json")
         try AtomicFileWriter.write("{}", to: url)
-        #expect(FileManager.default.fileExists(atPath: url.path))
+        XCTAssertTrue(FileManager.default.fileExists(atPath: url.path))
     }
 }
 
-@Suite("ArtefactProbe")
-struct ArtefactProbeTests {
-    @Test func verifyProgression() throws {
+final class ArtefactProbeTests: XCTestCase {
+    func testVerifyProgression() throws {
         let dir = try tempDir()
         var v = ArtefactProbe.verify(basename: "t", cwd: dir)
-        #expect(v == StageArtefacts())
+        XCTAssertEqual(v, StageArtefacts())
 
         try touch(dir.appendingPathComponent("t.ti1"))
         v = ArtefactProbe.verify(basename: "t", cwd: dir)
-        #expect(v.stage1Complete && !v.stage2Complete && !v.stage3Complete)
+        XCTAssertTrue(v.stage1Complete && !v.stage2Complete && !v.stage3Complete)
 
         try touch(dir.appendingPathComponent("t.ti2"))
         try touch(dir.appendingPathComponent("t.ti3"))
         v = ArtefactProbe.verify(basename: "t", cwd: dir)
-        #expect(v.stage2Complete && v.stage3Complete && !v.stage4Complete)
+        XCTAssertTrue(v.stage2Complete && v.stage3Complete && !v.stage4Complete)
 
         try touch(dir.appendingPathComponent("t.icc"))
         v = ArtefactProbe.verify(basename: "t", cwd: dir)
-        #expect(v.stage4Complete && v.profilePath?.pathExtension == "icc")
+        XCTAssertTrue(v.stage4Complete && v.profilePath?.pathExtension == "icc")
     }
 
-    @Test func icmWinsOverIcc() throws {
+    func testIcmWinsOverIcc() throws {
         let dir = try tempDir()
         try touch(dir.appendingPathComponent("p.icc"))
         try touch(dir.appendingPathComponent("p.icm"))
         let profile = ArtefactProbe.resolveProfile(basename: "p", cwd: dir)
-        #expect(profile?.pathExtension == "icm")
+        XCTAssertEqual(profile?.pathExtension, "icm")
     }
 
-    @Test func enumeratesPassesPagesAndCAL() throws {
+    func testEnumeratesPassesPagesAndCAL() throws {
         let dir = try tempDir()
         for name in [
             "t.ti1", "t.ti2", "t.tif", "t.2.tif", "t_03.tif",
@@ -115,15 +112,15 @@ struct ArtefactProbeTests {
             "t.ti3", "t_pass1.ti3", "t_pass2.ti3",
             "t.icc", "t.gam", "CAL_t.ti1", "CAL_t.cal",
         ] {
-            #expect(names.contains(expected), "missing \(expected)")
+            XCTAssertTrue(names.contains(expected), "missing \(expected)")
         }
-        #expect(!names.contains("other.ti1"))
-        #expect(!names.contains("t.txt"))
-        #expect(!names.contains("CAL_other.ti1"))
+        XCTAssertFalse(names.contains("other.ti1"))
+        XCTAssertFalse(names.contains("t.txt"))
+        XCTAssertFalse(names.contains("CAL_other.ti1"))
     }
 
-    @Test func emptyDirReturnsEmpty() throws {
+    func testEmptyDirReturnsEmpty() throws {
         let dir = try tempDir()
-        #expect(ArtefactProbe.existingArtefacts(basename: "x", cwd: dir).isEmpty)
+        XCTAssertTrue(ArtefactProbe.existingArtefacts(basename: "x", cwd: dir).isEmpty)
     }
 }

Tests/ICCeryCoreTests/GamutGeometryBuilderTests.swift

@@ -1,15 +1,13 @@
-import Testing
+import XCTest
 import SceneKit
 import ICCeryCore
 @testable import ICCery
 
 /// ``GamutSceneGeometryBuilder`` edge-case tests.
-@Suite("Gamut scene geometry builder")
 @MainActor
-struct GamutGeometryBuilderTests {
+final class GamutGeometryBuilderTests: XCTestCase {
 
-    @Test("Drops out-of-bounds faces from the element without crashing")
-    func dropsOutOfBoundsFaces() {
+    func testDropsOutOfBoundsFaces() {
         let white = GamutVertex(
             lab: LabColor(l: 100, a: 0, b: 0),
             rgb: DisplayRGB(r: 1, g: 1, b: 1)
@@ -28,6 +26,6 @@ struct GamutGeometryBuilderTests {
 
         let (_, element) = GamutSceneGeometryBuilder.geometry(for: mesh)
 
-        #expect(element.primitiveCount == 1, "Only the in-bounds face should be in the index buffer")
+        XCTAssertEqual(element.primitiveCount, 1, "Only the in-bounds face should be in the index buffer")
     }
 }

Tests/ICCeryCoreTests/GamutMeshParserTests.swift

@@ -1,10 +1,9 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
 /// ``GamutMeshParser`` acceptance + edge-case tests.
-@Suite("Gamut mesh parser")
-struct GamutMeshParserTests {
+final class GamutMeshParserTests: XCTestCase {
 
     /// Returns the bundled real `sRGB.gam` in `Resources/Argyll/reference_gamuts`.
     private var bundledSRGBGamURL: URL {
@@ -13,16 +12,14 @@ struct GamutMeshParserTests {
         return resource.appendingPathComponent("Argyll/reference_gamuts/sRGB.gam")
     }
 
-    @Test("Parses bundled sRGB.gam")
-    func parsesBundledSRGB() throws {
+    func testParsesBundledSRGB() throws {
         let mesh = try GamutMeshParser.parse(url: bundledSRGBGamURL)
 
-        #expect(mesh.vertices.count == 448, "sRGB.gam has 448 vertices")
-        #expect(mesh.faces.count == 892, "sRGB.gam has 892 faces")
+        XCTAssertEqual(mesh.vertices.count, 448, "sRGB.gam has 448 vertices")
+        XCTAssertEqual(mesh.faces.count, 892, "sRGB.gam has 892 faces")
     }
 
-    @Test("Discards VERTEX_NO and uses push-order indices")
-    func discardsVertexNo() throws {
+    func testDiscardsVertexNo() throws {
         let text = """
         GAMUT
         NUMBER_OF_FIELDS 4
@@ -49,14 +46,13 @@ struct GamutMeshParserTests {
 
         let mesh = try GamutMeshParser.parse(text: text)
 
-        #expect(mesh.vertices.count == 4)
-        #expect(mesh.faces.count == 2)
-        #expect(mesh.vertices[0].lab == LabColor(l: 10, a: 20, b: 30))
-        #expect(mesh.vertices[3].lab == LabColor(l: 40, a: 50, b: 60))
+        XCTAssertEqual(mesh.vertices.count, 4)
+        XCTAssertEqual(mesh.faces.count, 2)
+        XCTAssertEqual(mesh.vertices[0].lab, LabColor(l: 10, a: 20, b: 30))
+        XCTAssertEqual(mesh.vertices[3].lab, LabColor(l: 40, a: 50, b: 60))
     }
 
-    @Test("Ignores comments and blank lines")
-    func ignoresComments() throws {
+    func testIgnoresComments() throws {
         let text = """
         # Header comment
         NUMBER_OF_FIELDS 4
@@ -81,12 +77,11 @@ struct GamutMeshParserTests {
         """
 
         let mesh = try GamutMeshParser.parse(text: text)
-        #expect(mesh.vertices.count == 2)
-        #expect(mesh.faces.count == 1)
+        XCTAssertEqual(mesh.vertices.count, 2)
+        XCTAssertEqual(mesh.faces.count, 1)
     }
 
-    @Test("Remaps coordinates to x=a*, y=L*, z=b*")
-    func remapsCoordinates() throws {
+    func testRemapsCoordinates() throws {
         let text = """
         NUMBER_OF_FIELDS 4
         BEGIN_DATA_FORMAT
@@ -99,11 +94,10 @@ struct GamutMeshParserTests {
         """
 
         let mesh = try GamutMeshParser.parse(text: text)
-        #expect(mesh.vertices.first?.position == SIMD3<Float>(-20, 50, 80))
+        XCTAssertEqual(mesh.vertices.first?.position, SIMD3<Float>(-20, 50, 80))
     }
 
-    @Test("Computes per-vertex sRGB colour")
-    func computesVertexColor() throws {
+    func testComputesVertexColor() throws {
         let text = """
         NUMBER_OF_FIELDS 4
         BEGIN_DATA_FORMAT
@@ -116,14 +110,13 @@ struct GamutMeshParserTests {
         """
 
         let mesh = try GamutMeshParser.parse(text: text)
-        let white = try #require(mesh.vertices.first).rgb
-        #expect(white.r > 0.95)
-        #expect(white.g > 0.95)
-        #expect(white.b > 0.95)
+        let white = try XCTUnwrap(mesh.vertices.first).rgb
+        XCTAssertTrue(white.r > 0.95)
+        XCTAssertTrue(white.g > 0.95)
+        XCTAssertTrue(white.b > 0.95)
     }
 
-    @Test("Drops out-of-bounds face indices")
-    func dropsOutOfBoundsFaces() throws {
+    func testDropsOutOfBoundsFaces() throws {
         let text = """
         NUMBER_OF_FIELDS 4
         BEGIN_DATA_FORMAT
@@ -146,21 +139,23 @@ struct GamutMeshParserTests {
         """
 
         let mesh = try GamutMeshParser.parse(text: text)
-        #expect(mesh.faces.count == 1)
+        XCTAssertEqual(mesh.faces.count, 1)
     }
 
-    @Test("Throws on empty file")
-    func throwsOnEmptyFile() {
-        #expect(throws: GamutMeshParseError.noDataBlock) {
-            _ = try GamutMeshParser.parse(text: "")
+    func testThrowsOnEmptyFile() {
+        XCTAssertThrowsError(try GamutMeshParser.parse(text: "")) { error in
+            guard case GamutMeshParseError.noDataBlock = error else {
+                return XCTFail("Expected GamutMeshParseError.noDataBlock, got \(error)")
+            }
         }
     }
 
-    @Test("Throws when file is missing")
-    func throwsWhenMissing() {
+    func testThrowsWhenMissing() {
         let url = URL(fileURLWithPath: "/nonexistent/path/to/mesh.gam")
-        #expect(throws: GamutMeshParseError.missingFile) {
-            _ = try GamutMeshParser.parse(url: url)
+        XCTAssertThrowsError(try GamutMeshParser.parse(url: url)) { error in
+            guard case GamutMeshParseError.missingFile = error else {
+                return XCTFail("Expected GamutMeshParseError.missingFile, got \(error)")
+            }
         }
     }
 }

Tests/ICCeryCoreTests/IccgamutArgsTests.swift

@@ -1,16 +1,14 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("IccgamutArgs")
-struct IccgamutArgsTests {
+final class IccgamutArgsTests: XCTestCase {
 
-    @Test("Density is 10 and not a directory")
-    func densityNotDirectory() throws {
+    func testDensityNotDirectory() throws {
         let config = IccgamutConfig(
             profileURL: URL(fileURLWithPath: "/tmp/MyProfile.icc")
         )
         let args = try IccgamutArgs.build(config: config)
-        #expect(args == ["-v", "-d", "10", "/tmp/MyProfile.icc"])
+        XCTAssertEqual(args, ["-v", "-d", "10", "/tmp/MyProfile.icc"])
     }
 }

Tests/ICCeryCoreTests/JSONFileStoreTests.swift

@@ -1,26 +1,23 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("JSONFileStore")
-struct JSONFileStoreTests {
+final class JSONFileStoreTests: XCTestCase {
     private func tempURL() -> URL {
         FileManager.default.temporaryDirectory
             .appendingPathComponent("json-store-\(UUID().uuidString).json")
     }
 
-    @Test("Missing file returns default")
-    func missingFileDefaults() throws {
+    func testMissingFileDefaults() throws {
         let store = JSONFileStore<AppSettings>(
             fileURL: tempURL(),
             corrupt: .throwCorrupt,
             defaultValue: { .default }
         )
-        #expect(try store.load() == .default)
+        XCTAssertEqual(try store.load(), .default)
     }
 
-    @Test("Corrupt file with replaceWithDefault returns default and leaves bytes")
-    func corruptDefaults() throws {
+    func testCorruptDefaults() throws {
         let url = tempURL()
         try "{ not json".write(to: url, atomically: true, encoding: .utf8)
         let store = JSONFileStore<AppSettings>(
@@ -28,13 +25,12 @@ struct JSONFileStoreTests {
             corrupt: .replaceWithDefault,
             defaultValue: { .default }
         )
-        #expect(try store.load() == .default)
+        XCTAssertEqual(try store.load(), .default)
         let kept = try String(contentsOf: url, encoding: .utf8)
-        #expect(kept == "{ not json")
+        XCTAssertEqual(kept, "{ not json")
     }
 
-    @Test("Corrupt file with throwCorrupt throws and leaves bytes")
-    func corruptThrows() throws {
+    func testCorruptThrows() throws {
         let url = tempURL()
         try "not json".write(to: url, atomically: true, encoding: .utf8)
         let store = JSONFileStore<[Int]>(
@@ -42,15 +38,12 @@ struct JSONFileStoreTests {
             corrupt: .throwCorrupt,
             defaultValue: { [] }
         )
-        #expect(throws: DecodingError.self) {
-            _ = try store.load()
-        }
+        XCTAssertThrowsError(try store.load()) { error in XCTAssertTrue(error is DecodingError) }
         let kept = try String(contentsOf: url, encoding: .utf8)
-        #expect(kept == "not json")
+        XCTAssertEqual(kept, "not json")
     }
 
-    @Test("Pretty sorted keys")
-    func prettySorted() throws {
+    func testPrettySorted() throws {
         let url = tempURL()
         let store = JSONFileStore<AppSettings>(
             fileURL: url,
@@ -59,8 +52,8 @@ struct JSONFileStoreTests {
         )
         try store.save(.default)
         let text = try String(contentsOf: url, encoding: .utf8)
-        #expect(text.contains("\n"))
-        #expect(text.contains("\"delta_e_good_max\""))
+        XCTAssertTrue(text.contains("\n"))
+        XCTAssertTrue(text.contains("\"delta_e_good_max\""))
         // Lexical key sorting: ascending order of top-level keys.
         let keys = [
             "ask_before_overwrite_profile",
@@ -75,7 +68,7 @@ struct JSONFileStoreTests {
         var lastIndex = text.startIndex
         for key in keys {
             guard let range = text.range(of: "\"\(key)\"", range: lastIndex..<text.endIndex) else {
-                Issue.record("missing or out-of-order key \(key)")
+                XCTFail("missing or out-of-order key \(key)")
                 return
             }
             lastIndex = range.upperBound

Tests/ICCeryCoreTests/LpArgsTests.swift

@@ -1,12 +1,11 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 
 /// Issue 15 — `lp` argv goldens (docs/11 `build_lp_args`).
 /// `-d`/`options`/`-t` handling is in `CupsService`; these tests cover
 /// flag order, captured-option precedence, and sanitisation.
-@Suite("LpArgs")
-struct LpArgsTests {
+final class LpArgsTests: XCTestCase {
 
     private let tiff = "/tmp/work/target_001.tif"
     private let queue = "EPSON_XP_55_Series"
@@ -20,112 +19,100 @@ struct LpArgsTests {
             options: options, optionKeys: optionKeys)
     }
 
-    @Test("Header: -d queue -t title, both AP_* first, TIFF last")
-    func header() throws {
+    func testHeader() throws {
         let argv = try build()
-        #expect(Array(argv[0...1]) == ["-d", queue])
-        #expect(Array(argv[2...3]) == ["-t", "ICCery Target - target_001.tif"])
-        #expect(Array(argv[4...5])
-            == ["-o", "AP_ColorMatchingMode=AP_ApplicationColorMatching"])
-        #expect(Array(argv[6...7])
-            == ["-o", "AP.ColorMatchingMode=AP_ApplicationColorMatching"])
-        #expect(argv.last == tiff)
-        #expect(!argv.contains { $0 == "raw" || $0 == "-o raw" })
+        XCTAssertEqual(Array(argv[0...1]), ["-d", queue])
+        XCTAssertEqual(Array(argv[2...3]), ["-t", "ICCery Target - target_001.tif"])
+        XCTAssertEqual(Array(argv[4...5]), ["-o", "AP_ColorMatchingMode=AP_ApplicationColorMatching"])
+        XCTAssertEqual(Array(argv[6...7]), ["-o", "AP.ColorMatchingMode=AP_ApplicationColorMatching"])
+        XCTAssertEqual(argv.last, tiff)
+        XCTAssertFalse(argv.contains { $0 == "raw" || $0 == "-o raw" })
     }
 
-    @Test("Never emits -o raw; captured raw= is dropped")
-    func neverRaw() throws {
+    func testNeverRaw() throws {
         let argv = try build(options: PrintOptions(
             cupsOptions: "raw=true MediaType=Photo"))
         for (i, arg) in argv.enumerated() where arg == "-o" {
-            #expect(argv[i + 1] != "raw")
-            #expect(argv[i + 1] != "raw=true")
+            XCTAssertNotEqual(argv[i + 1], "raw")
+            XCTAssertNotEqual(argv[i + 1], "raw=true")
         }
-        #expect(!argv.contains { $0.hasPrefix("raw=") })
-        #expect(argv.contains("MediaType=Photo"))
+        XCTAssertFalse(argv.contains { $0.hasPrefix("raw=") })
+        XCTAssertTrue(argv.contains("MediaType=Photo"))
     }
 
-    @Test("Captured options replayed after AP_* headers")
-    func capturedReplay() throws {
+    func testCapturedReplay() throws {
         let argv = try build(options: PrintOptions(
             cupsOptions: "InputSlot=Rear MediaType=Photo"))
         let rear = argv.firstIndex(of: "InputSlot=Rear")!
         let apFirst = argv.firstIndex(of:
             "AP_ColorMatchingMode=AP_ApplicationColorMatching")!
-        #expect(rear > apFirst)
+        XCTAssertTrue(rear > apFirst)
     }
 
-    @Test("Captured wins: media key present → derived media skipped")
-    func capturedWinsMedia() throws {
+    func testCapturedWinsMedia() throws {
         let argv = try build(
             options: PrintOptions(
                 mediaType: "Plain",
                 cupsOptions: "MediaType=Glossy"),
             optionKeys: ["MediaType"])
-        #expect(argv.contains("MediaType=Glossy"))
-        #expect(!argv.contains("MediaType=Plain"))
+        XCTAssertTrue(argv.contains("MediaType=Glossy"))
+        XCTAssertFalse(argv.contains("MediaType=Plain"))
     }
 
-    @Test("Media emitted via detected key when not captured")
-    func mediaDerived() throws {
+    func testMediaDerived() throws {
         let argv = try build(
             options: PrintOptions(mediaType: "SemiGloss"),
             optionKeys: ["CNIJMediaType", "MediaType"])
         // CNIJMediaType wins over MediaType in detection order.
-        #expect(argv.contains("CNIJMediaType=SemiGloss"))
-        #expect(!argv.contains("MediaType=SemiGloss"))
+        XCTAssertTrue(argv.contains("CNIJMediaType=SemiGloss"))
+        XCTAssertFalse(argv.contains("MediaType=SemiGloss"))
     }
 
-    @Test("Driver bypass emitted when absent, skipped when captured")
-    func bypassRules() throws {
+    func testBypassRules() throws {
         let withBypass = try build(
             optionKeys: ["EPIJ_CMat"])
-        #expect(withBypass.contains("EPIJ_CMat=3"))
+        XCTAssertTrue(withBypass.contains("EPIJ_CMat=3"))
 
         let captured = try build(
             options: PrintOptions(cupsOptions: "EPIJ_CMat=1"),
             optionKeys: ["EPIJ_CMat"])
         // Captured value kept, detection not re-applied.
-        #expect(captured.filter { $0.hasPrefix("EPIJ_CMat") }
-            == ["EPIJ_CMat=1"])
+        XCTAssertEqual(captured.filter { $0.hasPrefix("EPIJ_CMat") }, ["EPIJ_CMat=1"])
     }
 
-    @Test("Orientation: portrait=3 landscape=4; captured wins")
-    func orientation() throws {
-        #expect(try build(options: PrintOptions(orientation: "portrait"))
+    func testOrientation() throws {
+        XCTAssertTrue(try build(options: PrintOptions(orientation: "portrait"))
             .contains("orientation-requested=3"))
-        #expect(try build(options: PrintOptions(orientation: "landscape"))
+        XCTAssertTrue(try build(options: PrintOptions(orientation: "landscape"))
             .contains("orientation-requested=4"))
         let capturedOrients = try build(options: PrintOptions(
             orientation: "landscape",
             cupsOptions: "orientation-requested=5"))
-        #expect(!capturedOrients.contains("orientation-requested=4"))
-        #expect(capturedOrients.contains("orientation-requested=5"))
+        XCTAssertFalse(capturedOrients.contains("orientation-requested=4"))
+        XCTAssertTrue(capturedOrients.contains("orientation-requested=5"))
     }
 
-    @Test("PageSize emitted unless captured")
-    func pageSize() throws {
-        #expect(try build(options: PrintOptions(paperSize: "A4"))
+    func testPageSize() throws {
+        XCTAssertTrue(try build(options: PrintOptions(paperSize: "A4"))
             .contains("PageSize=A4"))
         let capturedSize = try build(options: PrintOptions(
             paperSize: "A4", cupsOptions: "PageSize=Letter"))
-        #expect(!capturedSize.contains("PageSize=A4"))
-        #expect(capturedSize.contains("PageSize=Letter"))
+        XCTAssertFalse(capturedSize.contains("PageSize=A4"))
+        XCTAssertTrue(capturedSize.contains("PageSize=Letter"))
     }
 
-    @Test("Sanitise rejects `;`, newline, and shell metachars")
-    func sanitise() throws {
-        #expect(throws: LpArgsError.self) {
-            _ = try build(options: PrintOptions(
-                cupsOptions: "InputSlot=Rear;rm -rf /"))
+    func testSanitise() throws {
+        XCTAssertThrowsError(try build(options: PrintOptions(
+            cupsOptions: "InputSlot=Rear;rm -rf /"))) { error in
+            XCTAssertTrue(error is LpArgsError)
         }
-        #expect(throws: LpArgsError.self) {
-            _ = try build(options: PrintOptions(
-                cupsOptions: "InputSlot=Rear\nMediaType=Photo"))
+        XCTAssertThrowsError(try build(options: PrintOptions(
+            cupsOptions: "InputSlot=Rear\nMediaType=Photo"))) { error in
+            XCTAssertTrue(error is LpArgsError)
         }
-        #expect(throws: LpArgsError.self) {
-            _ = try build(options: PrintOptions(
-                cupsOptions: "InputSlot=$(whoami)"))
+        XCTAssertThrowsError(try build(options: PrintOptions(
+            cupsOptions: "InputSlot=$(whoami)"))) { error in
+            XCTAssertTrue(error is LpArgsError)
         }
     }
 }

Tests/ICCeryCoreTests/MeasurementTests.swift

@@ -1,12 +1,10 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("InstrumentParser")
-struct InstrumentParserTests {
+final class InstrumentParserTests: XCTestCase {
 
-    @Test("Parses pretty-printed instlist JSON")
-    func json() throws {
+    func testJson() throws {
         let json = """
         {
           "event": "instruments",
@@ -18,134 +16,118 @@ struct InstrumentParserTests {
         }
         """
         let devices = try InstrumentParser.parse(json)
-        #expect(devices.count == 3)
-        #expect(devices[0].port == 1)
-        #expect(devices[0].name == "X-Rite i1Pro")
-        #expect(devices[2].port == 3)
+        XCTAssertEqual(devices.count, 3)
+        XCTAssertEqual(devices[0].port, 1)
+        XCTAssertEqual(devices[0].name, "X-Rite i1Pro")
+        XCTAssertEqual(devices[2].port, 3)
     }
 
-    @Test("Falls back to regex for legacy instlist text")
-    func regexFallback() throws {
+    func testRegexFallback() throws {
         let text = """
         1: 'X-Rite i1Pro' on usb
         2: 'ColorMunki Smile'
         """ + "\n"
         let devices = try InstrumentParser.parse(text)
-        #expect(devices.count == 2)
-        #expect(devices[0].port == 1)
-        #expect(devices[1].name == "ColorMunki Smile")
+        XCTAssertEqual(devices.count, 2)
+        XCTAssertEqual(devices[0].port, 1)
+        XCTAssertEqual(devices[1].name, "ColorMunki Smile")
     }
 
-    @Test("Empty output returns no devices")
-    func empty() throws {
-        #expect(try InstrumentParser.parse("").isEmpty)
+    func testEmpty() throws {
+        XCTAssertTrue(try InstrumentParser.parse("").isEmpty)
     }
 }
 
-@Suite("ChartreadArgs")
-struct ChartreadArgsTests {
+final class ChartreadArgsTests: XCTestCase {
 
-    @Test("Baseline argv and port 1 omits -c")
-    func baseline() throws {
+    func testBaseline() throws {
         let config = ChartreadConfig(basename: "target", selectedPort: 1)
         let args = try ChartreadArgs.build(config: config)
-        #expect(args == ["-v", "-u", "target"])
+        XCTAssertEqual(args, ["-v", "-u", "target"])
     }
 
-    @Test("Port > 1 emits -c")
-    func portArgument() throws {
+    func testPortArgument() throws {
         let config = ChartreadConfig(basename: "target", selectedPort: 3)
         let args = try ChartreadArgs.build(config: config)
-        #expect(args == ["-v", "-u", "-c", "3", "target"])
+        XCTAssertEqual(args, ["-v", "-u", "-c", "3", "target"])
     }
 
-    @Test("LEDs emit -Y l")
-    func leds() throws {
+    func testLeds() throws {
         let config = ChartreadConfig(
             basename: "target",
             selectedPort: 2,
             enableLEDs: true
         )
         let args = try ChartreadArgs.build(config: config)
-        #expect(args.contains("-Y"))
-        #expect(args.contains("l"))
+        XCTAssertTrue(args.contains("-Y"))
+        XCTAssertTrue(args.contains("l"))
     }
 
-    @Test("Auto omits -c")
-    func autoPort() throws {
+    func testAutoPort() throws {
         let config = ChartreadConfig(basename: "target")
         let args = try ChartreadArgs.build(config: config)
-        #expect(!args.contains("-c"))
+        XCTAssertFalse(args.contains("-c"))
     }
 }
 
-@Suite("ChartreadClassifier")
-struct ChartreadClassifierTests {
+final class ChartreadClassifierTests: XCTestCase {
 
-    @Test("Calibration prompt")
-    func calibration() {
+    func testCalibration() {
         let r = ChartreadClassifier.classify(
             line: "Place instrument on calibration tile and hit [Space] to calibrate.",
             previousState: .idle
         )
-        #expect(r.state == .calibrating)
+        XCTAssertEqual(r.state, .calibrating)
     }
 
-    @Test("Strip awaiting")
-    func awaitingStrip() {
+    func testAwaitingStrip() {
         let r = ChartreadClassifier.classify(
             line: "Hit [Space] to read strip A",
             previousState: .calibrating
         )
-        #expect(r.state == .awaitingStrip)
+        XCTAssertEqual(r.state, .awaitingStrip)
     }
 
-    @Test("Done prompt")
-    func done() {
+    func testDone() {
         let r = ChartreadClassifier.classify(
             line: "'d' if/when done",
             previousState: .awaitingStrip
         )
-        #expect(r.state == .allStripsRead)
+        XCTAssertEqual(r.state, .allStripsRead)
     }
 
-    @Test("XY place sheet")
-    func placeSheet() {
+    func testPlaceSheet() {
         let r = ChartreadClassifier.classify(
             line: "Please place sheet 1 of 2 on the table",
             previousState: .idle
         )
-        #expect(r.state == .tablePlaceSheet)
-        #expect(r.sheetNumber == 1)
-        #expect(r.sheetTotal == 2)
+        XCTAssertEqual(r.state, .tablePlaceSheet)
+        XCTAssertEqual(r.sheetNumber, 1)
+        XCTAssertEqual(r.sheetTotal, 2)
     }
 
-    @Test("XY locate patch")
-    func locatePatch() {
+    func testLocatePatch() {
         let r = ChartreadClassifier.classify(
             line: "locate patch A1 with the sight,",
             previousState: .tablePlaceSheet
         )
-        #expect(r.state == .tableAlign)
-        #expect(r.alignmentPatch == "A1")
+        XCTAssertEqual(r.state, .tableAlign)
+        XCTAssertEqual(r.alignmentPatch, "A1")
     }
 
-    @Test("Remove sheet notice preserves state")
-    func removeNotice() {
+    func testRemoveNotice() {
         let r = ChartreadClassifier.classify(
             line: "Please remove last sheet from table",
             previousState: .tablePlaceSheet
         )
-        #expect(r.state == .tablePlaceSheet)
-        #expect(r.isRemoveSheetNotice == true)
+        XCTAssertEqual(r.state, .tablePlaceSheet)
+        XCTAssertEqual(r.isRemoveSheetNotice, true)
     }
 }
 
-@Suite("ChartreadRow")
-struct ChartreadRowTests {
+final class ChartreadRowTests: XCTestCase {
 
-    @Test("Decodes row JSON")
-    func decode() throws {
+    func testDecode() throws {
         let json = """
         {"event": "row_complete", "row_id": "A", "row_index": 0, "total_rows": 2,
          "patch_count": 1, "patches": [
@@ -155,13 +137,12 @@ struct ChartreadRowTests {
          ]}
         """
         let row = try JSONDecoder().decode(ChartreadRow.self, from: Data(json.utf8))
-        #expect(row.rowId == "A")
-        #expect(row.patchCount == 1)
-        #expect(row.patches[0].measured.lab?.l == 51)
+        XCTAssertEqual(row.rowId, "A")
+        XCTAssertEqual(row.patchCount, 1)
+        XCTAssertEqual(row.patches[0].measured.lab?.l, 51)
     }
 
-    @Test("Decodes a row carrying both XYZ and Lab arrays")
-    func decodeXYZAndLab() throws {
+    func testDecodeXYZAndLab() throws {
         let json = """
         {"event": "row_complete", "row_id": "B", "row_index": 1, "total_rows": 2,
          "patch_count": 1, "patches": [
@@ -171,88 +152,78 @@ struct ChartreadRowTests {
         """
         let row = try JSONDecoder().decode(ChartreadRow.self, from: Data(json.utf8))
         let measured = row.patches[0].measured
-        #expect(measured.xyz == CIEXYZ(x: 30.5, y: 32.1, z: 25.9))
-        #expect(measured.lab == CIELab(l: 63.4, a: 2.5, b: -8.2))
+        XCTAssertEqual(measured.xyz, CIEXYZ(x: 30.5, y: 32.1, z: 25.9))
+        XCTAssertEqual(measured.lab, CIELab(l: 63.4, a: 2.5, b: -8.2))
     }
 
-    @Test("XYZColor/CIEXYZ encode as an unkeyed three-number array")
-    func xyzWireEncoding() throws {
+    func testXyzWireEncoding() throws {
         for color in [XYZColor(x: 1.5, y: 2.5, z: 3.5), CIEXYZ(x: 1.5, y: 2.5, z: 3.5)] {
             let value = try JSONSerialization.jsonObject(
                 with: JSONEncoder().encode(color))
-            #expect(value as? [Double] == [1.5, 2.5, 3.5])
+            XCTAssertEqual(value as? [Double], [1.5, 2.5, 3.5])
         }
     }
 
-    @Test("LabColor/CIELab encode as an unkeyed three-number array")
-    func labWireEncoding() throws {
+    func testLabWireEncoding() throws {
         for color in [LabColor(l: 50, a: -1, b: 2), CIELab(l: 50, a: -1, b: 2)] {
             let value = try JSONSerialization.jsonObject(
                 with: JSONEncoder().encode(color))
-            #expect(value as? [Double] == [50, -1, 2])
+            XCTAssertEqual(value as? [Double], [50, -1, 2])
         }
     }
 
-    @Test("PatchColor keeps the XYZ and Lab keys over unkeyed arrays")
-    func patchColorKeys() throws {
+    func testPatchColorKeys() throws {
         let color = PatchColor(
             xyz: CIEXYZ(x: 10, y: 20, z: 30),
             lab: CIELab(l: 55, a: 1, b: -2))
         let object = try JSONSerialization.jsonObject(
             with: JSONEncoder().encode(color)) as? [String: Any]
-        #expect(object?["XYZ"] as? [Double] == [10, 20, 30])
-        #expect(object?["Lab"] as? [Double] == [55, 1, -2])
-        #expect(object?["spectral"] == nil)
+        XCTAssertEqual(object?["XYZ"] as? [Double], [10, 20, 30])
+        XCTAssertEqual(object?["Lab"] as? [Double], [55, 1, -2])
+        XCTAssertNil(object?["spectral"])
     }
 }
 
-@Suite("ColourMath")
-struct ColourMathTests {
+final class ColourMathTests: XCTestCase {
 
-    @Test("White XYZ to Lab")
-    func whiteLab() {
+    func testWhiteLab() {
         let white = XYZColor(x: 96.4212, y: 100.0, z: 82.5188)
         let lab = LabColorMath.xyzToLab(white)
-        #expect(abs(lab.l - 100) < 0.5)
-        #expect(abs(lab.a) < 0.5)
-        #expect(abs(lab.b) < 0.5)
+        XCTAssertTrue(abs(lab.l - 100) < 0.5)
+        XCTAssertTrue(abs(lab.a) < 0.5)
+        XCTAssertTrue(abs(lab.b) < 0.5)
     }
 
-    @Test("Lab to sRGB roundtrip is clamped")
-    func labToSRGB() {
+    func testLabToSRGB() {
         let red = LabColor(l: 55, a: 80, b: 70)
         let rgb = LabColorMath.labToSRGB(red)
-        #expect(rgb.r > 0.8)
-        #expect(rgb.g < 0.2)
-        #expect(rgb.b < 0.2)
+        XCTAssertTrue(rgb.r > 0.8)
+        XCTAssertTrue(rgb.g < 0.2)
+        XCTAssertTrue(rgb.b < 0.2)
     }
 
-    @Test("Pad white returns DisplayRGB")
-    func padWhite() {
+    func testPadWhite() {
         let white = LabColor(l: 95, a: 0, b: 0)
         let rgb = LabColorMath.labToSRGB(white)
-        #expect(rgb.r > 0.9)
-        #expect(rgb.g > 0.9)
-        #expect(rgb.b > 0.9)
+        XCTAssertTrue(rgb.r > 0.9)
+        XCTAssertTrue(rgb.g > 0.9)
+        XCTAssertTrue(rgb.b > 0.9)
     }
 
-    @Test("Standard CIEDE2000 vector (Sharma)")
-    func ciede2000() {
+    func testCiede2000() {
         let a = LabColor(l: 50, a: -1.3802, b: -84.2814)
         let b = LabColor(l: 50, a: 0.0000, b: -82.7485)
-        #expect(abs(ColorDifference.deltaE00(a, b) - 1.00) < 0.001)
+        XCTAssertTrue(abs(ColorDifference.deltaE00(a, b) - 1.00) < 0.001)
     }
 
-    @Test("Classification respects thresholds")
-    func classify() {
-        #expect(ColorDifference.classify(deltaE: 0.5, goodMax: 2.0, warningMax: 5.0) == .good)
-        #expect(ColorDifference.classify(deltaE: 3.0, goodMax: 2.0, warningMax: 5.0) == .warning)
-        #expect(ColorDifference.classify(deltaE: 6.0, goodMax: 2.0, warningMax: 5.0) == .bad)
+    func testClassify() {
+        XCTAssertEqual(ColorDifference.classify(deltaE: 0.5, goodMax: 2.0, warningMax: 5.0), .good)
+        XCTAssertEqual(ColorDifference.classify(deltaE: 3.0, goodMax: 2.0, warningMax: 5.0), .warning)
+        XCTAssertEqual(ColorDifference.classify(deltaE: 6.0, goodMax: 2.0, warningMax: 5.0), .bad)
     }
 }
 
-@Suite("MeasurementArtefacts")
-struct MeasurementArtefactTests {
+final class MeasurementArtefactTests: XCTestCase {
 
     private func makeCwd() throws -> URL {
         let url = FileManager.default.temporaryDirectory
@@ -261,8 +232,7 @@ struct MeasurementArtefactTests {
         return url
     }
 
-    @Test("Discovers passes in order")
-    func discovery() throws {
+    func testDiscovery() throws {
         let cwd = try makeCwd()
         defer { try? FileManager.default.removeItem(at: cwd) }
 
@@ -271,11 +241,10 @@ struct MeasurementArtefactTests {
         try "C".write(to: cwd.appendingPathComponent("target_pass10.ti3"), atomically: true, encoding: .utf8)
 
         let passes = MeasurementArtefacts.passSnapshots(basename: "target", cwd: cwd)
-        #expect(passes.map(\.lastPathComponent) == ["target_pass1.ti3", "target_pass3.ti3", "target_pass10.ti3"])
+        XCTAssertEqual(passes.map(\.lastPathComponent), ["target_pass1.ti3", "target_pass3.ti3", "target_pass10.ti3"])
     }
 
-    @Test("Snapshot and promote are atomic")
-    func snapshotPromote() throws {
+    func testSnapshotPromote() throws {
         let cwd = try makeCwd()
         defer { try? FileManager.default.removeItem(at: cwd) }
 
@@ -283,16 +252,15 @@ struct MeasurementArtefactTests {
         try "canonical".write(to: canonical, atomically: true, encoding: .utf8)
 
         let pass = try MeasurementArtefacts.snapshotPass(basename: "target", cwd: cwd)
-        #expect(pass.lastPathComponent == "target_pass1.ti3")
-        #expect(!FileManager.default.fileExists(atPath: canonical.path))
+        XCTAssertEqual(pass.lastPathComponent, "target_pass1.ti3")
+        XCTAssertFalse(FileManager.default.fileExists(atPath: canonical.path))
 
         let promoted = try MeasurementArtefacts.promotePass(pass: pass, basename: "target", cwd: cwd)
-        #expect(promoted.lastPathComponent == "target.ti3")
-        #expect(FileManager.default.fileExists(atPath: promoted.path))
+        XCTAssertEqual(promoted.lastPathComponent, "target.ti3")
+        XCTAssertTrue(FileManager.default.fileExists(atPath: promoted.path))
     }
 
-    @Test("Pass collisions handled")
-    func collision() throws {
+    func testCollision() throws {
         let cwd = try makeCwd()
         defer { try? FileManager.default.removeItem(at: cwd) }
 
@@ -302,28 +270,25 @@ struct MeasurementArtefactTests {
 
         try "v2".write(to: canonical, atomically: true, encoding: .utf8)
         let pass2 = try MeasurementArtefacts.snapshotPass(basename: "target", cwd: cwd)
-        #expect(pass2.lastPathComponent == "target_pass2.ti3")
+        XCTAssertEqual(pass2.lastPathComponent, "target_pass2.ti3")
     }
 }
 
-@Suite("AverageArgs")
-struct AverageArgsTests {
+final class AverageArgsTests: XCTestCase {
 
-    @Test("Requires at least two pass files")
-    func passCount() {
+    func testPassCount() {
         let cwd = URL(fileURLWithPath: "/tmp")
         let config = AverageConfig(
             workingDirectory: cwd,
             basename: "target",
             passFiles: [URL(fileURLWithPath: "target_pass1.ti3")]
         )
-        #expect(throws: AverageArgError.self) {
-            _ = try AverageArgs.build(config: config)
+        XCTAssertThrowsError(try AverageArgs.build(config: config)) { error in
+            XCTAssertTrue(error is AverageArgError)
         }
     }
 
-    @Test("Output is last and inputs are relative")
-    func ordering() throws {
+    func testOrdering() throws {
         let cwd = URL(fileURLWithPath: "/tmp")
         let config = AverageConfig(
             workingDirectory: cwd,
@@ -334,8 +299,8 @@ struct AverageArgsTests {
             ]
         )
         let args = try AverageArgs.build(config: config)
-        #expect(args.first == "-v")
-        #expect(args.last == "target.ti3")
-        #expect(args == ["-v", "target_pass1.ti3", "target_pass2.ti3", "target.ti3"])
+        XCTAssertEqual(args.first, "-v")
+        XCTAssertEqual(args.last, "target.ti3")
+        XCTAssertEqual(args, ["-v", "target_pass1.ti3", "target_pass2.ti3", "target.ti3"])
     }
 }

Tests/ICCeryCoreTests/PresetTests.swift

@@ -1,116 +1,98 @@
-import Testing
 import Foundation
+import XCTest
 @testable import ICCeryCore
 
-@Suite("ProfilingPreset")
-struct ProfilingPresetTests {
+final class ProfilingPresetTests: XCTestCase {
 
-    @Test("snake_case keys round-trip through Codable")
-    func roundTrip() throws {
+    func testRoundTrip() throws {
         var p = PresetCatalog.highQualityCMYK
         p.colprofInputViewingCond = "D50_2"
         let data = try JSONEncoder().encode(p)
         let decoded = try JSONDecoder().decode(ProfilingPreset.self, from: data)
-        #expect(decoded == p)
+        XCTAssertEqual(decoded, p)
         // Spot-check the wire format.
         let obj = try JSONSerialization.jsonObject(with: data) as! [String: Any]
-        #expect(obj["colour_space"] as? String == "cmyk")
-        #expect(obj["patch_count"] as? Int == 1500)
-        #expect(obj["total_ink_limit"] as? Int == 320)
-        #expect(obj["bit_depth"] as? Int == 16)
-        #expect(obj["colprof_input_viewing_cond"] as? String == "D50_2")
+        XCTAssertEqual(obj["colour_space"] as? String, "cmyk")
+        XCTAssertEqual(obj["patch_count"] as? Int, 1500)
+        XCTAssertEqual(obj["total_ink_limit"] as? Int, 320)
+        XCTAssertEqual(obj["bit_depth"] as? Int, 16)
+        XCTAssertEqual(obj["colprof_input_viewing_cond"] as? String, "D50_2")
     }
 
-    @Test("Unknown keys ignored; missing required field fails")
-    func schemaTolerance() throws {
+    func testSchemaTolerance() throws {
         let json = """
         {"id":"x","name":"N","colour_space":"rgb","patch_count":10,
          "white_patches":1,"black_patches":1,"instrument":"i1",
          "page_size":"A4","bit_depth":8,"dpi":300,"future_key":42}
         """.data(using: .utf8)!
         let ok = try JSONDecoder().decode(ProfilingPreset.self, from: json)
-        #expect(ok.id == "x")
+        XCTAssertEqual(ok.id, "x")
 
         let missing = """
         {"id":"x","name":"N","colour_space":"rgb"}
         """.data(using: .utf8)!
-        #expect(throws: DecodingError.self) {
-            try JSONDecoder().decode(ProfilingPreset.self, from: missing)
-        }
+        XCTAssertThrowsError(try JSONDecoder().decode(ProfilingPreset.self, from: missing)) { error in XCTAssertTrue(error is DecodingError) }
     }
 
-    @Test("Validation rejects bad colour space / dpi / bit depth")
-    func validation() {
-        #expect(throws: ProfilingPreset.ValidationError.self) {
-            try ProfilingPreset(id: "a", name: "n", colourSpace: "lab").validated()
-        }
-        #expect(throws: ProfilingPreset.ValidationError.self) {
-            try ProfilingPreset(id: "a", name: "n", dpi: 10).validated()
-        }
-        #expect(throws: ProfilingPreset.ValidationError.self) {
-            try ProfilingPreset(id: "a", name: "n", bitDepth: 12).validated()
-        }
-        #expect(throws: ProfilingPreset.ValidationError.self) {
-            try ProfilingPreset(id: "a", name: "n", patchCount: 0).validated()
-        }
+    func testValidation() {
+        XCTAssertThrowsError(try ProfilingPreset(id: "a", name: "n", colourSpace: "lab").validated()) { error in XCTAssertTrue(error is ProfilingPreset.ValidationError) }
+        XCTAssertThrowsError(try ProfilingPreset(id: "a", name: "n", dpi: 10).validated()) { error in XCTAssertTrue(error is ProfilingPreset.ValidationError) }
+        XCTAssertThrowsError(try ProfilingPreset(id: "a", name: "n", bitDepth: 12).validated()) { error in XCTAssertTrue(error is ProfilingPreset.ValidationError) }
+        XCTAssertThrowsError(try ProfilingPreset(id: "a", name: "n", patchCount: 0).validated()) { error in XCTAssertTrue(error is ProfilingPreset.ValidationError) }
     }
 }
 
-@Suite("PresetCatalog")
-struct PresetCatalogTests {
+final class PresetCatalogTests: XCTestCase {
 
-    @Test("Four built-ins with the documented values")
-    func builtIns() {
-        #expect(PresetCatalog.builtIns.count == 4)
+    func testBuiltIns() {
+        XCTAssertEqual(PresetCatalog.builtIns.count, 4)
         let byID = Dictionary(uniqueKeysWithValues: PresetCatalog.builtIns.map { ($0.id, $0) })
 
         let std = byID["preset-std-rgb"]!
-        #expect(std.colourSpace == "rgb" && std.patchCount == 800
+        XCTAssertTrue(std.colourSpace == "rgb" && std.patchCount == 800
                 && std.pageSize == "A4" && std.bitDepth == 8
                 && std.dpi == 300 && std.colprofQuality == "m"
                 && std.whitePatches == 4 && std.blackPatches == 4)
 
         let hq = byID["preset-hq-cmyk"]!
-        #expect(hq.colourSpace == "cmyk" && hq.patchCount == 1500
+        XCTAssertTrue(hq.colourSpace == "cmyk" && hq.patchCount == 1500
                 && hq.pageSize == "A3" && hq.bitDepth == 16
                 && hq.dpi == 300 && hq.colprofQuality == "h"
                 && hq.totalInkLimit == 320 && hq.blackPatches == 8)
 
         let draft = byID["preset-draft-rgb"]!
-        #expect(draft.colourSpace == "rgb" && draft.patchCount == 400
+        XCTAssertTrue(draft.colourSpace == "rgb" && draft.patchCount == 400
                 && draft.pageSize == "A4" && draft.bitDepth == 8
                 && draft.dpi == 150 && draft.colprofQuality == "l")
 
         let ultra = byID["preset-ultra-rgb"]!
-        #expect(ultra.colourSpace == "rgb" && ultra.patchCount == 2500
+        XCTAssertTrue(ultra.colourSpace == "rgb" && ultra.patchCount == 2500
                 && ultra.pageSize == "A3" && ultra.bitDepth == 16
                 && ultra.dpi == 300 && ultra.colprofQuality == "u"
                 && ultra.ofpsHighQuality == true
                 && ultra.whitePatches == 6 && ultra.blackPatches == 6)
 
         for p in PresetCatalog.builtIns {
-            #expect(p.instrument == "i1")
-            #expect(p.colprofFwa == "D50")
-            #expect(p.randomSeed == 1)
-            #expect(p.noRandomize == false)
-            #expect(p.colprofAlgorithm == "l")
+            XCTAssertEqual(p.instrument, "i1")
+            XCTAssertEqual(p.colprofFwa, "D50")
+            XCTAssertEqual(p.randomSeed, 1)
+            XCTAssertEqual(p.noRandomize, false)
+            XCTAssertEqual(p.colprofAlgorithm, "l")
         }
     }
 
-    @Test("Custom presets overlay by id; built-ins are not deletable")
-    func overlay() {
+    func testOverlay() {
         let custom = ProfilingPreset(
             id: "preset-std-rgb", name: "Shadowed", patchCount: 42)
         let all = PresetCatalog.all(custom: [custom])
-        #expect(all.count == 4)
-        #expect(all.first { $0.id == "preset-std-rgb" }?.patchCount == 42)
-        #expect(PresetCatalog.isBuiltIn("preset-std-rgb"))
-        #expect(!PresetCatalog.isBuiltIn("custom-1"))
+        XCTAssertEqual(all.count, 4)
+        XCTAssertEqual(all.first { $0.id == "preset-std-rgb" }?.patchCount, 42)
+        XCTAssertTrue(PresetCatalog.isBuiltIn("preset-std-rgb"))
+        XCTAssertFalse(PresetCatalog.isBuiltIn("custom-1"))
     }
 }
 
-@Suite("PresetStore")
-struct PresetStoreTests {
+final class PresetStoreTests: XCTestCase {
 
     private func tempSettingsURL() throws -> URL {
         let dir = FileManager.default.temporaryDirectory
@@ -119,58 +101,52 @@ struct PresetStoreTests {
         return dir.appendingPathComponent("settings.json")
     }
 
-    @Test("CRUD + export/import round-trip")
-    func crud() throws {
+    func testCrud() throws {
         let url = try tempSettingsURL()
         defer { try? FileManager.default.removeItem(at: url.deletingLastPathComponent()) }
         let store = PresetStore(settingsStore: SettingsStore(fileURL: url))
 
         var p = ProfilingPreset(id: "custom-x", name: "Mine", patchCount: 999, dpi: 150)
         try store.saveCustom(p)
-        #expect(store.customs().count == 1)
-        #expect(store.all().count == 5)
+        XCTAssertEqual(store.customs().count, 1)
+        XCTAssertEqual(store.all().count, 5)
 
         p.name = "Renamed"
         try store.saveCustom(p)
-        #expect(store.customs().count == 1)
-        #expect(store.customs()[0].name == "Renamed")
+        XCTAssertEqual(store.customs().count, 1)
+        XCTAssertEqual(store.customs()[0].name, "Renamed")
 
         let data = try store.export(p)
         let imported = try store.import(data)
-        #expect(imported.name == "Renamed")
-        #expect(imported.dpi == 150)
+        XCTAssertEqual(imported.name, "Renamed")
+        XCTAssertEqual(imported.dpi, 150)
 
-        #expect(try store.deleteCustom(id: "custom-x"))
-        #expect(store.customs().isEmpty)
-        #expect(try !store.deleteCustom(id: "preset-std-rgb"))
+        XCTAssertTrue(try store.deleteCustom(id: "custom-x"))
+        XCTAssertTrue(store.customs().isEmpty)
+        XCTAssertFalse(try store.deleteCustom(id: "preset-std-rgb"))
     }
 
-    @Test("Import rewrites a built-in id to a fresh custom id")
-    func importBuiltinCollision() throws {
+    func testImportBuiltinCollision() throws {
         let url = try tempSettingsURL()
         defer { try? FileManager.default.removeItem(at: url.deletingLastPathComponent()) }
         let store = PresetStore(settingsStore: SettingsStore(fileURL: url))
         let data = try store.export(PresetCatalog.standardRGB)
         let imported = try store.import(data)
-        #expect(imported.id.hasPrefix("custom-"))
-        #expect(!PresetCatalog.isBuiltIn(imported.id))
+        XCTAssertTrue(imported.id.hasPrefix("custom-"))
+        XCTAssertFalse(PresetCatalog.isBuiltIn(imported.id))
     }
 
-    @Test("Built-ins are immutable through saveCustom")
-    func builtInImmutable() throws {
+    func testBuiltInImmutable() throws {
         let url = try tempSettingsURL()
         defer { try? FileManager.default.removeItem(at: url.deletingLastPathComponent()) }
         let store = PresetStore(settingsStore: SettingsStore(fileURL: url))
         var shadowed = PresetCatalog.standardRGB
         shadowed.name = "Hacked"
-        #expect(throws: PresetStore.PresetStoreError.self) {
-            try store.saveCustom(shadowed)
-        }
+        XCTAssertThrowsError(try store.saveCustom(shadowed)) { error in XCTAssertTrue(error is PresetStore.PresetStoreError) }
     }
 }
 
-@Suite("AppSettings preset migration")
-struct PresetMigrationTests {
+final class PresetMigrationTests: XCTestCase {
 
     private func tempSettingsURL() throws -> URL {
         let dir = FileManager.default.temporaryDirectory
@@ -179,8 +155,7 @@ struct PresetMigrationTests {
         return dir.appendingPathComponent("settings.json")
     }
 
-    @Test("Legacy M1 custom_presets migrate to typed schema")
-    func legacyMigration() throws {
+    func testLegacyMigration() throws {
         let url = try tempSettingsURL()
         defer { try? FileManager.default.removeItem(at: url.deletingLastPathComponent()) }
         let legacy = """
@@ -194,20 +169,19 @@ struct PresetMigrationTests {
         try legacy.write(to: url)
 
         let settings = SettingsStore(fileURL: url).load()
-        #expect(settings.customPresets.count == 1)
+        XCTAssertEqual(settings.customPresets.count, 1)
         let p = settings.customPresets[0]
-        #expect(p.name == "Old One")
-        #expect(p.id.hasPrefix("custom-0-"))
-        #expect(p.colourSpace == "cmyk")
-        #expect(p.patchCount == 900)
-        #expect(p.dpi == 150)
-        #expect(p.bitDepth == 16)
-        #expect(p.instrument == "p3")
-        #expect(p.pageSize == "A3")
+        XCTAssertEqual(p.name, "Old One")
+        XCTAssertTrue(p.id.hasPrefix("custom-0-"))
+        XCTAssertEqual(p.colourSpace, "cmyk")
+        XCTAssertEqual(p.patchCount, 900)
+        XCTAssertEqual(p.dpi, 150)
+        XCTAssertEqual(p.bitDepth, 16)
+        XCTAssertEqual(p.instrument, "p3")
+        XCTAssertEqual(p.pageSize, "A3")
     }
 
-    @Test("Typed presets load and re-save as the typed schema")
-    func typedRoundTrip() throws {
+    func testTypedRoundTrip() throws {
         let url = try tempSettingsURL()
         defer { try? FileManager.default.removeItem(at: url.deletingLastPathComponent()) }
         let store = SettingsStore(fileURL: url)
@@ -215,50 +189,45 @@ struct PresetMigrationTests {
         s.customPresets = [ProfilingPreset(id: "c1", name: "C1", patchCount: 700)]
         try store.save(s)
         let loaded = store.load()
-        #expect(loaded.customPresets.first?.patchCount == 700)
+        XCTAssertEqual(loaded.customPresets.first?.patchCount, 700)
     }
 
-    @Test("Draft preset dpi=150 survives Codable + settings round-trip")
-    func draftDPI() throws {
+    func testDraftDPI() throws {
         let url = try tempSettingsURL()
         defer { try? FileManager.default.removeItem(at: url.deletingLastPathComponent()) }
         let store = PresetStore(settingsStore: SettingsStore(fileURL: url))
         let data = try store.export(PresetCatalog.draftRGB)
         let obj = try JSONSerialization.jsonObject(with: data) as! [String: Any]
-        #expect(obj["dpi"] as? Int == 150)
+        XCTAssertEqual(obj["dpi"] as? Int, 150)
         let back = try store.import(data)
-        #expect(back.dpi == 150)
+        XCTAssertEqual(back.dpi, 150)
     }
 }
 
-@Suite("Preset mapping")
-struct PresetMappingTests {
-    @Test("Draft 150 DPI maps into PrinttargConfig")
-    func draftDpi() {
+final class PresetMappingTests: XCTestCase {
+    func testDraftDpi() {
         let cfg = PrinttargConfig(
             preset: PresetCatalog.draftRGB,
             basename: "t",
             workingDirectory: nil,
             calibrationFile: nil
         )
-        #expect(cfg.dpi == 150)
-        #expect(cfg.layoutOrder == .deterministic)
+        XCTAssertEqual(cfg.dpi, 150)
+        XCTAssertEqual(cfg.layoutOrder, .deterministic)
     }
 
-    @Test("Nil optional targen fields stay nil")
-    func optionalNil() {
+    func testOptionalNil() {
         let preset = ProfilingPreset(id: "x", name: "n", patchCount: 800)
         let cfg = TargenConfig(preset: preset, basename: "t", workingDirectory: nil)
-        #expect(cfg.greySteps == nil)
-        #expect(cfg.singleChannelSteps == nil)
-        #expect(cfg.neutralSteps == nil)
-        #expect(cfg.totalInkLimit == nil)
-        #expect(cfg.darkEmphasis == nil)
-        #expect(cfg.devicePower == nil)
+        XCTAssertNil(cfg.greySteps)
+        XCTAssertNil(cfg.singleChannelSteps)
+        XCTAssertNil(cfg.neutralSteps)
+        XCTAssertNil(cfg.totalInkLimit)
+        XCTAssertNil(cfg.darkEmphasis)
+        XCTAssertNil(cfg.devicePower)
     }
 
-    @Test("Custom page and FWA survive a config round-trip")
-    func roundTripConfigs() {
+    func testRoundTripConfigs() {
         var preset = PresetCatalog.highQualityCMYK
         preset.pageSize = "210x297"
         preset.colprofFwa = "D50"
@@ -268,9 +237,9 @@ struct PresetMappingTests {
             preset: preset, basename: "job", workingDirectory: nil, calibrationFile: nil
         )
         let colprof = ColprofConfig(preset: preset, basename: "job", workingDirectory: nil)
-        #expect(printtarg.pageSize == .custom)
-        #expect(printtarg.customPageWidth == 210)
-        #expect(colprof.fwa == "D50")
+        XCTAssertEqual(printtarg.pageSize, .custom)
+        XCTAssertEqual(printtarg.customPageWidth, 210)
+        XCTAssertEqual(colprof.fwa, "D50")
         let back = ProfilingPreset(
             id: preset.id,
             name: preset.name,
@@ -281,15 +250,14 @@ struct PresetMappingTests {
             calibrationFile: preset.calibrationFile,
             applyCalibration: preset.applyCalibration
         )
-        #expect(back.dpi == preset.dpi)
-        #expect(back.colourSpace == "cmyk")
-        #expect(back.pageSize == "210x297")
-        #expect(back.colprofFwa == "D50")
-        #expect(back.greySteps == nil)
+        XCTAssertEqual(back.dpi, preset.dpi)
+        XCTAssertEqual(back.colourSpace, "cmyk")
+        XCTAssertEqual(back.pageSize, "210x297")
+        XCTAssertEqual(back.colprofFwa, "D50")
+        XCTAssertNil(back.greySteps)
     }
 
-    @Test("Full preset round-trips through all three configs with every field asserted")
-    func fullRoundTrip() {
+    func testFullRoundTrip() {
         let preset = ProfilingPreset(
             id: "custom-full",
             name: "Full",
@@ -328,21 +296,21 @@ struct PresetMappingTests {
         )
 
         let targen = TargenConfig(preset: preset, basename: "j", workingDirectory: nil)
-        #expect(targen.colourSpace == .cmyk)
-        #expect(targen.patchCount == 1500)
-        #expect(targen.whitePatches == 6)
-        #expect(targen.blackPatches == 8)
-        #expect(targen.greySteps == 9)
-        #expect(targen.singleChannelSteps == 7)
-        #expect(targen.neutralSteps == 4)
-        #expect(targen.neutralConcentration == 0.7)
-        #expect(targen.preconditioningProfile == "/tmp/pre.icm")
-        #expect(targen.ofpsHighQuality == true)
-        #expect(targen.ofpsAdaptation == 0.2)
-        #expect(targen.fullSpreadAlgorithm == .uniformRandom)
-        #expect(targen.totalInkLimit == 280)
-        #expect(targen.darkEmphasis == 1.3)
-        #expect(targen.devicePower == 1.2)
+        XCTAssertEqual(targen.colourSpace, .cmyk)
+        XCTAssertEqual(targen.patchCount, 1500)
+        XCTAssertEqual(targen.whitePatches, 6)
+        XCTAssertEqual(targen.blackPatches, 8)
+        XCTAssertEqual(targen.greySteps, 9)
+        XCTAssertEqual(targen.singleChannelSteps, 7)
+        XCTAssertEqual(targen.neutralSteps, 4)
+        XCTAssertEqual(targen.neutralConcentration, 0.7)
+        XCTAssertEqual(targen.preconditioningProfile, "/tmp/pre.icm")
+        XCTAssertEqual(targen.ofpsHighQuality, true)
+        XCTAssertEqual(targen.ofpsAdaptation, 0.2)
+        XCTAssertEqual(targen.fullSpreadAlgorithm, .uniformRandom)
+        XCTAssertEqual(targen.totalInkLimit, 280)
+        XCTAssertEqual(targen.darkEmphasis, 1.3)
+        XCTAssertEqual(targen.devicePower, 1.2)
 
         let printtarg = PrinttargConfig(
             preset: preset,
@@ -350,25 +318,25 @@ struct PresetMappingTests {
             workingDirectory: nil,
             calibrationFile: preset.calibrationFile
         )
-        #expect(printtarg.instrument == .p3)
-        #expect(printtarg.pageSize == .custom)
-        #expect(printtarg.customPageWidth == 250)
-        #expect(printtarg.customPageHeight == 300)
-        #expect(printtarg.bitDepth == .sixteen)
-        #expect(printtarg.dpi == 360)
-        #expect(printtarg.layoutOrder == .customSeed)
-        #expect(printtarg.customSeed == 42)
-        #expect(printtarg.calibrationFile == "/tmp/a.cal")
+        XCTAssertEqual(printtarg.instrument, .p3)
+        XCTAssertEqual(printtarg.pageSize, .custom)
+        XCTAssertEqual(printtarg.customPageWidth, 250)
+        XCTAssertEqual(printtarg.customPageHeight, 300)
+        XCTAssertEqual(printtarg.bitDepth, .sixteen)
+        XCTAssertEqual(printtarg.dpi, 360)
+        XCTAssertEqual(printtarg.layoutOrder, .customSeed)
+        XCTAssertEqual(printtarg.customSeed, 42)
+        XCTAssertEqual(printtarg.calibrationFile, "/tmp/a.cal")
 
         let colprof = ColprofConfig(preset: preset, basename: "j", workingDirectory: nil)
-        #expect(colprof.algorithm == "x")
-        #expect(colprof.quality == "u")
-        #expect(colprof.intent == "p")
-        #expect(colprof.fwa == "D65")
-        #expect(colprof.illuminant == "D65")
-        #expect(colprof.observer == "1931_2")
-        #expect(colprof.inputViewingCond == "D50_2")
-        #expect(colprof.outputViewingCond == "D65_2")
+        XCTAssertEqual(colprof.algorithm, "x")
+        XCTAssertEqual(colprof.quality, "u")
+        XCTAssertEqual(colprof.intent, "p")
+        XCTAssertEqual(colprof.fwa, "D65")
+        XCTAssertEqual(colprof.illuminant, "D65")
+        XCTAssertEqual(colprof.observer, "1931_2")
+        XCTAssertEqual(colprof.inputViewingCond, "D50_2")
+        XCTAssertEqual(colprof.outputViewingCond, "D65_2")
 
         let back = ProfilingPreset(
             id: preset.id,
@@ -380,11 +348,12 @@ struct PresetMappingTests {
             calibrationFile: preset.calibrationFile,
             applyCalibration: preset.applyCalibration
         )
-        #expect(back == preset)
+        XCTAssertEqual(back, preset)
     }
 
-    @Test("Every full-spread algorithm round-trips", arguments: [
-        ("ofps", FullSpreadAlgorithm.ofps),
+    func testFullSpreadAlgorithms() {
+        let cases: [(String, FullSpreadAlgorithm)] = [
+            ("ofps", .ofps),
             ("t", .target),
             ("r", .random),
             ("R", .uniformRandom),
@@ -392,16 +361,16 @@ struct PresetMappingTests {
             ("Q", .uniformQuasiRandom),
             ("i", .invertedQuasiRandom),
             ("I", .invertedUniformQuasiRandom)
-    ])
-    func fullSpreadAlgorithms(value: String, expected: FullSpreadAlgorithm) {
+        ]
+        for (value, expected) in cases {
             var preset = ProfilingPreset(id: "x", name: "n", patchCount: 100)
             preset.fullSpreadAlgorithm = value
             let cfg = TargenConfig(preset: preset, basename: "t", workingDirectory: nil)
             if expected == .ofps {
                 // ofps is the default — no flag emitted, stored value is nil.
-            #expect(cfg.fullSpreadAlgorithm == nil)
+                XCTAssertNil(cfg.fullSpreadAlgorithm)
             } else {
-            #expect(cfg.fullSpreadAlgorithm == expected)
+                XCTAssertEqual(cfg.fullSpreadAlgorithm, expected)
             }
             let back = ProfilingPreset(
                 id: "x", name: "n", description: "",
@@ -414,30 +383,31 @@ struct PresetMappingTests {
                 calibrationFile: nil,
                 applyCalibration: nil
             )
-        #expect(back.fullSpreadAlgorithm == value)
+            XCTAssertEqual(back.fullSpreadAlgorithm, value)
+        }
     }
 
-    @Test("Explicit ofpsHighQuality=false is preserved, distinct from nil")
-    func ofpsHighQualityFalse() {
+    func testOfpsHighQualityFalse() {
         var preset = ProfilingPreset(id: "x", name: "n", patchCount: 100)
         preset.ofpsHighQuality = false
         let cfg = TargenConfig(preset: preset, basename: "t", workingDirectory: nil)
-        #expect(cfg.ofpsHighQuality == false)
+        XCTAssertEqual(cfg.ofpsHighQuality, false)
 
         preset.ofpsHighQuality = nil
         let nilCfg = TargenConfig(preset: preset, basename: "t", workingDirectory: nil)
-        #expect(nilCfg.ofpsHighQuality == nil)
+        XCTAssertNil(nilCfg.ofpsHighQuality)
     }
 
-    @Test("noRandomize/seed layout mapping rules", arguments: [
-        (true, nil, LayoutOrder.raster, 1),
+    func testLayoutMapping() {
+        let cases: [(Bool?, Int?, LayoutOrder, Int)] = [
+            (true, nil, .raster, 1),
             (true, 7, .raster, 7),
             (false, nil, .deterministic, 1),
             (false, 1, .deterministic, 1),
             (nil, 1, .deterministic, 1),
             (false, 5, .customSeed, 5)
-    ] as [(Bool?, Int?, LayoutOrder, Int)])
-    func layoutMapping(noRandomize: Bool?, seed: Int?, layout: LayoutOrder, expectedSeed: Int) {
+        ]
+        for (noRandomize, seed, layout, expectedSeed) in cases {
             var preset = ProfilingPreset(id: "x", name: "n", patchCount: 100)
             preset.noRandomize = noRandomize
             preset.randomSeed = seed
@@ -445,31 +415,35 @@ struct PresetMappingTests {
                 preset: preset, basename: "t",
                 workingDirectory: nil, calibrationFile: nil
             )
-        #expect(cfg.layoutOrder == layout)
-        #expect(cfg.customSeed == expectedSeed)
+            XCTAssertEqual(cfg.layoutOrder, layout)
+            XCTAssertEqual(cfg.customSeed, expectedSeed)
+        }
     }
 
-    @Test("Custom page fallback matrix", arguments: [
-        ("250x300", PageSize.custom, 250.0, 300.0),
+    func testCustomPageFallback() {
+        let cases: [(String, PageSize, Double, Double)] = [
+            ("250x300", .custom, 250.0, 300.0),
             ("50x50", .custom, 50.0, 50.0),
             ("foo", .a4, 210.0, 297.0),
             ("30x40", .a4, 210.0, 297.0),
             ("210x", .a4, 210.0, 297.0)
-    ] as [(String, PageSize, Double, Double)])
-    func customPageFallback(raw: String, page: PageSize, w: Double, h: Double) {
+        ]
+        for (raw, page, w, h) in cases {
             var preset = ProfilingPreset(id: "x", name: "n", patchCount: 100)
             preset.pageSize = raw
             let cfg = PrinttargConfig(
                 preset: preset, basename: "t",
                 workingDirectory: nil, calibrationFile: nil
             )
-        #expect(cfg.pageSize == page)
-        #expect(cfg.customPageWidth == w)
-        #expect(cfg.customPageHeight == h)
+            XCTAssertEqual(cfg.pageSize, page)
+            XCTAssertEqual(cfg.customPageWidth, w)
+            XCTAssertEqual(cfg.customPageHeight, h)
+        }
     }
 
-    @Test("FWA preset value → selection matrix", arguments: [
-        (nil, ColprofFwaSelection.none),
+    func testFwaToSelection() {
+        let cases: [(String?, ColprofFwaSelection)] = [
+            (nil, .none),
             ("none", .none),
             ("NONE", .none),
             ("", .empty),
@@ -478,19 +452,22 @@ struct PresetMappingTests {
             ("D65", .D65),
             ("d65", .D65),
             ("/tmp/fwa.sp", .custom)
-    ] as [(String?, ColprofFwaSelection)])
-    func fwaToSelection(raw: String?, expected: ColprofFwaSelection) {
-        #expect(ColprofFwaSelection(presetValue: raw) == expected)
+        ]
+        for (raw, expected) in cases {
+            XCTAssertEqual(ColprofFwaSelection(presetValue: raw), expected)
+        }
     }
 
-    @Test("FWA selection → preset value matrix", arguments: [
-        (ColprofFwaSelection.none, nil),
+    func testFwaToPresetValue() {
+        let cases: [(ColprofFwaSelection, String?)] = [
+            (.none, nil),
             (.empty, ""),
             (.D50, "D50"),
             (.D65, "D65"),
             (.custom, "/tmp/fwa.sp")
-    ] as [(ColprofFwaSelection, String?)])
-    func fwaToPresetValue(selection: ColprofFwaSelection, expected: String?) {
-        #expect(selection.presetValue(customPath: "/tmp/fwa.sp") == expected)
+        ]
+        for (selection, expected) in cases {
+            XCTAssertEqual(selection.presetValue(customPath: "/tmp/fwa.sp"), expected)
+        }
     }
 }

Tests/ICCeryCoreTests/PresetViewModelMappingTests.swift

@@ -1,21 +1,19 @@
-import Testing
 import Foundation
+import XCTest
 @testable import ICCeryCore
 @testable import ICCery
 
 /// Issue #82 — preset application through the live view models, under an
 /// isolated `TestAppEnvironment` (temp stores, fresh ProcessManager).
-@Suite("PresetViewModelMapping")
 @MainActor
-struct PresetViewModelMappingTests {
+final class PresetViewModelMappingTests: XCTestCase {
 
     private func makeWorkflow() throws -> (TestAppEnvironment, TargetWorkflowViewModel) {
         let env = try TestAppEnvironment.make()
         return (env, TargetWorkflowViewModel(environment: env.environment))
     }
 
-    @Test("Applying a nil-FWA preset after a custom FWA clears the stale path")
-    func nilFwaClearsCustomPath() throws {
+    func testNilFwaClearsCustomPath() throws {
         let (env, vm) = try makeWorkflow()
         defer { env.cleanup() }
 
@@ -24,18 +22,17 @@ struct PresetViewModelMappingTests {
             colprofFwa: "/tmp/fwa.sp"
         )
         vm.applyPreset(customPreset)
-        #expect(vm.profile.fwaSelection == .custom)
-        #expect(vm.profile.fwaCustomPath == "/tmp/fwa.sp")
+        XCTAssertEqual(vm.profile.fwaSelection, .custom)
+        XCTAssertEqual(vm.profile.fwaCustomPath, "/tmp/fwa.sp")
 
         customPreset.colprofFwa = nil
         vm.applyPreset(customPreset)
-        #expect(vm.profile.fwaSelection == .none)
-        #expect(vm.profile.fwaCustomPath == "")
-        #expect(vm.profile.fwaValue == nil)
+        XCTAssertEqual(vm.profile.fwaSelection, .none)
+        XCTAssertEqual(vm.profile.fwaCustomPath, "")
+        XCTAssertNil(vm.profile.fwaValue)
     }
 
-    @Test("Custom FWA preset path survives the round-trip to colprof_fwa")
-    func customFwaRoundTrip() throws {
+    func testCustomFwaRoundTrip() throws {
         let (env, vm) = try makeWorkflow()
         defer { env.cleanup() }
 
@@ -44,13 +41,12 @@ struct PresetViewModelMappingTests {
             colprofFwa: "/tmp/other.sp"
         )
         vm.applyPreset(preset)
-        #expect(vm.profile.fwaSelection == .custom)
-        #expect(vm.profile.fwaCustomPath == "/tmp/other.sp")
-        #expect(vm.profile.fwaValue == "/tmp/other.sp")
+        XCTAssertEqual(vm.profile.fwaSelection, .custom)
+        XCTAssertEqual(vm.profile.fwaCustomPath, "/tmp/other.sp")
+        XCTAssertEqual(vm.profile.fwaValue, "/tmp/other.sp")
     }
 
-    @Test("Preset calibration reaches Stage 2 instead of stale live state")
-    func presetCalibrationReachesStage2() throws {
+    func testPresetCalibrationReachesStage2() throws {
         let (env, vm) = try makeWorkflow()
         defer { env.cleanup() }
 
@@ -65,13 +61,12 @@ struct PresetViewModelMappingTests {
         )
         vm.applyPreset(preset)
 
-        #expect(vm.profile.applyCalibration)
-        #expect(vm.profile.calibrationFile == "/tmp/preset.cal")
-        #expect(vm.buildPrinttargConfig().calibrationFile == "/tmp/preset.cal")
+        XCTAssertTrue(vm.profile.applyCalibration)
+        XCTAssertEqual(vm.profile.calibrationFile, "/tmp/preset.cal")
+        XCTAssertEqual(vm.buildPrinttargConfig().calibrationFile, "/tmp/preset.cal")
     }
 
-    @Test("Preset with calibration disabled clears Stage 2 calibration")
-    func disabledCalibrationClearsStage2() throws {
+    func testDisabledCalibrationClearsStage2() throws {
         let (env, vm) = try makeWorkflow()
         defer { env.cleanup() }
 
@@ -85,12 +80,11 @@ struct PresetViewModelMappingTests {
         )
         vm.applyPreset(preset)
 
-        #expect(!vm.profile.applyCalibration)
-        #expect(vm.buildPrinttargConfig().calibrationFile == nil)
+        XCTAssertFalse(vm.profile.applyCalibration)
+        XCTAssertNil(vm.buildPrinttargConfig().calibrationFile)
     }
 
-    @Test("Preset Stage 1/2 form fields apply to the live form")
-    func formFieldsApply() throws {
+    func testFormFieldsApply() throws {
         let (env, vm) = try makeWorkflow()
         defer { env.cleanup() }
 
@@ -106,22 +100,22 @@ struct PresetViewModelMappingTests {
         )
         vm.applyPreset(preset)
 
-        #expect(vm.colourSpace == .cmyk)
-        #expect(vm.effectivePatchCount == 1500)
-        #expect(vm.whitePatches == 6)
-        #expect(vm.blackPatches == 8)
-        #expect(vm.greyStepsEnabled && vm.greySteps == 9)
-        #expect(vm.algorithm == .random)
-        #expect(vm.tiffDpi == 150)
-        #expect(vm.pageSize == .custom)
-        #expect(vm.customPageW == 250 && vm.customPageH == 300)
-        #expect(vm.selectedPresetID == "c-form")
+        XCTAssertEqual(vm.colourSpace, .cmyk)
+        XCTAssertEqual(vm.effectivePatchCount, 1500)
+        XCTAssertEqual(vm.whitePatches, 6)
+        XCTAssertEqual(vm.blackPatches, 8)
+        XCTAssertTrue(vm.greyStepsEnabled && vm.greySteps == 9)
+        XCTAssertEqual(vm.algorithm, .random)
+        XCTAssertEqual(vm.tiffDpi, 150)
+        XCTAssertEqual(vm.pageSize, .custom)
+        XCTAssertTrue(vm.customPageW == 250 && vm.customPageH == 300)
+        XCTAssertEqual(vm.selectedPresetID, "c-form")
 
         // Disabled advanced controls stay nil in the snapshot, not
         // numeric sentinels.
         preset.greySteps = nil
         vm.applyPreset(preset)
-        #expect(!vm.greyStepsEnabled)
-        #expect(vm.buildTargenConfig().greySteps == nil)
+        XCTAssertFalse(vm.greyStepsEnabled)
+        XCTAssertNil(vm.buildTargenConfig().greySteps)
     }
 }

Tests/ICCeryCoreTests/PrintPanelTests.swift

@@ -1,13 +1,12 @@
-import Testing
 import Foundation
+import XCTest
 @testable import ICCeryCore
 @testable import ICCery
 
 /// Issue 13 — panel outcome mapping (cancel → nil, ok → result).
 /// The real `NSPrintPanel` is never run in tests; these exercise the
 /// `UITestHooks` seam the UI tests rely on.
-@Suite("PrintPanelStub")
-struct PrintPanelStubTests {
+final class PrintPanelStubTests: XCTestCase {
 
     private func withEnv(
         _ vars: [String: String?],
@@ -28,19 +27,17 @@ struct PrintPanelStubTests {
         try body()
     }
 
-    @Test("Cancel returns nil — not an error")
-    func cancelIsNil() throws {
+    func testCancelIsNil() throws {
         try withEnv([
             "ICCERY_UI_TESTING": "1",
             "ICCERY_TEST_PRINT_PANEL": "cancel",
         ]) {
-            #expect(UITestHooks.printPanelStubbed)
-            #expect(UITestHooks.printPanelResult(forQueue: "q") == nil)
+            XCTAssertTrue(UITestHooks.printPanelStubbed)
+            XCTAssertNil(UITestHooks.printPanelResult(forQueue: "q"))
         }
     }
 
-    @Test("OK returns captured options + selected printer")
-    func okResult() throws {
+    func testOkResult() throws {
         try withEnv([
             "ICCERY_UI_TESTING": "1",
             "ICCERY_TEST_PRINT_PANEL": "ok",
@@ -48,15 +45,14 @@ struct PrintPanelStubTests {
             "ICCERY_TEST_PANEL_PRINTER": "Other_Queue",
         ]) {
             let result = UITestHooks.printPanelResult(forQueue: "q")
-            #expect(result?.selectedPrinter == "Other_Queue")
-            #expect(result?.options.cupsOptions == "MediaType=Photo InputSlot=Rear")
-            #expect(result?.options.mediaType == "Photo")
-            #expect(result?.options.ppdUncorrectedPassthrough == true)
+            XCTAssertEqual(result?.selectedPrinter, "Other_Queue")
+            XCTAssertEqual(result?.options.cupsOptions, "MediaType=Photo InputSlot=Rear")
+            XCTAssertEqual(result?.options.mediaType, "Photo")
+            XCTAssertEqual(result?.options.ppdUncorrectedPassthrough, true)
         }
     }
 
-    @Test("OK defaults selected printer to the opened queue")
-    func okDefaultsPrinter() throws {
+    func testOkDefaultsPrinter() throws {
         try withEnv([
             "ICCERY_UI_TESTING": "1",
             "ICCERY_TEST_PRINT_PANEL": "ok",
@@ -64,8 +60,8 @@ struct PrintPanelStubTests {
             "ICCERY_TEST_PANEL_PRINTER": nil,
         ]) {
             let result = UITestHooks.printPanelResult(forQueue: "My_Queue")
-            #expect(result?.selectedPrinter == "My_Queue")
-            #expect(result?.options.cupsOptions == nil)
+            XCTAssertEqual(result?.selectedPrinter, "My_Queue")
+            XCTAssertNil(result?.options.cupsOptions)
         }
     }
 }

Tests/ICCeryCoreTests/PrintcalArgsTests.swift

@@ -1,24 +1,21 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("PrintcalArgs")
-struct PrintcalArgsTests {
+final class PrintcalArgsTests: XCTestCase {
 
     private let tmp = URL(fileURLWithPath: "/tmp/out.cal")
 
-    @Test("Default printcal argv")
-    func defaults() throws {
+    func testDefaults() throws {
         let config = PrintcalConfig(
             ti3Basename: "CAL_demo",
             outputURL: tmp
         )
         let args = try PrintcalArgs.build(config: config)
-        #expect(args == ["-v", "-e", "-o", "/tmp/out.cal", "CAL_demo"])
+        XCTAssertEqual(args, ["-v", "-e", "-o", "/tmp/out.cal", "CAL_demo"])
     }
 
-    @Test("All options and channel limits")
-    func allOptions() throws {
+    func testAllOptions() throws {
         let config = PrintcalConfig(
             ti3Basename: "demo",
             outputURL: tmp,
@@ -32,7 +29,7 @@ struct PrintcalArgsTests {
             ]
         )
         let args = try PrintcalArgs.build(config: config)
-        #expect(args == [
+        XCTAssertEqual(args, [
             "-v", "-e",
             "-I", "-z",
             "-a", "/tmp/old.cal",
@@ -44,39 +41,34 @@ struct PrintcalArgsTests {
         ])
     }
 
-    @Test("Whitespace-only previous calibration path emits no -a")
-    func whitespacePreviousCal() throws {
+    func testWhitespacePreviousCal() throws {
         let config = PrintcalConfig(
             ti3Basename: "demo",
             outputURL: tmp,
             previousCalPath: "   \n\t "
         )
         let args = try PrintcalArgs.build(config: config)
-        #expect(!args.contains("-a"))
-        #expect(args == ["-v", "-e", "-o", "/tmp/out.cal", "CAL_demo"])
+        XCTAssertFalse(args.contains("-a"))
+        XCTAssertEqual(args, ["-v", "-e", "-o", "/tmp/out.cal", "CAL_demo"])
     }
 
-    @Test("Previous calibration path is trimmed before emission")
-    func previousCalTrimmed() throws {
+    func testPreviousCalTrimmed() throws {
         let config = PrintcalConfig(
             ti3Basename: "demo",
             outputURL: tmp,
             previousCalPath: "  /tmp/old.cal  "
         )
         let args = try PrintcalArgs.build(config: config)
-        #expect(args[args.firstIndex(of: "-a")! + 1] == "/tmp/old.cal")
+        XCTAssertEqual(args[args.firstIndex(of: "-a")! + 1], "/tmp/old.cal")
     }
 
-    @Test("Rejects invalid per-channel limit")
-    func rejectsBadChannelLimit() {
+    func testRejectsBadChannelLimit() {
         let config = PrintcalConfig(
             ti3Basename: "demo",
             outputURL: tmp,
             channelLimits: [PrintcalChannelLimit(channel: "K", percent: 150)]
         )
-        #expect(throws: (any Error).self) {
-            _ = try PrintcalArgs.build(config: config)
-        }
+        XCTAssertThrowsError(try PrintcalArgs.build(config: config))
     }
 
 }

Tests/ICCeryCoreTests/PrinttargTests.swift

@@ -1,9 +1,8 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 
-@Suite("PrinttargArgs")
-struct PrinttargArgsTests {
+final class PrinttargArgsTests: XCTestCase {
 
     private func config(
         instrument: PrintInstrument = .i1,
@@ -28,136 +27,121 @@ struct PrinttargArgsTests {
         )
     }
 
-    @Test("Baseline: -v -u -i i1 -p A4 -R 1 -t 300")
-    func baseline() throws {
+    func testBaseline() throws {
         let args = try PrinttargArgs.build(config: config())
-        #expect(args == ["-v", "-u", "-i", "i1", "-p", "A4",
+        XCTAssertEqual(args, ["-v", "-u", "-i", "i1", "-p", "A4",
                          "-R", "1", "-t", "300", "target"])
     }
 
-    @Test("Default layout is deterministic -R 1, never bare")
-    func deterministicDefault() throws {
+    func testDeterministicDefault() throws {
         let args = try PrinttargArgs.build(config: config())
-        #expect(args.contains("-R"))
-        #expect(!args.contains("-r"))
-        #expect(args[args.firstIndex(of: "-R")! + 1] == "1")
+        XCTAssertTrue(args.contains("-R"))
+        XCTAssertFalse(args.contains("-r"))
+        XCTAssertEqual(args[args.firstIndex(of: "-R")! + 1], "1")
     }
 
-    @Test("Custom seed -R N; seed < 1 throws")
-    func customSeed() throws {
+    func testCustomSeed() throws {
         let args = try PrinttargArgs.build(config: config(layout: .customSeed, seed: 42))
-        #expect(args[args.firstIndex(of: "-R")! + 1] == "42")
-        #expect(throws: PrinttargArgError.self) {
-            try PrinttargArgs.build(config: config(layout: .customSeed, seed: 0))
+        XCTAssertEqual(args[args.firstIndex(of: "-R")! + 1], "42")
+        XCTAssertThrowsError(try PrinttargArgs.build(config: config(layout: .customSeed, seed: 0))) { error in
+            XCTAssertTrue(error is PrinttargArgError)
         }
     }
 
-    @Test("Raster emits -r and supersedes seed (printtarg -r, not targen -r)")
-    func raster() throws {
+    func testRaster() throws {
         let args = try PrinttargArgs.build(config: config(layout: .raster, seed: 9))
-        #expect(args.contains("-r"))
-        #expect(!args.contains("-R"))
+        XCTAssertTrue(args.contains("-r"))
+        XCTAssertFalse(args.contains("-R"))
     }
 
-    @Test("Label: -d emits the resolved string, not a colour space")
-    func label() throws {
+    func testLabel() throws {
         let args = try PrinttargArgs.build(
             config: config(label: "ICCery - t - P - I - D - A - 01/02/2026 03:04"))
         let i = args.firstIndex(of: "-d")!
-        #expect(args[i + 1].hasPrefix("ICCery - t"))
+        XCTAssertTrue(args[i + 1].hasPrefix("ICCery - t"))
     }
 
-    @Test("Bit depth: -t 8-bit, -T 16-bit; DPI range 72-600")
-    func bitDepthAndDPI() throws {
-        #expect(try PrinttargArgs.build(config: config(bitDepth: .sixteen, dpi: 600))
+    func testBitDepthAndDPI() throws {
+        XCTAssertTrue(try PrinttargArgs.build(config: config(bitDepth: .sixteen, dpi: 600))
             .contains("-T"))
-        #expect(try PrinttargArgs.build(config: config(bitDepth: .eight, dpi: 72))
+        XCTAssertTrue(try PrinttargArgs.build(config: config(bitDepth: .eight, dpi: 72))
             .contains("-t"))
-        #expect(throws: PrinttargArgError.self) {
-            try PrinttargArgs.build(config: config(dpi: 71))
+        XCTAssertThrowsError(try PrinttargArgs.build(config: config(dpi: 71))) { error in
+            XCTAssertTrue(error is PrinttargArgError)
         }
-        #expect(throws: PrinttargArgError.self) {
-            try PrinttargArgs.build(config: config(dpi: 601))
+        XCTAssertThrowsError(try PrinttargArgs.build(config: config(dpi: 601))) { error in
+            XCTAssertTrue(error is PrinttargArgError)
         }
     }
 
-    @Test("All instruments emit their Argyll code")
-    func instruments() throws {
+    func testInstruments() throws {
         let expected: [(PrintInstrument, String)] = [
             (.i1, "i1"), (.p3, "p3"), (.cm, "CM"), (.ss, "SS"),
             (.dtp20, "20"), (.dtp22, "22"), (.dtp41, "41"), (.dtp51, "51"),
         ]
         for (inst, code) in expected {
             let args = try PrinttargArgs.build(config: config(instrument: inst))
-            #expect(args[args.firstIndex(of: "-i")! + 1] == code)
+            XCTAssertEqual(args[args.firstIndex(of: "-i")! + 1], code)
         }
     }
 
-    @Test("All fixed page sizes; custom emits WxH in mm")
-    func pageSizes() throws {
+    func testPageSizes() throws {
         for size in PageSize.allCases where size != .custom {
             let args = try PrinttargArgs.build(config: config(pageSize: size))
-            #expect(args[args.firstIndex(of: "-p")! + 1] == size.rawValue)
+            XCTAssertEqual(args[args.firstIndex(of: "-p")! + 1], size.rawValue)
         }
         let custom = try PrinttargArgs.build(config: config(
             pageSize: .custom, customW: 150, customH: 220))
-        #expect(custom[custom.firstIndex(of: "-p")! + 1] == "150x220")
+        XCTAssertEqual(custom[custom.firstIndex(of: "-p")! + 1], "150x220")
     }
 
-    @Test("Custom page below 50 mm throws")
-    func customPageTooSmall() {
-        #expect(throws: PrinttargArgError.self) {
-            try PrinttargArgs.build(config: config(pageSize: .custom, customW: 49.9))
+    func testCustomPageTooSmall() {
+        XCTAssertThrowsError(try PrinttargArgs.build(config: config(pageSize: .custom, customW: 49.9))) { error in
+            XCTAssertTrue(error is PrinttargArgError)
         }
-        #expect(throws: PrinttargArgError.self) {
-            try PrinttargArgs.build(config: config(pageSize: .custom, customH: 10))
+        XCTAssertThrowsError(try PrinttargArgs.build(config: config(pageSize: .custom, customH: 10))) { error in
+            XCTAssertTrue(error is PrinttargArgError)
         }
     }
 
-    @Test("Calibration: -K applies, -I embeds")
-    func calibrationFlags() throws {
+    func testCalibrationFlags() throws {
         let k = try PrinttargArgs.build(config: config(calFile: "/tmp/a.cal"))
-        #expect(k[k.firstIndex(of: "-K")! + 1] == "/tmp/a.cal")
+        XCTAssertEqual(k[k.firstIndex(of: "-K")! + 1], "/tmp/a.cal")
         let i = try PrinttargArgs.build(config: config(calFile: "/tmp/a.cal", calEmbed: true))
-        #expect(i[i.firstIndex(of: "-I")! + 1] == "/tmp/a.cal")
-        #expect(!i.contains("-K"))
+        XCTAssertEqual(i[i.firstIndex(of: "-I")! + 1], "/tmp/a.cal")
+        XCTAssertFalse(i.contains("-K"))
     }
 
-    @Test("CAL_ basename never gets -K or -I")
-    func calProtection() throws {
+    func testCalProtection() throws {
         let args = try PrinttargArgs.build(
             config: config(calFile: "/tmp/a.cal", basename: "CAL_test"))
-        #expect(!args.contains("-K"))
-        #expect(!args.contains("-I"))
+        XCTAssertFalse(args.contains("-K"))
+        XCTAssertFalse(args.contains("-I"))
     }
 
-    @Test("Whitespace-only label emits no -d; whitespace-only calibration emits no -K/-I")
-    func whitespaceOptions() throws {
+    func testWhitespaceOptions() throws {
         let args = try PrinttargArgs.build(
             config: config(label: "   \n ", calFile: " \t "))
-        #expect(!args.contains("-d"))
-        #expect(!args.contains("-K"))
-        #expect(!args.contains("-I"))
+        XCTAssertFalse(args.contains("-d"))
+        XCTAssertFalse(args.contains("-K"))
+        XCTAssertFalse(args.contains("-I"))
     }
 
-    @Test("Label and calibration values are trimmed before emission")
-    func trimmedOptions() throws {
+    func testTrimmedOptions() throws {
         let args = try PrinttargArgs.build(
             config: config(label: "  My Label  ", calFile: "  /tmp/a.cal  "))
-        #expect(args[args.firstIndex(of: "-d")! + 1] == "My Label")
-        #expect(args[args.firstIndex(of: "-K")! + 1] == "/tmp/a.cal")
+        XCTAssertEqual(args[args.firstIndex(of: "-d")! + 1], "My Label")
+        XCTAssertEqual(args[args.firstIndex(of: "-K")! + 1], "/tmp/a.cal")
     }
 
-    @Test("Unsafe basename throws")
-    func unsafeBasename() {
-        #expect(throws: PathSecurity.Error.self) {
-            try PrinttargArgs.build(config: config(basename: "../x"))
+    func testUnsafeBasename() {
+        XCTAssertThrowsError(try PrinttargArgs.build(config: config(basename: "../x"))) { error in
+            XCTAssertTrue(error is PathSecurity.Error)
         }
     }
 }
 
-@Suite("PrinttargLabel")
-struct PrinttargLabelTests {
+final class PrinttargLabelTests: XCTestCase {
 
     private var fixedDate: Date {
         var comps = DateComponents()
@@ -166,37 +150,33 @@ struct PrinttargLabelTests {
         return Calendar(identifier: .gregorian).date(from: comps)!
     }
 
-    @Test("Automatic label: ICCery - basename - P - I - DP - AP - DD/MM/YYYY HH:MM")
-    func automatic() {
+    func testAutomatic() {
         let label = PrinttargLabel.automatic(
             basename: "tgt",
             metadata: TargetLabelMetadata(
                 printer: "Epson", inkSet: "CMYK",
                 driverPaper: "Photo", actualPaper: "Matte"),
             date: fixedDate, timeZone: .current)
-        #expect(label.hasPrefix("ICCery - tgt - Epson - CMYK - Photo - Matte - "))
-        #expect(label.hasSuffix("03/02/2026") || label.contains("/02/2026"))
+        XCTAssertTrue(label.hasPrefix("ICCery - tgt - Epson - CMYK - Photo - Matte - "))
+        XCTAssertTrue(label.hasSuffix("03/02/2026") || label.contains("/02/2026"))
     }
 
-    @Test("Missing metadata becomes Unspecified")
-    func unspecified() {
+    func testUnspecified() {
         let label = PrinttargLabel.automatic(
             basename: "tgt", metadata: TargetLabelMetadata(),
             date: fixedDate, timeZone: .current)
-        #expect(label.contains(" - Unspecified - Unspecified - Unspecified - Unspecified - "))
+        XCTAssertTrue(label.contains(" - Unspecified - Unspecified - Unspecified - Unspecified - "))
     }
 
-    @Test("Manual label wins over automatic")
-    func manualWins() {
+    func testManualWins() {
         let resolved = PrinttargLabel.resolved(
             customLabel: "  My Label  ", basename: "tgt",
             metadata: TargetLabelMetadata(), date: fixedDate)
-        #expect(resolved == "My Label")
+        XCTAssertEqual(resolved, "My Label")
     }
 }
 
-@Suite("PrinttargManifest")
-struct PrinttargManifestTests {
+final class PrinttargManifestTests: XCTestCase {
 
     private let prettySingle = """
         Some log line
@@ -225,66 +205,58 @@ struct PrinttargManifestTests {
         }
         """
 
-    @Test("Decodes a single-page pretty manifest amid log noise")
-    func singlePage() throws {
+    func testSinglePage() throws {
         let m = try PrinttargManifestExtractor.manifest(from: prettySingle)
-        #expect(m.event == "manifest")
-        #expect(m.pages.count == 1)
-        #expect(m.pages[0].filename == "target.tif")
-        #expect(m.pages[0].patches == 800)
+        XCTAssertEqual(m.event, "manifest")
+        XCTAssertEqual(m.pages.count, 1)
+        XCTAssertEqual(m.pages[0].filename, "target.tif")
+        XCTAssertEqual(m.pages[0].patches, 800)
     }
 
-    @Test("Multi-page manifest preserves order")
-    func multiPage() throws {
+    func testMultiPage() throws {
         let m = try PrinttargManifestExtractor.manifest(from: prettyMulti)
-        #expect(m.pages.map(\.filename) == ["p1.tif", "p2.tif"])
+        XCTAssertEqual(m.pages.map(\.filename), ["p1.tif", "p2.tif"])
     }
 
-    @Test("No JSON document → noJSONDocument")
-    func noJSON() {
-        #expect(throws: ManifestError.self) {
-            try PrinttargManifestExtractor.manifest(from: "plain text\nno json")
+    func testNoJSON() {
+        XCTAssertThrowsError(try PrinttargManifestExtractor.manifest(from: "plain text\nno json")) { error in
+            XCTAssertTrue(error is ManifestError)
         }
     }
 
-    @Test("Wrong event → wrongEvent")
-    func wrongEvent() {
+    func testWrongEvent() {
         let stdout = "{\n  \"event\": \"row\",\n  \"row\": 1\n}\n"
-        #expect(throws: ManifestError.self) {
-            try PrinttargManifestExtractor.manifest(from: stdout)
+        XCTAssertThrowsError(try PrinttargManifestExtractor.manifest(from: stdout)) { error in
+            XCTAssertTrue(error is ManifestError)
         }
     }
 
-    @Test("ROW_COLORS_JSON line is never treated as the manifest")
-    func rowColorsNotManifest() {
+    func testRowColorsNotManifest() {
         let stdout = "ROW_COLORS_JSON: {\"a\":1}\n{\"event\":\"manifest\",\"pages\":[]}"
         // Extraction only starts at a '{' that begins a trimmed line,
         // so the ROW_COLORS_JSON line is skipped entirely.
         let m = try? PrinttargManifestExtractor.manifest(from: stdout)
-        #expect(m != nil)
-        #expect(m?.event == "manifest")
+        XCTAssertNotNil(m)
+        XCTAssertEqual(m?.event, "manifest")
     }
 
-    @Test("Braces inside a quoted filename do not corrupt the scan")
-    func bracesInFilename() throws {
+    func testBracesInFilename() throws {
         let stdout = "log\n{\n\"event\": \"manifest\",\n\"pages\": [{\"filename\": \"a}b.tif\", \"patches\": 1, \"width_mm\": 50, \"height_mm\": 50}]\n}\n"
         let m = try PrinttargManifestExtractor.manifest(from: stdout)
-        #expect(m.pages[0].filename == "a}b.tif")
+        XCTAssertEqual(m.pages[0].filename, "a}b.tif")
     }
 
-    @Test("Unsafe / non-TIFF filenames rejected")
-    func unsafeFilenames() {
+    func testUnsafeFilenames() {
         for bad in ["../x.tif", "/abs/x.tif", "dir/x.tif", "x.txt", ""] {
             let stdout = "{\n\"event\":\"manifest\",\"pages\":[{\"filename\":\"\(bad)\",\"patches\":1,\"width_mm\":50,\"height_mm\":50}]\n}"
-            #expect(throws: ManifestError.self) {
-                try PrinttargManifestExtractor.manifest(from: stdout)
+            XCTAssertThrowsError(try PrinttargManifestExtractor.manifest(from: stdout)) { error in
+                XCTAssertTrue(error is ManifestError)
             }
         }
     }
 }
 
-@Suite("ArgyllRunner Printtarg")
-struct ArgyllRunnerPrinttargTests {
+final class ArgyllRunnerPrinttargTests: XCTestCase {
 
     private func makeFixture(_ body: String, name: String = "printtarg") throws -> URL {
         let dir = FileManager.default.temporaryDirectory
@@ -336,8 +308,7 @@ struct ArgyllRunnerPrinttargTests {
         try Data(bytes).write(to: url)
     }
 
-    @Test("Successful printtarg emits .ti2 + manifest + PNG previews")
-    func success() async throws {
+    func testSuccess() async throws {
         let dir = try makeFixture("""
             #!/bin/sh
             last=""
@@ -356,18 +327,17 @@ struct ArgyllRunnerPrinttargTests {
             processManager: ProcessManager(), binaryResolver: resolver)
         let config = PrinttargConfig(basename: "pt", workingDirectory: dir)
         let result = try await runner.runPrinttarg(config: config)
-        #expect(result.ti2URL.lastPathComponent == "pt.ti2")
-        #expect(result.manifest.pages.count == 1)
-        #expect(result.pages.count == 1)
+        XCTAssertEqual(result.ti2URL.lastPathComponent, "pt.ti2")
+        XCTAssertEqual(result.manifest.pages.count, 1)
+        XCTAssertEqual(result.pages.count, 1)
         let png = result.pages[0].previewPNG
-        #expect(png != nil)
+        XCTAssertNotNil(png)
         if let png {
-            #expect(png.prefix(8) == Data([0x89,0x50,0x4E,0x47,0x0D,0x0A,0x1A,0x0A]))
+            XCTAssertEqual(png.prefix(8), Data([0x89,0x50,0x4E,0x47,0x0D,0x0A,0x1A,0x0A]))
         }
     }
 
-    @Test("Non-zero exit throws toolFailed and stays on stage")
-    func failure() async throws {
+    func testFailure() async throws {
         let dir = try makeFixture("""
             #!/bin/sh
             echo "oops" >&2
@@ -377,15 +347,16 @@ struct ArgyllRunnerPrinttargTests {
         let runner = ArgyllRunner(
             processManager: ProcessManager(),
             binaryResolver: BinaryResolver(bundledRoot: dir, overrideDir: dir))
-        await #expect(throws: ArgyllRunnerError.toolFailed(
-            tool: "printtarg", code: 3, logs: ["oops"])) {
+        await assertAsyncThrows(expectedType: ArgyllRunnerError.self) {
             try await runner.runPrinttarg(
                 config: PrinttargConfig(basename: "x", workingDirectory: dir))
+        } errorHandler: { error in
+            XCTAssertEqual(error, .toolFailed(
+                tool: "printtarg", code: 3, logs: ["oops"]))
         }
     }
 
-    @Test("Exit 0 without manifest → malformedManifest")
-    func noManifest() async throws {
+    func testNoManifest() async throws {
         let dir = try makeFixture("""
             #!/bin/sh
             last=""
@@ -398,14 +369,13 @@ struct ArgyllRunnerPrinttargTests {
         let runner = ArgyllRunner(
             processManager: ProcessManager(),
             binaryResolver: BinaryResolver(bundledRoot: dir, overrideDir: dir))
-        await #expect(throws: ArgyllRunnerError.self) {
+        await assertAsyncThrows(expectedType: ArgyllRunnerError.self) {
             try await runner.runPrinttarg(
                 config: PrinttargConfig(basename: "x", workingDirectory: dir))
         }
     }
 
-    @Test("Exit 0 without .ti2 → missingArtefact")
-    func noTi2() async throws {
+    func testNoTi2() async throws {
         let dir = try makeFixture("""
             #!/bin/sh
             printf '{\\n"event":"manifest",\\n"pages":[]\\n}\\n'
@@ -415,14 +385,13 @@ struct ArgyllRunnerPrinttargTests {
         let runner = ArgyllRunner(
             processManager: ProcessManager(),
             binaryResolver: BinaryResolver(bundledRoot: dir, overrideDir: dir))
-        await #expect(throws: ArgyllRunnerError.self) {
+        await assertAsyncThrows(expectedType: ArgyllRunnerError.self) {
             try await runner.runPrinttarg(
                 config: PrinttargConfig(basename: "x", workingDirectory: dir))
         }
     }
 
-    @Test("Deterministic config produces byte-identical .ti2")
-    func determinism() async throws {
+    func testDeterminism() async throws {
         let dir = try makeFixture("""
             #!/bin/sh
             last=""
@@ -442,6 +411,6 @@ struct ArgyllRunnerPrinttargTests {
             config: PrinttargConfig(basename: "b", workingDirectory: dir))
         let d1 = try Data(contentsOf: dir.appendingPathComponent("a.ti2"))
         let d2 = try Data(contentsOf: dir.appendingPathComponent("b.ti2"))
-        #expect(d1 == d2)
+        XCTAssertEqual(d1, d2)
     }
 }

Tests/ICCeryCoreTests/ProcessManagerTests.swift

@@ -1,11 +1,11 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 
 /// Helpers shared across ProcessManager tests. Fixture binaries are shell
 /// scripts written to a temp dir — no resource bundling required.
-@Suite("ProcessManager", .serialized)
-struct ProcessManagerTests {
+/// XCTest executes test methods serially by default.
+final class ProcessManagerTests: XCTestCase {
 
     // MARK: - Fixture plumbing
 
@@ -43,7 +43,7 @@ struct ProcessManagerTests {
                 if box.finish() { cont.resume(returning: box.events) }
             }
             Task {
-                try? await Task.sleep(for: .seconds(timeout))
+                try? await Task.sleep(nanoseconds: UInt64(timeout * 1_000_000_000))
                 if box.finish() { cont.resume(returning: box.events) }
             }
         }
@@ -84,7 +84,7 @@ struct ProcessManagerTests {
         let deadline = Date().addingTimeInterval(timeout)
         while Date() < deadline {
             if exitCount(in: box) > 0 { return true }
-            try? await Task.sleep(for: .milliseconds(10))
+            try? await Task.sleep(nanoseconds: 10_000_000)
         }
         return false
     }
@@ -93,7 +93,7 @@ struct ProcessManagerTests {
         let deadline = Date().addingTimeInterval(timeout)
         while Date() < deadline {
             if FileManager.default.fileExists(atPath: url.path) { return true }
-            try? await Task.sleep(for: .milliseconds(10))
+            try? await Task.sleep(nanoseconds: 10_000_000)
         }
         return false
     }
@@ -106,14 +106,14 @@ struct ProcessManagerTests {
         let deadline = Date().addingTimeInterval(timeout)
         while Date() < deadline {
             if await manager.isRunning(id) { return true }
-            try? await Task.sleep(for: .milliseconds(10))
+            try? await Task.sleep(nanoseconds: 10_000_000)
         }
         return false
     }
 
     // MARK: - Tests
 
-    @Test func streamsStdoutAndEmitsExit() async throws {
+    func testStreamsStdoutAndEmitsExit() async throws {
         let pm = ProcessManager()
         let bin = try script("lines.sh", "#!/bin/sh\necho hello\necho world\n")
         async let events = collect(pm, id: "t1")
@@ -122,21 +122,21 @@ struct ProcessManagerTests {
         let lines = evs.compactMap { e -> String? in
             if case .stdout(_, let l) = e { return l }; return nil
         }
-        #expect(lines == ["hello", "world"])
-        #expect(evs.contains(.exit(id: "t1", code: 0)))
+        XCTAssertEqual(lines, ["hello", "world"])
+        XCTAssertTrue(evs.contains(.exit(id: "t1", code: 0)))
     }
 
-    @Test func routesStderrSeparately() async throws {
+    func testRoutesStderrSeparately() async throws {
         let pm = ProcessManager()
         let bin = try script("err.sh", "#!/bin/sh\necho out\necho oops 1>&2\n")
         async let evs = collect(pm, id: "t2")
         try await pm.runStreaming(id: "t2", binary: bin, arguments: [])
         let events = await evs
-        #expect(events.contains(.stdout(id: "t2", line: "out")))
-        #expect(events.contains(.stderr(id: "t2", line: "oops")))
+        XCTAssertTrue(events.contains(.stdout(id: "t2", line: "out")))
+        XCTAssertTrue(events.contains(.stderr(id: "t2", line: "oops")))
     }
 
-    @Test func stripsRowColorsJSONPrefix() async throws {
+    func testStripsRowColorsJSONPrefix() async throws {
         let pm = ProcessManager()
         let bin = try script(
             "rows.sh",
@@ -149,21 +149,22 @@ struct ProcessManagerTests {
             if case .jsonRow(_, let d) = e { return String(decoding: d, as: UTF8.self) }
             return nil
         }
-        #expect(rows == ["{\"row\":1}"])
-        #expect(events.contains(.stdout(id: "t3", line: "plain")))
+        XCTAssertEqual(rows, ["{\"row\":1}"])
+        XCTAssertTrue(events.contains(.stdout(id: "t3", line: "plain")))
         // Prefixed lines must not leak into stdout.
-        #expect(!events.contains(.stdout(id: "t3", line: "ROW_COLORS_JSON: {\"row\":1}")))
+        XCTAssertFalse(events.contains(.stdout(id: "t3", line: "ROW_COLORS_JSON: {\"row\":1}")))
     }
 
-    @Test func unterminatedTailFlushesOnExit() async throws {
+    func testUnterminatedTailFlushesOnExit() async throws {
         let pm = ProcessManager()
         let bin = try script("tail.sh", "#!/bin/sh\nprintf 'no-newline'\n")
         async let evs = collect(pm, id: "t4")
         try await pm.runStreaming(id: "t4", binary: bin, arguments: [])
-        #expect(await evs.contains(.stdout(id: "t4", line: "no-newline")))
+        let t4SawTail = await evs.contains(.stdout(id: "t4", line: "no-newline"))
+        XCTAssertTrue(t4SawTail)
     }
 
-    @Test func stdinRoundTrip() async throws {
+    func testStdinRoundTrip() async throws {
         let pm = ProcessManager()
         // Read two lines then exit naturally — a killed sh would lose its
         // buffered stdio output, which is exactly the chartread pattern.
@@ -176,21 +177,23 @@ struct ProcessManagerTests {
         try await pm.sendStdin(id: "t5", text: " \n")
         try await pm.sendStdin(id: "t5", text: "d\n")
         let events = await evs
-        #expect(events.contains(.stdout(id: "t5", line: "got: ")))
-        #expect(events.contains(.stdout(id: "t5", line: "got:d")))
+        XCTAssertTrue(events.contains(.stdout(id: "t5", line: "got: ")))
+        XCTAssertTrue(events.contains(.stdout(id: "t5", line: "got:d")))
     }
 
-    @Test func duplicateIDRejected() async throws {
+    func testDuplicateIDRejected() async throws {
         let pm = ProcessManager()
         let bin = try script("slow.sh", "#!/bin/sh\nsleep 30\n")
         try await pm.runStreaming(id: "t6", binary: bin, arguments: [])
-        await #expect(throws: ProcessError.duplicateID("t6")) {
+        await assertAsyncThrows(expectedType: ProcessError.self) {
             try await pm.runStreaming(id: "t6", binary: bin, arguments: [])
+        } errorHandler: { error in
+            XCTAssertEqual(error, .duplicateID("t6"))
         }
         await pm.kill(id: "t6")
     }
 
-    @Test func killEmitsExitAndClosesStdin() async throws {
+    func testKillEmitsExitAndClosesStdin() async throws {
         let pm = ProcessManager()
         let bin = try script("slow2.sh", "#!/bin/sh\ncat\n")
         async let evs = collect(pm, id: "t7")
@@ -199,49 +202,51 @@ struct ProcessManagerTests {
         let events = await evs
         // exit emitted exactly once
         let exits = events.filter { if case .exit = $0 { return true }; return false }
-        #expect(exits.count == 1)
-        await #expect(throws: ProcessError.unknownID("t7")) {
+        XCTAssertEqual(exits.count, 1)
+        await assertAsyncThrows(expectedType: ProcessError.self) {
             try await pm.sendStdin(id: "t7", text: "d\n")
+        } errorHandler: { error in
+            XCTAssertEqual(error, .unknownID("t7"))
         }
     }
 
-    @Test func killAllCountsSignaled() async throws {
+    func testKillAllCountsSignaled() async throws {
         let pm = ProcessManager()
         let bin = try script("slow3.sh", "#!/bin/sh\nsleep 30\n")
         try await pm.runStreaming(id: "a", binary: bin, arguments: [])
         try await pm.runStreaming(id: "b", binary: bin, arguments: [])
         let count = await pm.killAll()
-        #expect(count == 2)
+        XCTAssertEqual(count, 2)
     }
 
-    @Test func capturedRunReturnsBothStreams() async throws {
+    func testCapturedRunReturnsBothStreams() async throws {
         let pm = ProcessManager()
         let bin = try script("cap.sh", "#!/bin/sh\necho out-data\necho err-data 1>&2\nexit 3\n")
         let result = try await pm.runCaptured(id: "cap", binary: bin, arguments: [])
-        #expect(result.stdout.contains("out-data"))
-        #expect(result.stderr.contains("err-data"))
-        #expect(result.exitCode == 3)
+        XCTAssertTrue(result.stdout.contains("out-data"))
+        XCTAssertTrue(result.stderr.contains("err-data"))
+        XCTAssertEqual(result.exitCode, 3)
     }
 
-    @Test func capturedRunFastExit() async throws {
+    func testCapturedRunFastExit() async throws {
         let pm = ProcessManager()
         let bin = try script("fast.sh", "#!/bin/sh\nexit 7\n")
         let result = try await pm.runCaptured(id: "fast", binary: bin, arguments: [])
-        #expect(result.exitCode == 7)
-        #expect(result.stdout == "")
-        #expect(result.stderr == "")
+        XCTAssertEqual(result.exitCode, 7)
+        XCTAssertEqual(result.stdout, "")
+        XCTAssertEqual(result.stderr, "")
     }
 
-    @Test func capturedRunStderrOnly() async throws {
+    func testCapturedRunStderrOnly() async throws {
         let pm = ProcessManager()
         let bin = try script("stderr-only.sh", "#!/bin/sh\necho 'mock lp failure' 1>&2\nexit 1\n")
         let result = try await pm.runCaptured(id: "stderr-only", binary: bin, arguments: [])
-        #expect(result.exitCode == 1)
-        #expect(result.stdout == "")
-        #expect(result.stderr.contains("mock lp failure"))
+        XCTAssertEqual(result.exitCode, 1)
+        XCTAssertEqual(result.stdout, "")
+        XCTAssertTrue(result.stderr.contains("mock lp failure"))
     }
 
-    @Test func capturedRunDoesNotDeadlockOnLargeOutput() async throws {
+    func testCapturedRunDoesNotDeadlockOnLargeOutput() async throws {
         let pm = ProcessManager()
         // 5000 lines each stream exceeds the 64 KiB pipe buffer.
         let bin = try script(
@@ -249,26 +254,29 @@ struct ProcessManagerTests {
             "#!/bin/sh\ni=0; while [ $i -lt 5000 ]; do echo \"out-$i\"; echo \"err-$i\" 1>&2; i=$((i+1)); done\n"
         )
         let result = try await pm.runCaptured(id: "big", binary: bin, arguments: [])
-        #expect(result.stdout.contains("out-4999"))
-        #expect(result.stderr.contains("err-4999"))
+        XCTAssertTrue(result.stdout.contains("out-4999"))
+        XCTAssertTrue(result.stderr.contains("err-4999"))
     }
 
-    @Test func argyllEnvVarIsSet() async throws {
+    func testArgyllEnvVarIsSet() async throws {
         let pm = ProcessManager()
         let bin = try script("env.sh", "#!/bin/sh\necho \"ANI=$ARGYLL_NOT_INTERACTIVE\"\n")
         async let evs = collect(pm, id: "t10")
         try await pm.runStreaming(id: "t10", binary: bin, arguments: [])
-        #expect(await evs.contains(.stdout(id: "t10", line: "ANI=1")))
+        let t10SawEnv = await evs.contains(.stdout(id: "t10", line: "ANI=1"))
+        XCTAssertTrue(t10SawEnv)
     }
 
-    @Test func unknownIDStdinThrows() async throws {
+    func testUnknownIDStdinThrows() async throws {
         let pm = ProcessManager()
-        await #expect(throws: ProcessError.unknownID("nope")) {
+        await assertAsyncThrows(expectedType: ProcessError.self) {
             try await pm.sendStdin(id: "nope", text: "d\n")
+        } errorHandler: { error in
+            XCTAssertEqual(error, .unknownID("nope"))
         }
     }
 
-    @Test func explicitPartialFlushEmitsRowColorsJSON() async throws {
+    func testExplicitPartialFlushEmitsRowColorsJSON() async throws {
         let pm = ProcessManager()
         let marker = Self.fixtureDir
             .appendingPathComponent("partial-row-ready-\(UUID().uuidString)")
@@ -279,7 +287,8 @@ struct ProcessManagerTests {
         let box = Box()
         let observer = observe(pm, id: "t11", into: box)
         try await pm.runStreaming(id: "t11", binary: bin, arguments: [marker.path])
-        #expect(await waitForFile(marker))
+        let markerReady = await waitForFile(marker)
+        XCTAssertTrue(markerReady)
         // Retry the flush so the pipe-ingest task can win the actor race
         // on a loaded host; the first successful flush emits the row.
         var flushed = false
@@ -289,24 +298,25 @@ struct ProcessManagerTests {
                 flushed = true
                 break
             }
-            try await Task.sleep(for: .milliseconds(20))
+            try await Task.sleep(nanoseconds: 20_000_000)
         }
-        #expect(flushed)
+        XCTAssertTrue(flushed)
         await pm.kill(id: "t11")
-        #expect(await waitForExit(in: box))
+        let sawExit = await waitForExit(in: box)
+        XCTAssertTrue(sawExit)
         observer.cancel()
         let events = box.events
         let rows = events.compactMap { e -> String? in
             if case .jsonRow(_, let d) = e { return String(decoding: d, as: UTF8.self) }
             return nil
         }
-        #expect(rows == ["{\"row\":9}"])
+        XCTAssertEqual(rows, ["{\"row\":9}"])
         // Prefixed tails must not leak into stdout, even via finalize.
-        #expect(!events.contains(.stdout(id: "t11", line: "ROW_COLORS_JSON: {\"row\":9}")))
-        #expect(exitCount(in: box) == 1)
+        XCTAssertFalse(events.contains(.stdout(id: "t11", line: "ROW_COLORS_JSON: {\"row\":9}")))
+        XCTAssertEqual(exitCount(in: box), 1)
     }
 
-    @Test func unterminatedRowTailFinalizesAsJSONRow() async throws {
+    func testUnterminatedRowTailFinalizesAsJSONRow() async throws {
         let pm = ProcessManager()
         let bin = try script(
             "row-tail.sh",
@@ -315,68 +325,70 @@ struct ProcessManagerTests {
         let box = Box()
         let observer = observe(pm, id: "t12", into: box)
         try await pm.runStreaming(id: "t12", binary: bin, arguments: [])
-        #expect(await waitForExit(in: box))
+        let sawExit = await waitForExit(in: box)
+        XCTAssertTrue(sawExit)
         observer.cancel()
         let events = box.events
         let rows = events.compactMap { e -> String? in
             if case .jsonRow(_, let d) = e { return String(decoding: d, as: UTF8.self) }
             return nil
         }
-        #expect(rows == ["{\"row\":42}"])
-        #expect(!events.contains(.stdout(id: "t12", line: "ROW_COLORS_JSON: {\"row\":42}")))
+        XCTAssertEqual(rows, ["{\"row\":42}"])
+        XCTAssertFalse(events.contains(.stdout(id: "t12", line: "ROW_COLORS_JSON: {\"row\":42}")))
         let rowIndex = events.firstIndex {
             if case .jsonRow = $0 { return true }; return false
         }
         let exitIndexes = events.indices.filter {
             if case .exit = events[$0] { return true }; return false
         }
-        #expect(exitIndexes.count == 1)
+        XCTAssertEqual(exitIndexes.count, 1)
         if let rowIndex, let exitIndex = exitIndexes.first {
-            #expect(rowIndex < exitIndex)
+            XCTAssertTrue(rowIndex < exitIndex)
         } else {
-            Issue.record("expected a jsonRow before the exit event")
+            XCTFail("expected a jsonRow before the exit event")
         }
     }
 
-    @Test func fastStreamingExitEmitsExactlyOneExit() async throws {
+    func testFastStreamingExitEmitsExactlyOneExit() async throws {
         let pm = ProcessManager()
         let bin = try script("fast-stream.sh", "#!/bin/sh\nexit 0\n")
         let box = Box()
         let observer = observe(pm, id: "t13", into: box)
         try await pm.runStreaming(id: "t13", binary: bin, arguments: [])
-        #expect(await waitForExit(in: box))
+        let sawExit = await waitForExit(in: box)
+        XCTAssertTrue(sawExit)
         // The grace window must outlast the 2 s finalize watchdog so a
         // duplicate emission from it would be observed.
-        try await Task.sleep(for: .milliseconds(2500))
+        try await Task.sleep(nanoseconds: 2_500_000_000)
         observer.cancel()
-        #expect(box.events == [.exit(id: "t13", code: 0)])
+        XCTAssertEqual(box.events, [.exit(id: "t13", code: 0)])
     }
 
-    @Test func fastCapturedExitEmitsExactlyOneExit() async throws {
+    func testFastCapturedExitEmitsExactlyOneExit() async throws {
         let pm = ProcessManager()
         let bin = try script("fast-cap.sh", "#!/bin/sh\nexit 7\n")
         let box = Box()
         let observer = observe(pm, id: "t14", into: box)
         let result = try await pm.runCaptured(id: "t14", binary: bin, arguments: [])
-        #expect(result.exitCode == 7)
+        XCTAssertEqual(result.exitCode, 7)
         // Both the termination handler and the waitUntilExit watchdog
         // resume the same box; give the slower path time to fire.
-        try await Task.sleep(for: .milliseconds(500))
+        try await Task.sleep(nanoseconds: 500_000_000)
         observer.cancel()
-        #expect(box.events == [.exit(id: "t14", code: 7)])
+        XCTAssertEqual(box.events, [.exit(id: "t14", code: 7)])
     }
 
-    @Test func capturedRunSetsArgyllNotInteractive() async throws {
+    func testCapturedRunSetsArgyllNotInteractive() async throws {
         let pm = ProcessManager()
         let bin = try script(
             "cap-env.sh",
             "#!/bin/sh\necho \"ANI=$ARGYLL_NOT_INTERACTIVE\"\n"
         )
         let result = try await pm.runCaptured(id: "t15", binary: bin, arguments: [])
-        #expect(result.stdout == "ANI=1\n")
+        XCTAssertEqual(result.stdout, "ANI=1\n")
     }
 
-    @Test func killAllTerminatesStreamingAndCapturedChildren() async throws {
+    func testKillAllTerminatesStreamingAndCapturedChildren() async throws {
         let pm = ProcessManager()
         let marker = Self.fixtureDir
             .appendingPathComponent("mixed-cap-ready-\(UUID().uuidString)")
@@ -390,83 +402,88 @@ struct ProcessManagerTests {
         let capTask = Task {
             try await pm.runCaptured(id: "t17", binary: capBin, arguments: [marker.path])
         }
-        #expect(await waitForFile(marker))
-        #expect(await waitForRunning(pm, id: "t16"))
-        #expect(await waitForRunning(pm, id: "t17"))
-        #expect(await pm.killAll() == 2)
+        let markerReady = await waitForFile(marker)
+        XCTAssertTrue(markerReady)
+        let t16Running = await waitForRunning(pm, id: "t16")
+        XCTAssertTrue(t16Running)
+        let t17Running = await waitForRunning(pm, id: "t17")
+        XCTAssertTrue(t17Running)
+        let killed = await pm.killAll()
+        XCTAssertEqual(killed, 2)
         _ = try await capTask.value
-        #expect(await waitForExit(in: streamBox))
-        #expect(await waitForExit(in: capBox))
+        let streamExit = await waitForExit(in: streamBox)
+        XCTAssertTrue(streamExit)
+        let capExit = await waitForExit(in: capBox)
+        XCTAssertTrue(capExit)
         // Grace window outlasts the streaming finalize watchdog.
-        try await Task.sleep(for: .milliseconds(2500))
+        try await Task.sleep(nanoseconds: 2_500_000_000)
         streamObserver.cancel()
         capObserver.cancel()
-        #expect(!(await pm.isRunning("t16")))
-        #expect(!(await pm.isRunning("t17")))
-        #expect(exitCount(in: streamBox) == 1)
-        #expect(exitCount(in: capBox) == 1)
+        let t16RunningAfter = await pm.isRunning("t16")
+        XCTAssertFalse(t16RunningAfter)
+        let t17RunningAfter = await pm.isRunning("t17")
+        XCTAssertFalse(t17RunningAfter)
+        XCTAssertEqual(exitCount(in: streamBox), 1)
+        XCTAssertEqual(exitCount(in: capBox), 1)
     }
 }
 
-@Suite("ProcessLineDecoder")
-struct ProcessLineDecoderTests {
-    @Test func splitsAcrossChunkBoundaries() {
+final class ProcessLineDecoderTests: XCTestCase {
+    func testSplitsAcrossChunkBoundaries() {
         var d = ProcessLineDecoder()
-        #expect(d.feed(Data("he".utf8)) == [])
-        #expect(d.feed(Data("llo\nwor".utf8)) == ["hello"])
-        #expect(d.feed(Data("ld\n".utf8)) == ["world"])
-        #expect(d.finish() == nil)
+        XCTAssertEqual(d.feed(Data("he".utf8)), [])
+        XCTAssertEqual(d.feed(Data("llo\nwor".utf8)), ["hello"])
+        XCTAssertEqual(d.feed(Data("ld\n".utf8)), ["world"])
+        XCTAssertNil(d.finish())
     }
 
-    @Test func crlfIsStripped() {
+    func testCrlfIsStripped() {
         var d = ProcessLineDecoder()
-        #expect(d.feed(Data("a\r\nb\r\n".utf8)) == ["a", "b"])
+        XCTAssertEqual(d.feed(Data("a\r\nb\r\n".utf8)), ["a", "b"])
     }
 
-    @Test func finishReturnsRemainder() {
+    func testFinishReturnsRemainder() {
         var d = ProcessLineDecoder()
         _ = d.feed(Data("x".utf8))
-        #expect(d.finish() == "x")
-        #expect(d.finish() == nil)
+        XCTAssertEqual(d.finish(), "x")
+        XCTAssertNil(d.finish())
     }
 }
 
-@Suite("JSONAccumulator")
-struct JSONAccumulatorTests {
-    @Test func multilinePrettyJSON() {
+final class JSONAccumulatorTests: XCTestCase {
+    func testMultilinePrettyJSON() {
         var acc = JSONAccumulator()
-        #expect(acc.feed(line: "{") == nil)
-        #expect(acc.feed(line: "  \"k\": 1") == nil)
+        XCTAssertNil(acc.feed(line: "{"))
+        XCTAssertNil(acc.feed(line: "  \"k\": 1"))
         let done = acc.feed(line: "}")
-        #expect(done != nil)
+        XCTAssertNotNil(done)
         let obj = try? JSONSerialization.jsonObject(with: done!) as? [String: Int]
-        #expect(obj?["k"] == 1)
+        XCTAssertEqual(obj?["k"], 1)
     }
 
-    @Test func nonJSONLinesIgnored() {
+    func testNonJSONLinesIgnored() {
         var acc = JSONAccumulator()
-        #expect(acc.feed(line: "Reading instrument...") == nil)
-        #expect(acc.feed(line: "still text") == nil)
-        #expect(acc.completeData == nil)
+        XCTAssertNil(acc.feed(line: "Reading instrument..."))
+        XCTAssertNil(acc.feed(line: "still text"))
+        XCTAssertNil(acc.completeData)
     }
 
-    @Test func decodeTyped() {
+    func testDecodeTyped() {
         struct Doc: Decodable { let n: Int }
         var acc = JSONAccumulator()
         // Split so the doc completes on the second feed.
-        #expect(acc.feed(line: "{\"n\":") == nil)
+        XCTAssertNil(acc.feed(line: "{\"n\":"))
         let data = acc.feed(line: "7}")
-        #expect(data != nil)
+        XCTAssertNotNil(data)
         let doc = data.flatMap { try? JSONDecoder().decode(Doc.self, from: $0) }
-        #expect(doc?.n == 7)
-        #expect(acc.isEmpty)
+        XCTAssertEqual(doc?.n, 7)
+        XCTAssertTrue(acc.isEmpty)
     }
 }
 
-@Suite("LogSanitizer")
-struct LogSanitizerTests {
-    @Test func homeIsRewritten() {
+final class LogSanitizerTests: XCTestCase {
+    func testHomeIsRewritten() {
         let path = "\(NSHomeDirectory())/Documents/foo.ti1"
-        #expect(LogSanitizer.sanitize(path) == "~/Documents/foo.ti1")
+        XCTAssertEqual(LogSanitizer.sanitize(path), "~/Documents/foo.ti1")
     }
 }

Tests/ICCeryCoreTests/ProcessRunSupportTests.swift

@@ -1,5 +1,5 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCery
 
 /// Direct contracts for the shared logged-run helper (issue #80).
@@ -7,14 +7,12 @@ import Testing
 /// `runLogged` owns the running-flag transition (`false → true → false`)
 /// and the log-reset decision; these tests pin both sides of the
 /// contract plus the coalesced `@MainActor` log hop.
-@Suite("ProcessRunSupport runLogged")
 @MainActor
-struct ProcessRunSupportTests {
+final class ProcessRunSupportTests: XCTestCase {
 
     private struct SentinelError: Error {}
 
-    @Test("Success: running transitions [true, false], log resets once, batches reach the main actor, value preserved")
-    func successTransitions() async throws {
+    func testSuccessTransitions() async throws {
         var running: [Bool] = []
         var resets = 0
         var received: [String] = []
@@ -31,20 +29,19 @@ struct ProcessRunSupportTests {
             return 42
         }
 
-        #expect(result == 42)
-        #expect(running == [true, false])
-        #expect(resets == 1)
+        XCTAssertEqual(result, 42)
+        XCTAssertEqual(running, [true, false])
+        XCTAssertEqual(resets, 1)
 
         // The sink hops back through a main-actor Task; yield until the
         // coalesced batch lands.
         for _ in 0..<200 where received.isEmpty {
-            try await Task.sleep(for: .milliseconds(10))
+            try await Task.sleep(nanoseconds: 10_000_000)
         }
-        #expect(received == ["alpha", "beta"])
+        XCTAssertEqual(received, ["alpha", "beta"])
     }
 
-    @Test("Failure: running still transitions [true, false], log resets once, error is rethrown")
-    func failureTransitions() async throws {
+    func testFailureTransitions() async throws {
         var running: [Bool] = []
         var resets = 0
 
@@ -56,12 +53,12 @@ struct ProcessRunSupportTests {
             ) { _ -> Int in
                 throw SentinelError()
             }
-            Issue.record("Expected runLogged to rethrow")
+            XCTFail("Expected runLogged to rethrow")
         } catch is SentinelError {
             // Expected path.
         }
 
-        #expect(running == [true, false])
-        #expect(resets == 1)
+        XCTAssertEqual(running, [true, false])
+        XCTAssertEqual(resets, 1)
     }
 }

Tests/ICCeryCoreTests/ProfcheckArgsTests.swift

@@ -1,17 +1,15 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("ProfcheckArgs")
-struct ProfcheckArgsTests {
+final class ProfcheckArgsTests: XCTestCase {
 
-    @Test("Hard-coded argv")
-    func argv() throws {
+    func testArgv() throws {
         let config = ProfcheckConfig(
             ti3URL: URL(fileURLWithPath: "/tmp/target.ti3"),
             iccURL: URL(fileURLWithPath: "/tmp/target.icc")
         )
         let args = try ProfcheckArgs.build(config: config)
-        #expect(args == ["-v", "-k", "-s", "-u", "/tmp/target.ti3", "/tmp/target.icc"])
+        XCTAssertEqual(args, ["-v", "-k", "-s", "-u", "/tmp/target.ti3", "/tmp/target.icc"])
     }
 }

Tests/ICCeryCoreTests/ProfcheckParserTests.swift

@@ -1,43 +1,39 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("ProfcheckParser")
-struct ProfcheckParserTests {
+final class ProfcheckParserTests: XCTestCase {
 
-    @Test("Prefers JSON report with de2000 keys")
-    func jsonReport() {
+    func testJsonReport() {
         let output = """
         No of test patches = 52
         {"event": "report", "peak_de2000": 2.41, "avg_de2000": 0.85, "rms": 1.02}
         Profile check complete, errors(CIEDE2000): max. = 9.99, avg. = 9.99, RMS = 9.99
         """
         let report = ProfcheckParser.parse(output)
-        #expect(report.isValid == true)
-        #expect(report.patchCount == 52)
-        #expect(report.avgDE == 0.85)
-        #expect(report.maxDE == 2.41)
-        #expect(report.rmsDE == 1.02)
-        #expect(report.status == .excellent)
+        XCTAssertEqual(report.isValid, true)
+        XCTAssertEqual(report.patchCount, 52)
+        XCTAssertEqual(report.avgDE, 0.85)
+        XCTAssertEqual(report.maxDE, 2.41)
+        XCTAssertEqual(report.rmsDE, 1.02)
+        XCTAssertEqual(report.status, .excellent)
     }
 
-    @Test("Falls back to legacy text")
-    func legacyText() {
+    func testLegacyText() {
         let output = """
         No of test patches = 120
         Profile check complete, errors(CIEDE2000): max. = 3.50, avg. = 1.80, RMS = 0.95
         """
         let report = ProfcheckParser.parse(output)
-        #expect(report.isValid == true)
-        #expect(report.patchCount == 120)
-        #expect(report.avgDE == 1.80)
-        #expect(report.maxDE == 3.50)
-        #expect(report.rmsDE == 0.95)
-        #expect(report.status == .good)
+        XCTAssertEqual(report.isValid, true)
+        XCTAssertEqual(report.patchCount, 120)
+        XCTAssertEqual(report.avgDE, 1.80)
+        XCTAssertEqual(report.maxDE, 3.50)
+        XCTAssertEqual(report.rmsDE, 0.95)
+        XCTAssertEqual(report.status, .good)
     }
 
-    @Test("Broad regex fallback")
-    func regexFallback() {
+    func testRegexFallback() {
         let output = """
         No of test patches = 10
         avg = 4.25
@@ -45,27 +41,25 @@ struct ProfcheckParserTests {
         rms = 2.30
         """
         let report = ProfcheckParser.parse(output)
-        #expect(report.isValid == true)
-        #expect(report.avgDE == 4.25)
-        #expect(report.maxDE == 6.10)
-        #expect(report.rmsDE == 2.30)
-        #expect(report.status == .poor)
+        XCTAssertEqual(report.isValid, true)
+        XCTAssertEqual(report.avgDE, 4.25)
+        XCTAssertEqual(report.maxDE, 6.10)
+        XCTAssertEqual(report.rmsDE, 2.30)
+        XCTAssertEqual(report.status, .poor)
     }
 
-    @Test("Unparseable output warns, not zeros")
-    func unparseable() {
+    func testUnparseable() {
         let output = "some random text without metrics"
         let report = ProfcheckParser.parse(output)
-        #expect(report.isValid == false)
-        #expect(report.warning != nil)
-        #expect(report.avgDE == nil)
+        XCTAssertEqual(report.isValid, false)
+        XCTAssertNotNil(report.warning)
+        XCTAssertNil(report.avgDE)
     }
 
-    @Test("Status bands")
-    func statusBands() {
-        #expect(VerificationStatus.from(avgDE: 0.5) == .excellent)
-        #expect(VerificationStatus.from(avgDE: 1.5) == .good)
-        #expect(VerificationStatus.from(avgDE: 2.5) == .acceptable)
-        #expect(VerificationStatus.from(avgDE: 4.0) == .poor)
+    func testStatusBands() {
+        XCTAssertEqual(VerificationStatus.from(avgDE: 0.5), .excellent)
+        XCTAssertEqual(VerificationStatus.from(avgDE: 1.5), .good)
+        XCTAssertEqual(VerificationStatus.from(avgDE: 2.5), .acceptable)
+        XCTAssertEqual(VerificationStatus.from(avgDE: 4.0), .poor)
     }
 }

Tests/ICCeryCoreTests/ProfileInstallerTests.swift

@@ -1,5 +1,5 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
 /// A `FileManager` subclass that reports a temporary directory as the
@@ -18,8 +18,7 @@ private final class TestFileManager: FileManager {
     }
 }
 
-@Suite("ProfileInstaller")
-struct ProfileInstallerTests {
+final class ProfileInstallerTests: XCTestCase {
 
     private func makeTempDir() throws -> URL {
         let fm = FileManager.default
@@ -39,8 +38,7 @@ struct ProfileInstallerTests {
         return url
     }
 
-    @Test("Installs .icc to user ColorSync folder")
-    func userInstall() throws {
+    func testUserInstall() throws {
         let fm = FileManager.default
         let tmp = try makeTempDir()
         let testFM = TestFileManager(home: tmp)
@@ -51,15 +49,14 @@ struct ProfileInstallerTests {
             fileManager: testFM
         )
 
-        #expect(result.registered)
-        #expect(!result.overwritten)
-        #expect(!result.renamed)
-        #expect(result.destPath.hasSuffix("test.icc"))
-        #expect(fm.fileExists(atPath: result.destPath))
+        XCTAssertTrue(result.registered)
+        XCTAssertFalse(result.overwritten)
+        XCTAssertFalse(result.renamed)
+        XCTAssertTrue(result.destPath.hasSuffix("test.icc"))
+        XCTAssertTrue(fm.fileExists(atPath: result.destPath))
     }
 
-    @Test("Overwrite succeeds and replaces the existing file")
-    func overwriteSucceeds() throws {
+    func testOverwriteSucceeds() throws {
         let fm = FileManager.default
         let tmp = try makeTempDir()
         let testFM = TestFileManager(home: tmp)
@@ -70,7 +67,7 @@ struct ProfileInstallerTests {
             config: InstallProfileConfig(sourceURL: source),
             fileManager: testFM
         )
-        #expect(!first.overwritten)
+        XCTAssertFalse(first.overwritten)
 
         // Change the source contents.
         let newBytes: [UInt8] = (0..<256).map { UInt8(($0 + 100) % 256) }
@@ -87,15 +84,14 @@ struct ProfileInstallerTests {
             fileManager: testFM
         )
 
-        #expect(second.overwritten)
-        #expect(!second.renamed)
-        #expect(fm.fileExists(atPath: second.destPath))
+        XCTAssertTrue(second.overwritten)
+        XCTAssertFalse(second.renamed)
+        XCTAssertTrue(fm.fileExists(atPath: second.destPath))
         let installed = try Data(contentsOf: URL(fileURLWithPath: second.destPath))
-        #expect(Array(installed) == newBytes)
+        XCTAssertEqual(Array(installed), newBytes)
     }
 
-    @Test("Preserves .icm source extension")
-    func preservesIcmExtension() throws {
+    func testPreservesIcmExtension() throws {
         let tmp = try makeTempDir()
         let testFM = TestFileManager(home: tmp)
         let source = try makeSource(at: tmp, name: "m5_profile.icm")
@@ -105,12 +101,11 @@ struct ProfileInstallerTests {
             fileManager: testFM
         )
 
-        #expect(URL(fileURLWithPath: result.destPath).pathExtension == "icm")
-        #expect(result.destPath.hasSuffix("m5_profile.icm"))
+        XCTAssertEqual(URL(fileURLWithPath: result.destPath).pathExtension, "icm")
+        XCTAssertTrue(result.destPath.hasSuffix("m5_profile.icm"))
     }
 
-    @Test("Rejects parent traversal in source path")
-    func rejectsParentTraversal() throws {
+    func testRejectsParentTraversal() throws {
         let fm = FileManager.default
         let tmp = try makeTempDir()
 
@@ -125,20 +120,19 @@ struct ProfileInstallerTests {
         let sourceURL = tmp
             .appendingPathComponent("..")
             .appendingPathComponent(naughtyName)
-        #expect(fm.fileExists(atPath: sourceURL.path))
+        XCTAssertTrue(fm.fileExists(atPath: sourceURL.path))
 
         do {
             _ = try ProfileInstaller.install(config: InstallProfileConfig(sourceURL: sourceURL))
-            Issue.record("Expected unsafeStem error")
+            XCTFail("Expected unsafeStem error")
         } catch let error as ProfileInstallError {
-            if case .unsafeStem = error { } else { Issue.record("Expected unsafeStem, got \(error)") }
+            if case .unsafeStem = error { } else { XCTFail("Expected unsafeStem, got \(error)") }
         } catch {
-            Issue.record("Unexpected error type: \(error)")
+            XCTFail("Unexpected error type: \(error)")
         }
     }
 
-    @Test("Allows stems with consecutive dots like foo..bar")
-    func allowsDoubleDotStem() throws {
+    func testAllowsDoubleDotStem() throws {
         let fm = FileManager.default
         let tmp = try makeTempDir()
         let testFM = TestFileManager(home: tmp)
@@ -149,23 +143,22 @@ struct ProfileInstallerTests {
             fileManager: testFM
         )
 
-        #expect(result.destPath.hasSuffix("foo..bar.icc"))
-        #expect(fm.fileExists(atPath: result.destPath))
+        XCTAssertTrue(result.destPath.hasSuffix("foo..bar.icc"))
+        XCTAssertTrue(fm.fileExists(atPath: result.destPath))
     }
 
-    @Test("Rejects source files that are too small")
-    func rejectsSmallSource() throws {
+    func testRejectsSmallSource() throws {
         let tmp = try makeTempDir()
         let source = tmp.appendingPathComponent("tiny.icc")
         try Data(repeating: 0, count: 64).write(to: source)
 
         do {
             _ = try ProfileInstaller.install(config: InstallProfileConfig(sourceURL: source))
-            Issue.record("Expected sourceTooSmall error")
+            XCTFail("Expected sourceTooSmall error")
         } catch let error as ProfileInstallError {
-            if case .sourceTooSmall = error { } else { Issue.record("Expected sourceTooSmall, got \(error)") }
+            if case .sourceTooSmall = error { } else { XCTFail("Expected sourceTooSmall, got \(error)") }
         } catch {
-            Issue.record("Unexpected error type: \(error)")
+            XCTFail("Unexpected error type: \(error)")
         }
     }
 }

Tests/ICCeryCoreTests/SettingsTests.swift

@@ -1,5 +1,5 @@
-import Testing
 import Foundation
+import XCTest
 @testable import ICCeryCore
 
 private func tempStoreURL() -> URL {
@@ -8,92 +8,90 @@ private func tempStoreURL() -> URL {
         .appendingPathComponent("settings.json")
 }
 
-@Suite("AppSettings")
-struct AppSettingsTests {
-    @Test func defaults() {
+final class AppSettingsTests: XCTestCase {
+    func testDefaults() {
         let s = AppSettings.default
-        #expect(s.argyllBinaryDir == nil)
-        #expect(s.defaultInstrument == nil)
-        #expect(s.logLevel == nil)
-        #expect(s.deltaEGoodMax == 2.0)
-        #expect(s.deltaEWarningMax == 5.0)
-        #expect(s.customPresets.isEmpty)
-        #expect(!s.enableI1Pro2Leds)
-        #expect(s.calibrationStaleDays == 30)
-        #expect(s.defaultInstallLocation == .user)
-        #expect(s.askBeforeOverwriteProfile)
-        #expect(!s.openColorPanelAfterInstall)
-        #expect(s.isValid)
+        XCTAssertNil(s.argyllBinaryDir)
+        XCTAssertNil(s.defaultInstrument)
+        XCTAssertNil(s.logLevel)
+        XCTAssertEqual(s.deltaEGoodMax, 2.0)
+        XCTAssertEqual(s.deltaEWarningMax, 5.0)
+        XCTAssertTrue(s.customPresets.isEmpty)
+        XCTAssertFalse(s.enableI1Pro2Leds)
+        XCTAssertEqual(s.calibrationStaleDays, 30)
+        XCTAssertEqual(s.defaultInstallLocation, .user)
+        XCTAssertTrue(s.askBeforeOverwriteProfile)
+        XCTAssertFalse(s.openColorPanelAfterInstall)
+        XCTAssertTrue(s.isValid)
     }
 
-    @Test func negativeThresholds() {
+    func testNegativeThresholds() {
         var s = AppSettings.default
         s.deltaEGoodMax = -1
-        #expect(s.validate() == [AppSettings.errorNegativeDeltaE])
+        XCTAssertEqual(s.validate(), [AppSettings.errorNegativeDeltaE])
         s.deltaEGoodMax = 2.0
         s.deltaEWarningMax = -0.5
         // -0.5 < 0 → negative error; good(2.0) >= warn(-0.5) → order error too
-        #expect(s.validate() == [
+        XCTAssertTrue(s.validate() == [
             AppSettings.errorNegativeDeltaE,
             AppSettings.errorThresholdOrder,
         ])
     }
 
-    @Test func goodMustBeStrictlyLessThanWarning() {
+    func testGoodMustBeStrictlyLessThanWarning() {
         var s = AppSettings.default
         s.deltaEGoodMax = 5.0
-        #expect(s.validate() == [AppSettings.errorThresholdOrder])
+        XCTAssertEqual(s.validate(), [AppSettings.errorThresholdOrder])
         s.deltaEGoodMax = 6.0
-        #expect(s.validate() == [AppSettings.errorThresholdOrder])
+        XCTAssertEqual(s.validate(), [AppSettings.errorThresholdOrder])
         s.deltaEGoodMax = 4.9
-        #expect(s.isValid)
+        XCTAssertTrue(s.isValid)
     }
 
-    @Test func snakeCaseKeys() throws {
+    func testSnakeCaseKeys() throws {
         let s = AppSettings.default
         let data = try JSONEncoder().encode(s)
         let json = String(data: data, encoding: .utf8)!
-        #expect(json.contains("\"delta_e_good_max\""))
-        #expect(json.contains("\"default_install_location\""))
-        #expect(json.contains("\"enable_i1pro2_leds\""))
+        XCTAssertTrue(json.contains("\"delta_e_good_max\""))
+        XCTAssertTrue(json.contains("\"default_install_location\""))
+        XCTAssertTrue(json.contains("\"enable_i1pro2_leds\""))
     }
 }
 
-@Suite("SettingsStore")
-struct SettingsStoreTests {
-    @Test func roundTrip() throws {
+final class SettingsStoreTests: XCTestCase {
+    func testRoundTrip() throws {
         let url = tempStoreURL()
         let store = SettingsStore(fileURL: url)
         var s = AppSettings.default
         s.deltaEGoodMax = 1.5
         s.defaultInstrument = "p3"
         try store.save(s)
-        #expect(store.load() == s)
+        XCTAssertEqual(store.load(), s)
     }
 
-    @Test func corruptJsonFallsBackToDefaults() throws {
+    func testCorruptJsonFallsBackToDefaults() throws {
         let url = tempStoreURL()
         try FileManager.default.createDirectory(
             at: url.deletingLastPathComponent(), withIntermediateDirectories: true
         )
         try "{ not json".write(to: url, atomically: true, encoding: .utf8)
-        #expect(SettingsStore(fileURL: url).load() == .default)
+        XCTAssertEqual(SettingsStore(fileURL: url).load(), .default)
     }
 
-    @Test func missingFileReturnsDefaults() {
-        #expect(SettingsStore(fileURL: tempStoreURL()).load() == .default)
+    func testMissingFileReturnsDefaults() {
+        XCTAssertEqual(SettingsStore(fileURL: tempStoreURL()).load(), .default)
     }
 
-    @Test func invalidSettingsNotPersisted() throws {
+    func testInvalidSettingsNotPersisted() throws {
         let url = tempStoreURL()
         let store = SettingsStore(fileURL: url)
         var s = AppSettings.default
         s.deltaEGoodMax = 9.0 // >= warning 5.0
-        #expect(throws: SettingsStore.SettingsError.self) { try store.save(s) }
-        #expect(!FileManager.default.fileExists(atPath: url.path))
+        XCTAssertThrowsError(try store.save(s)) { error in XCTAssertTrue(error is SettingsStore.SettingsError) }
+        XCTAssertFalse(FileManager.default.fileExists(atPath: url.path))
     }
 
-    @Test func invalidSaveOverValidFilePreservesBytesAndPostsNothing() throws {
+    func testInvalidSaveOverValidFilePreservesBytesAndPostsNothing() throws {
         let url = tempStoreURL()
         let store = SettingsStore(fileURL: url)
         var valid = AppSettings.default
@@ -109,13 +107,13 @@ struct SettingsStoreTests {
 
         var invalid = AppSettings.default
         invalid.deltaEGoodMax = 9.0
-        #expect(throws: SettingsStore.SettingsError.self) { try store.save(invalid) }
-        #expect(try Data(contentsOf: url) == originalBytes)
-        #expect(!fired)
-        #expect(store.load() == valid)
+        XCTAssertThrowsError(try store.save(invalid)) { error in XCTAssertTrue(error is SettingsStore.SettingsError) }
+        XCTAssertEqual(try Data(contentsOf: url), originalBytes)
+        XCTAssertFalse(fired)
+        XCTAssertEqual(store.load(), valid)
     }
 
-    @Test func savePostsNotification() async throws {
+    func testSavePostsNotification() async throws {
         let url = tempStoreURL()
         let store = SettingsStore(fileURL: url)
         var fired = false
@@ -124,12 +122,11 @@ struct SettingsStoreTests {
         ) { _ in fired = true }
         defer { NotificationCenter.default.removeObserver(token) }
         try store.save(.default)
-        #expect(fired)
+        XCTAssertTrue(fired)
     }
 }
 
-@Suite("LogSink")
-struct LogSinkTests {
+final class LogSinkTests: XCTestCase {
     private func tempLog() -> (URL, LogSink) {
         let url = FileManager.default.temporaryDirectory
             .appendingPathComponent("iccery-log-\(UUID().uuidString)")
@@ -137,26 +134,26 @@ struct LogSinkTests {
         return (url, LogSink(fileURL: url))
     }
 
-    @Test func writesFormattedLines() {
+    func testWritesFormattedLines() {
         let (url, sink) = tempLog()
         sink.setLevel(.debug)
         sink.write(level: .info, category: "test", message: "hello")
         let content = (try? String(contentsOf: url, encoding: .utf8)) ?? ""
-        #expect(content.contains("[INFO] test: hello"))
+        XCTAssertTrue(content.contains("[INFO] test: hello"))
     }
 
-    @Test func levelFilteringIsLive() {
+    func testLevelFilteringIsLive() {
         let (url, sink) = tempLog()
         sink.setLevel(.error)
         sink.write(level: .info, category: "t", message: "hidden")
         sink.setLevel(.info)   // runtime change, no restart (#158)
         sink.write(level: .info, category: "t", message: "shown")
         let content = (try? String(contentsOf: url, encoding: .utf8)) ?? ""
-        #expect(!content.contains("hidden"))
-        #expect(content.contains("shown"))
+        XCTAssertFalse(content.contains("hidden"))
+        XCTAssertTrue(content.contains("shown"))
     }
 
-    @Test func rotatesAt5MiBKeeping5Segments() throws {
+    func testRotatesAt5MiBKeeping5Segments() throws {
         let (url, sink) = tempLog()
         sink.setLevel(.trace)
         // Pre-fill the active log just under the cap, then cross it.
@@ -167,20 +164,20 @@ struct LogSinkTests {
         try big.write(to: url, atomically: true, encoding: .utf8)
 
         sink.write(level: .info, category: "t", message: "trigger rotation")
-        #expect(FileManager.default.fileExists(
+        XCTAssertTrue(FileManager.default.fileExists(
             atPath: url.appendingPathExtension("1").path
         ))
         // Active log is small again.
         let size = try FileManager.default.attributesOfItem(
             atPath: url.path
         )[.size] as? UInt64
-        #expect((size ?? 0) < 1024)
+        XCTAssertTrue((size ?? 0) < 1024)
     }
 
-    @Test func tailExcerptCaps() throws {
+    func testTailExcerptCaps() throws {
         let (url, sink) = tempLog()
         sink.setLevel(.debug)
         sink.write(level: .info, category: "t", message: "line")
-        #expect(sink.tailExcerpt(maxBytes: 8).count <= 8)
+        XCTAssertTrue(sink.tailExcerpt(maxBytes: 8).count <= 8)
     }
 }

Tests/ICCeryCoreTests/TargenTests.swift

@@ -1,12 +1,10 @@
-import Testing
+import XCTest
 import Foundation
 @testable import ICCeryCore
 
-@Suite("TargenArgs")
-struct TargenArgsTests {
+final class TargenArgsTests: XCTestCase {
 
-    @Test("RGB baseline: -v -d 2 -f 800 -e 4 -B 4")
-    func rgbBaseline() throws {
+    func testRgbBaseline() throws {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 800,
@@ -15,12 +13,11 @@ struct TargenArgsTests {
             basename: "test_rgb"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(args == ["-v", "-d", "2", "-f", "800", "-e", "4", "-B", "4", "test_rgb"])
-        #expect(!args.contains("-u"))
+        XCTAssertEqual(args, ["-v", "-d", "2", "-f", "800", "-e", "4", "-B", "4", "test_rgb"])
+        XCTAssertFalse(args.contains("-u"))
     }
 
-    @Test("CMYK baseline: -v -d 4 -f 1500 -e 4 -B 0")
-    func cmykBaseline() throws {
+    func testCmykBaseline() throws {
         let config = TargenConfig(
             colourSpace: .cmyk,
             patchCount: 1500,
@@ -29,11 +26,10 @@ struct TargenArgsTests {
             basename: "test_cmyk"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(args == ["-v", "-d", "4", "-f", "1500", "-e", "4", "-B", "0", "test_cmyk"])
+        XCTAssertEqual(args, ["-v", "-d", "4", "-f", "1500", "-e", "4", "-B", "0", "test_cmyk"])
     }
 
-    @Test("Custom patch count honours -f (#44)")
-    func customPatchCount() throws {
+    func testCustomPatchCount() throws {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 2500,
@@ -42,12 +38,11 @@ struct TargenArgsTests {
             basename: "custom_patches"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(args.contains("-f"))
-        #expect(args[args.firstIndex(of: "-f")! + 1] == "2500")
+        XCTAssertTrue(args.contains("-f"))
+        XCTAssertEqual(args[args.firstIndex(of: "-f")! + 1], "2500")
     }
 
-    @Test("All advanced flags in stable order")
-    func allAdvancedFlags() throws {
+    func testAllAdvancedFlags() throws {
         let config = TargenConfig(
             colourSpace: .cmyk,
             patchCount: 1200,
@@ -85,11 +80,10 @@ struct TargenArgsTests {
             "-p", "2.00",
             "advanced_cmyk"
         ]
-        #expect(args == expected)
+        XCTAssertEqual(args, expected)
     }
 
-    @Test("RGB ignores total ink limit")
-    func rgbIgnoresInkLimit() throws {
+    func testRgbIgnoresInkLimit() throws {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 800,
@@ -99,11 +93,10 @@ struct TargenArgsTests {
             basename: "rgb_no_ink"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(!args.contains("-l"))
+        XCTAssertFalse(args.contains("-l"))
     }
 
-    @Test("Neutral concentration omitted when approximately 0.50")
-    func neutralConcentrationOmittedWhenDefault() throws {
+    func testNeutralConcentrationOmittedWhenDefault() throws {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 800,
@@ -113,11 +106,10 @@ struct TargenArgsTests {
             basename: "n_default"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(!args.contains("-N"))
+        XCTAssertFalse(args.contains("-N"))
     }
 
-    @Test("Adaptation emitted even at 0.10 (no default-skip)")
-    func adaptationEmittedAtPointOne() throws {
+    func testAdaptationEmittedAtPointOne() throws {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 800,
@@ -127,12 +119,11 @@ struct TargenArgsTests {
             basename: "a_flag"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(args.contains("-A"))
-        #expect(args[args.firstIndex(of: "-A")! + 1] == "0.10")
+        XCTAssertTrue(args.contains("-A"))
+        XCTAssertEqual(args[args.firstIndex(of: "-A")! + 1], "0.10")
     }
 
-    @Test("OFPS full spread algorithm emits no flag")
-    func ofpsEmitsNoFlag() throws {
+    func testOfpsEmitsNoFlag() throws {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 800,
@@ -142,12 +133,11 @@ struct TargenArgsTests {
             basename: "ofps_test"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(!args.contains("ofps"))
-        #expect(!args.contains("-t"))
+        XCTAssertFalse(args.contains("ofps"))
+        XCTAssertFalse(args.contains("-t"))
     }
 
-    @Test("Dark emphasis and device power omitted when 1.0")
-    func darkEmphasisAndPowerOmittedWhenOne() throws {
+    func testDarkEmphasisAndPowerOmittedWhenOne() throws {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 800,
@@ -158,12 +148,11 @@ struct TargenArgsTests {
             basename: "defaults_omitted"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(!args.contains("-V"))
-        #expect(!args.contains("-p"))
+        XCTAssertFalse(args.contains("-V"))
+        XCTAssertFalse(args.contains("-p"))
     }
 
-    @Test("Whitespace-only preconditioning profile emits no -c")
-    func whitespacePreconditioner() throws {
+    func testWhitespacePreconditioner() throws {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 800,
@@ -173,11 +162,10 @@ struct TargenArgsTests {
             basename: "ws_pre"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(!args.contains("-c"))
+        XCTAssertFalse(args.contains("-c"))
     }
 
-    @Test("Preconditioning profile is trimmed before emission")
-    func preconditionerTrimmed() throws {
+    func testPreconditionerTrimmed() throws {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 800,
@@ -187,11 +175,10 @@ struct TargenArgsTests {
             basename: "trim_pre"
         )
         let args = try TargenArgs.build(config: config)
-        #expect(args[args.firstIndex(of: "-c")! + 1] == "/path/to/profile.icc")
+        XCTAssertEqual(args[args.firstIndex(of: "-c")! + 1], "/path/to/profile.icc")
     }
 
-    @Test("Invalid basename throws")
-    func invalidBasenameThrows() {
+    func testInvalidBasenameThrows() {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 800,
@@ -199,13 +186,12 @@ struct TargenArgsTests {
             blackPatches: 4,
             basename: "../bad_name"
         )
-        #expect(throws: PathSecurity.Error.self) {
-            try TargenArgs.build(config: config)
+        XCTAssertThrowsError(try TargenArgs.build(config: config)) { error in
+            XCTAssertTrue(error is PathSecurity.Error)
         }
     }
 
-    @Test("Invalid patch count throws")
-    func invalidPatchCountThrows() {
+    func testInvalidPatchCountThrows() {
         let config = TargenConfig(
             colourSpace: .rgb,
             patchCount: 0,
@@ -213,13 +199,12 @@ struct TargenArgsTests {
             blackPatches: 4,
             basename: "bad_count"
         )
-        #expect(throws: TargenArgError.self) {
-            try TargenArgs.build(config: config)
+        XCTAssertThrowsError(try TargenArgs.build(config: config)) { error in
+            XCTAssertTrue(error is TargenArgError)
         }
     }
 
-    @Test("Invalid ink limit throws for CMYK")
-    func invalidInkLimitThrows() {
+    func testInvalidInkLimitThrows() {
         let config = TargenConfig(
             colourSpace: .cmyk,
             patchCount: 800,
@@ -228,17 +213,15 @@ struct TargenArgsTests {
             totalInkLimit: 450,
             basename: "bad_ink"
         )
-        #expect(throws: TargenArgError.self) {
-            try TargenArgs.build(config: config)
+        XCTAssertThrowsError(try TargenArgs.build(config: config)) { error in
+            XCTAssertTrue(error is TargenArgError)
         }
     }
 }
 
-@Suite("ArgyllRunner Targen")
-struct ArgyllRunnerTargenTests {
+final class ArgyllRunnerTargenTests: XCTestCase {
 
-    @Test("Successful targen execution creates .ti1 and returns URL")
-    func successfulTargenExecution() async throws {
+    func testSuccessfulTargenExecution() async throws {
         let tempDir = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try FileManager.default.createDirectory(at: tempDir, withIntermediateDirectories: true)
         defer { try? FileManager.default.removeItem(at: tempDir) }
@@ -284,14 +267,13 @@ struct ArgyllRunnerTargenTests {
             box.append(batch)
         }
         logLines = box.lines
-        #expect(logLines.contains("Generating patches..."))
+        XCTAssertTrue(logLines.contains("Generating patches..."))
 
-        #expect(FileManager.default.fileExists(atPath: ti1URL.path))
-        #expect(ti1URL.lastPathComponent == "mock_test.ti1")
+        XCTAssertTrue(FileManager.default.fileExists(atPath: ti1URL.path))
+        XCTAssertEqual(ti1URL.lastPathComponent, "mock_test.ti1")
     }
 
-    @Test("Failed targen execution throws toolFailed")
-    func failedTargenExecution() async throws {
+    func testFailedTargenExecution() async throws {
         let tempDir = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try FileManager.default.createDirectory(at: tempDir, withIntermediateDirectories: true)
         defer { try? FileManager.default.removeItem(at: tempDir) }
@@ -318,14 +300,15 @@ struct ArgyllRunnerTargenTests {
             workingDirectory: tempDir
         )
 
-        await #expect(throws: ArgyllRunnerError.toolFailed(
-            tool: "targen", code: 1, logs: ["Error: something went wrong"])) {
+        await assertAsyncThrows(expectedType: ArgyllRunnerError.self) {
             try await runner.runTargen(config: config)
+        } errorHandler: { error in
+            XCTAssertEqual(error, .toolFailed(
+                tool: "targen", code: 1, logs: ["Error: something went wrong"]))
         }
     }
 
-    @Test("Targen exit 0 without .ti1 throws missingArtefact")
-    func missingArtefactThrows() async throws {
+    func testMissingArtefactThrows() async throws {
         let tempDir = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try FileManager.default.createDirectory(at: tempDir, withIntermediateDirectories: true)
         defer { try? FileManager.default.removeItem(at: tempDir) }
@@ -352,9 +335,11 @@ struct ArgyllRunnerTargenTests {
             workingDirectory: tempDir
         )
 
-        await #expect(throws: ArgyllRunnerError.missingArtefact(
-            tempDir.appendingPathComponent("no_file.ti1").path)) {
+        await assertAsyncThrows(expectedType: ArgyllRunnerError.self) {
             try await runner.runTargen(config: config)
+        } errorHandler: { error in
+            XCTAssertEqual(error, .missingArtefact(
+                tempDir.appendingPathComponent("no_file.ti1").path))
         }
     }
 }

Tests/ICCeryCoreTests/TargetWorkflowViewModelTests.swift

@@ -1,17 +1,15 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 @testable import ICCery
 
 /// Dataset-import error contracts through the
 /// `importMeasurementDataset(from:)` seam (issue #80): parser and I/O
 /// failures must surface identically as a single `.error` Notice.
-@Suite("TargetWorkflowViewModel dataset import")
 @MainActor
-struct TargetWorkflowViewModelTests {
+final class TargetWorkflowViewModelTests: XCTestCase {
 
-    @Test("Malformed content (CGATSParseError) produces one .error notice prefixed 'Import failed:'")
-    func malformedDatasetNotice() throws {
+    func testMalformedDatasetNotice() throws {
         let env = try TestAppEnvironment.make()
         defer { env.cleanup() }
         let vm = TargetWorkflowViewModel(environment: env.environment)
@@ -21,13 +19,12 @@ struct TargetWorkflowViewModelTests {
 
         vm.importMeasurementDataset(from: bad)
 
-        let notice = try #require(vm.wizard.notice)
-        #expect(notice.kind == .error)
-        #expect(notice.text.hasPrefix("Import failed:"))
+        let notice = try XCTUnwrap(vm.wizard.notice)
+        XCTAssertEqual(notice.kind, .error)
+        XCTAssertTrue(notice.text.hasPrefix("Import failed:"))
     }
 
-    @Test("Missing file (CocoaError) produces one .error notice prefixed 'Import failed:'")
-    func missingDatasetNotice() throws {
+    func testMissingDatasetNotice() throws {
         let env = try TestAppEnvironment.make()
         defer { env.cleanup() }
         let vm = TargetWorkflowViewModel(environment: env.environment)
@@ -35,8 +32,8 @@ struct TargetWorkflowViewModelTests {
         let missing = env.root.appendingPathComponent("does-not-exist.ti3")
         vm.importMeasurementDataset(from: missing)
 
-        let notice = try #require(vm.wizard.notice)
-        #expect(notice.kind == .error)
-        #expect(notice.text.hasPrefix("Import failed:"))
+        let notice = try XCTUnwrap(vm.wizard.notice)
+        XCTAssertEqual(notice.kind, .error)
+        XCTAssertTrue(notice.text.hasPrefix("Import failed:"))
     }
 }

Tests/ICCeryCoreTests/TestAppEnvironment.swift

@@ -1,4 +1,3 @@
-import Testing
 import Foundation
 @testable import ICCeryCore
 @testable import ICCery

Tests/ICCeryCoreTests/VerificationHistoryStoreTests.swift

@@ -1,12 +1,10 @@
 import Foundation
-import Testing
+import XCTest
 @testable import ICCeryCore
 
-@Suite("VerificationHistoryStore")
-struct VerificationHistoryStoreTests {
+final class VerificationHistoryStoreTests: XCTestCase {
 
-    @Test("Append and cap")
-    func appendAndCap() async throws {
+    func testAppendAndCap() async throws {
         let fm = FileManager.default
         let tmp = fm.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try fm.createDirectory(at: tmp, withIntermediateDirectories: true)
@@ -29,12 +27,11 @@ struct VerificationHistoryStoreTests {
         }
 
         let all = await store.all()
-        #expect(all.count == 3)
-        #expect(all.first?.avgDE == 2.0)
+        XCTAssertEqual(all.count, 3)
+        XCTAssertEqual(all.first?.avgDE, 2.0)
     }
 
-    @Test("Parse failure preserves file")
-    func parseFailurePreservesFile() async {
+    func testParseFailurePreservesFile() async {
         let fm = FileManager.default
         let tmp = fm.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try? fm.createDirectory(at: tmp, withIntermediateDirectories: true)
@@ -45,14 +42,13 @@ struct VerificationHistoryStoreTests {
         let store = VerificationHistoryStore(url: url)
         do {
             _ = try await store.load()
-            Issue.record("load() should throw on invalid JSON")
+            XCTFail("load() should throw on invalid JSON")
         } catch {
-            #expect(fm.fileExists(atPath: url.path))
+            XCTAssertTrue(fm.fileExists(atPath: url.path))
         }
     }
 
-    @Test("Append loads existing records first")
-    func appendLoadsExisting() async throws {
+    func testAppendLoadsExisting() async throws {
         let fm = FileManager.default
         let tmp = fm.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try fm.createDirectory(at: tmp, withIntermediateDirectories: true)
@@ -89,13 +85,12 @@ struct VerificationHistoryStoreTests {
         _ = try await store2.append(new)
 
         let all = await store2.all()
-        #expect(all.count == 2)
-        #expect(all.contains { $0.id == "vr-existing" })
-        #expect(all.contains { $0.id == "vr-new" })
+        XCTAssertEqual(all.count, 2)
+        XCTAssertTrue(all.contains { $0.id == "vr-existing" })
+        XCTAssertTrue(all.contains { $0.id == "vr-new" })
     }
 
-    @Test("Append does not overwrite an unparseable file")
-    func appendPreservesUnparseableFile() async {
+    func testAppendPreservesUnparseableFile() async {
         let fm = FileManager.default
         let tmp = fm.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try? fm.createDirectory(at: tmp, withIntermediateDirectories: true)
@@ -119,20 +114,19 @@ struct VerificationHistoryStoreTests {
 
         do {
             _ = try await store.append(record)
-            Issue.record("append() should propagate the load error")
+            XCTFail("append() should propagate the load error")
         } catch {
-            #expect(fm.fileExists(atPath: url.path))
+            XCTAssertTrue(fm.fileExists(atPath: url.path))
             if let data = try? Data(contentsOf: url),
                let contents = String(data: data, encoding: .utf8) {
-                #expect(contents == badJSON)
+                XCTAssertEqual(contents, badJSON)
             } else {
-                Issue.record("Could not read preserved file")
+                XCTFail("Could not read preserved file")
             }
         }
     }
 
-    @Test("Clear does not overwrite an unparseable file")
-    func clearPreservesUnparseableFile() async {
+    func testClearPreservesUnparseableFile() async {
         let fm = FileManager.default
         let tmp = fm.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try? fm.createDirectory(at: tmp, withIntermediateDirectories: true)
@@ -144,15 +138,14 @@ struct VerificationHistoryStoreTests {
         let store = VerificationHistoryStore(url: url)
         do {
             try await store.clear()
-            Issue.record("clear() should propagate the load error")
+            XCTFail("clear() should propagate the load error")
         } catch {
             let contents = try? String(contentsOf: url, encoding: .utf8)
-            #expect(contents == badJSON)
+            XCTAssertEqual(contents, badJSON)
         }
     }
 
-    @Test("ISO-8601 timestamps round-trip through a fresh store")
-    func iso8601RoundTrip() async throws {
+    func testIso8601RoundTrip() async throws {
         let fm = FileManager.default
         let tmp = fm.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try fm.createDirectory(at: tmp, withIntermediateDirectories: true)
@@ -174,16 +167,15 @@ struct VerificationHistoryStoreTests {
         _ = try await store1.append(record)
 
         let text = try String(contentsOf: url, encoding: .utf8)
-        #expect(text.contains(ISO8601DateFormatter().string(from: timestamp)))
+        XCTAssertTrue(text.contains(ISO8601DateFormatter().string(from: timestamp)))
 
         let store2 = VerificationHistoryStore(url: url)
         let loaded = try await store2.load()
-        #expect(loaded.count == 1)
-        #expect(loaded.first?.timestamp == timestamp)
+        XCTAssertEqual(loaded.count, 1)
+        XCTAssertEqual(loaded.first?.timestamp, timestamp)
     }
 
-    @Test("CSV export quoting")
-    func csvQuoting() async throws {
+    func testCsvQuoting() async throws {
         let fm = FileManager.default
         let tmp = fm.temporaryDirectory.appendingPathComponent(UUID().uuidString)
         try fm.createDirectory(at: tmp, withIntermediateDirectories: true)
@@ -204,7 +196,7 @@ struct VerificationHistoryStoreTests {
         _ = try await store.append(record)
 
         let csv = await store.exportCSV()
-        #expect(csv.contains("\"a,b\""))
-        #expect(csv.contains("\"\"quoted\"\""))
+        XCTAssertTrue(csv.contains("\"a,b\""))
+        XCTAssertTrue(csv.contains("\"\"quoted\"\""))
     }
 }

Tests/ICCeryCoreTests/WizardCalibrationSessionTests.swift

@@ -1,13 +1,12 @@
-import Testing
 import Foundation
+import XCTest
 @testable import ICCeryCore
 @testable import ICCery
 
 /// Issue #29 — `CAL_` basename must be restored on relaunch and on any
 /// attempt to navigate to a non-calibration stage that would use it.
-@Suite("WizardCalibrationSession")
 @MainActor
-struct WizardCalibrationSessionTests {
+final class WizardCalibrationSessionTests: XCTestCase {
 
     private func tempURL() -> URL {
         FileManager.default.temporaryDirectory
@@ -24,8 +23,7 @@ struct WizardCalibrationSessionTests {
         return url
     }
 
-    @Test("Persist and restore calibrationOriginalBasename across a relaunch")
-    func relaunchRestoresOriginal() throws {
+    func testRelaunchRestoresOriginal() throws {
         let url = tempURL()
         let store = WizardStateStore(fileURL: url)
         var saved = WizardState(
@@ -39,14 +37,13 @@ struct WizardCalibrationSessionTests {
 
         let model = WizardViewModel(stateStore: store)
 
-        #expect(model.basename == "DemoTarget")
-        #expect(model.calibrationOriginalBasename == "")
-        #expect(model.sessionMode == .profile)
-        #expect(model.stage == .generate)
+        XCTAssertEqual(model.basename, "DemoTarget")
+        XCTAssertEqual(model.calibrationOriginalBasename, "")
+        XCTAssertEqual(model.sessionMode, .profile)
+        XCTAssertEqual(model.stage, .generate)
     }
 
-    @Test("go(to: .buildProfile) while basename is CAL_ refuses and restores the original")
-    func goToBuildProfileRefusesAndRestores() throws {
+    func testGoToBuildProfileRefusesAndRestores() throws {
         let dir = try tempDir()
         let url = tempURL()
         let store = WizardStateStore(fileURL: url)
@@ -60,14 +57,13 @@ struct WizardCalibrationSessionTests {
 
         model.go(to: .buildProfile)
 
-        #expect(model.basename == "DemoTarget")
-        #expect(model.calibrationOriginalBasename == "")
-        #expect(model.sessionMode == .profile)
-        #expect(model.stage == .calibrate)
+        XCTAssertEqual(model.basename, "DemoTarget")
+        XCTAssertEqual(model.calibrationOriginalBasename, "")
+        XCTAssertEqual(model.sessionMode, .profile)
+        XCTAssertEqual(model.stage, .calibrate)
     }
 
-    @Test("go(to: .layOutPrint) while basename is CAL_ stays in calibration")
-    func goToLayoutStaysCal() throws {
+    func testGoToLayoutStaysCal() throws {
         let dir = try tempDir()
         let url = tempURL()
         let store = WizardStateStore(fileURL: url)
@@ -81,9 +77,9 @@ struct WizardCalibrationSessionTests {
 
         model.go(to: .layOutPrint)
 
-        #expect(model.basename == "CAL_DemoTarget")
-        #expect(model.calibrationOriginalBasename == "DemoTarget")
-        #expect(model.sessionMode == .calibration)
-        #expect(model.stage == .layOutPrint)
+        XCTAssertEqual(model.basename, "CAL_DemoTarget")
+        XCTAssertEqual(model.calibrationOriginalBasename, "DemoTarget")
+        XCTAssertEqual(model.sessionMode, .calibration)
+        XCTAssertEqual(model.stage, .layOutPrint)
     }
 }

Tests/ICCeryCoreTests/WizardGatingTests.swift

@@ -1,5 +1,5 @@
-import Testing
 import Foundation
+import XCTest
 @testable import ICCeryCore
 
 private func artefacts(
@@ -16,77 +16,75 @@ private func artefacts(
     return a
 }
 
-@Suite("WizardGating matrix")
-struct WizardGatingTests {
+final class WizardGatingTests: XCTestCase {
 
-    @Test func emptyProjectOnlyStage1() {
+    func testEmptyProjectOnlyStage1() {
         let a = artefacts()
-        #expect(WizardGating.isUnlocked(.generate, artefacts: a))
-        #expect(WizardGating.isUnlocked(.calibrate, artefacts: a))
+        XCTAssertTrue(WizardGating.isUnlocked(.generate, artefacts: a))
+        XCTAssertTrue(WizardGating.isUnlocked(.calibrate, artefacts: a))
         for s in [WizardStage.layOutPrint, .measure, .buildProfile, .verifyInstall] {
-            #expect(!WizardGating.isUnlocked(s, artefacts: a), "\(s) should be locked")
+            XCTAssertFalse(WizardGating.isUnlocked(s, artefacts: a), "\(s) should be locked")
         }
     }
 
-    @Test func ti1UnlocksStage2Only() {
+    func testTi1UnlocksStage2Only() {
         let a = artefacts(ti1: true)
-        #expect(WizardGating.isUnlocked(.layOutPrint, artefacts: a))
-        #expect(!WizardGating.isUnlocked(.measure, artefacts: a))
-        #expect(!WizardGating.isUnlocked(.buildProfile, artefacts: a))
-        #expect(!WizardGating.isUnlocked(.verifyInstall, artefacts: a))
+        XCTAssertTrue(WizardGating.isUnlocked(.layOutPrint, artefacts: a))
+        XCTAssertFalse(WizardGating.isUnlocked(.measure, artefacts: a))
+        XCTAssertFalse(WizardGating.isUnlocked(.buildProfile, artefacts: a))
+        XCTAssertFalse(WizardGating.isUnlocked(.verifyInstall, artefacts: a))
     }
 
-    @Test func stage3NeedsTi1AndTi2() {
-        #expect(!WizardGating.isUnlocked(.measure, artefacts: artefacts(ti2: true)))
-        #expect(WizardGating.isUnlocked(.measure, artefacts: artefacts(ti1: true, ti2: true)))
+    func testStage3NeedsTi1AndTi2() {
+        XCTAssertFalse(WizardGating.isUnlocked(.measure, artefacts: artefacts(ti2: true)))
+        XCTAssertTrue(WizardGating.isUnlocked(.measure, artefacts: artefacts(ti1: true, ti2: true)))
     }
 
-    @Test func stage4NeedsTi3NotTi2() {
+    func testStage4NeedsTi3NotTi2() {
         // #109/#110: .ti2 alone must never unlock Stage 4.
         let a = artefacts(ti1: true, ti2: true)
-        #expect(!WizardGating.isUnlocked(.buildProfile, artefacts: a))
-        #expect(WizardGating.isUnlocked(.buildProfile, artefacts: artefacts(ti3: true)))
+        XCTAssertFalse(WizardGating.isUnlocked(.buildProfile, artefacts: a))
+        XCTAssertTrue(WizardGating.isUnlocked(.buildProfile, artefacts: artefacts(ti3: true)))
     }
 
-    @Test func stage5NeedsTi3AndProfile() {
-        #expect(!WizardGating.isUnlocked(.verifyInstall, artefacts: artefacts(ti3: true)))
-        #expect(!WizardGating.isUnlocked(.verifyInstall, artefacts: artefacts(profile: true)))
-        #expect(WizardGating.isUnlocked(
+    func testStage5NeedsTi3AndProfile() {
+        XCTAssertFalse(WizardGating.isUnlocked(.verifyInstall, artefacts: artefacts(ti3: true)))
+        XCTAssertFalse(WizardGating.isUnlocked(.verifyInstall, artefacts: artefacts(profile: true)))
+        XCTAssertTrue(WizardGating.isUnlocked(
             .verifyInstall, artefacts: artefacts(ti3: true, profile: true)
         ))
     }
 
-    @Test func forwardGatedBackwardFree() {
+    func testForwardGatedBackwardFree() {
         let a = artefacts()
-        #expect(!WizardGating.canNavigate(to: .layOutPrint, from: .generate, artefacts: a))
+        XCTAssertFalse(WizardGating.canNavigate(to: .layOutPrint, from: .generate, artefacts: a))
         // Backward always allowed even when artefacts vanished.
-        #expect(WizardGating.canNavigate(to: .generate, from: .measure, artefacts: a))
+        XCTAssertTrue(WizardGating.canNavigate(to: .generate, from: .measure, artefacts: a))
         // Same stage is a no-op.
-        #expect(WizardGating.canNavigate(to: .measure, from: .measure, artefacts: a))
+        XCTAssertTrue(WizardGating.canNavigate(to: .measure, from: .measure, artefacts: a))
         // Stage 0 is a side-trip, never gated.
-        #expect(WizardGating.canNavigate(to: .calibrate, from: .generate, artefacts: a))
+        XCTAssertTrue(WizardGating.canNavigate(to: .calibrate, from: .generate, artefacts: a))
     }
 
-    @Test func deepestUnlocked() {
-        #expect(WizardGating.deepestUnlocked(artefacts: artefacts()) == .generate)
-        #expect(WizardGating.deepestUnlocked(
+    func testDeepestUnlocked() {
+        XCTAssertEqual(WizardGating.deepestUnlocked(artefacts: artefacts()), .generate)
+        XCTAssertEqual(WizardGating.deepestUnlocked(
             artefacts: artefacts(ti1: true, ti2: true)
-        ) == .measure)
-        #expect(WizardGating.deepestUnlocked(
+        ), .measure)
+        XCTAssertEqual(WizardGating.deepestUnlocked(
             artefacts: artefacts(ti3: true, profile: true)
-        ) == .verifyInstall)
+        ), .verifyInstall)
     }
 }
 
-@Suite("WizardStateStore")
-struct WizardStateStoreTests {
+final class WizardStateStoreTests: XCTestCase {
     private func tempURL() -> URL {
         FileManager.default.temporaryDirectory
             .appendingPathComponent("iccery-wiz-\(UUID().uuidString)")
             .appendingPathComponent("wizard_state.json")
     }
 
-    @Test func roundTrip() throws {
+    func testRoundTrip() throws {
         let url = tempURL()
         let store = WizardStateStore(fileURL: url)
         var s = WizardState()
@@ -97,43 +95,43 @@ struct WizardStateStoreTests {
         s.profileBasename = "imported"
         s.calibrationOriginalBasename = "pre-cal"
         try store.save(s)
-        #expect(store.load() == s)
+        XCTAssertEqual(store.load(), s)
     }
 
-    @Test func missingFileDefaults() {
+    func testMissingFileDefaults() {
         let s = WizardStateStore(fileURL: tempURL()).load()
-        #expect(s == .default)
-        #expect(s.stage == .generate)
-        #expect(s.sessionMode == .profile)
+        XCTAssertEqual(s, .default)
+        XCTAssertEqual(s.stage, .generate)
+        XCTAssertEqual(s.sessionMode, .profile)
     }
 
-    @Test func corruptStageFallsBackToGenerate() throws {
+    func testCorruptStageFallsBackToGenerate() throws {
         let url = tempURL()
         try FileManager.default.createDirectory(
             at: url.deletingLastPathComponent(), withIntermediateDirectories: true
         )
         try #"{"current_stage": 99, "basename": "", "cwd": "", "session_mode": "profile"}"#
             .write(to: url, atomically: true, encoding: .utf8)
-        #expect(WizardStateStore(fileURL: url).load().stage == .generate)
+        XCTAssertEqual(WizardStateStore(fileURL: url).load().stage, .generate)
     }
 
-    @Test func corruptJsonReturnsDefaultAndKeepsBytes() throws {
+    func testCorruptJsonReturnsDefaultAndKeepsBytes() throws {
         let url = tempURL()
         try FileManager.default.createDirectory(
             at: url.deletingLastPathComponent(), withIntermediateDirectories: true
         )
         try "not json".write(to: url, atomically: true, encoding: .utf8)
-        #expect(WizardStateStore(fileURL: url).load() == .default)
+        XCTAssertEqual(WizardStateStore(fileURL: url).load(), .default)
         let kept = try String(contentsOf: url, encoding: .utf8)
-        #expect(kept == "not json")
+        XCTAssertEqual(kept, "not json")
     }
 
-    @Test func sessionModeCalibrationRoundTrips() throws {
+    func testSessionModeCalibrationRoundTrips() throws {
         var s = WizardState(sessionMode: .calibration)
         let data = try JSONEncoder().encode(s)
         let decoded = try JSONDecoder().decode(WizardState.self, from: data)
-        #expect(decoded.sessionMode == .calibration)
+        XCTAssertEqual(decoded.sessionMode, .calibration)
         s.sessionMode = .profile
-        #expect(s.sessionMode == .profile)
+        XCTAssertEqual(s.sessionMode, .profile)
     }
 }

Tests/ICCeryCoreTests/XCTestCase+AsyncThrows.swift

@@ -0,0 +1,21 @@
+import XCTest
+
+extension XCTestCase {
+    func assertAsyncThrows<T, E: Error>(
+        expectedType: E.Type,
+        _ expression: () async throws -> T,
+        _ message: @autoclosure () -> String = "",
+        file: StaticString = #filePath,
+        line: UInt = #line,
+        errorHandler: ((E) -> Void)? = nil
+    ) async {
+        do {
+            _ = try await expression()
+            XCTFail("Expected \(expectedType) to be thrown but expression succeeded. \(message())", file: file, line: line)
+        } catch let error as E {
+            errorHandler?(error)
+        } catch {
+            XCTFail("Expected \(expectedType) but caught \(type(of: error)): \(error). \(message())", file: file, line: line)
+        }
+    }
+}

Tests/ICCeryUITests/Milestone6CalibrationUITests.swift

@@ -32,6 +32,7 @@ final class Milestone6CalibrationUITests: XCTestCase {
             "ICCERY_TEST_WORKDIR": testWorkDir.path
         ]
         app.launch()
+        app.activate()
     }
 
     override func tearDown() async throws {
@@ -104,6 +105,7 @@ final class Milestone6CalibrationUITests: XCTestCase {
         app.launchEnvironment["ICCERY_TEST_ROOT"] = testRoot.path
         app.launchEnvironment["ICCERY_MOCK_TARGEN_EXIT"] = "2"
         app.launch()
+        app.activate()
 
         let calButton = app.buttons["btnCalibratePrinter"]
         XCTAssertTrue(calButton.waitForExistence(timeout: 10))

project.yml

@@ -2,7 +2,7 @@ name: ICCery
 options:
   bundleIdPrefix: com.gronod
   deploymentTarget:
-    macOS: "14.0"
+    macOS: "12.0"
   groupSortPosition: top
 
 packages:
@@ -13,7 +13,7 @@ targets:
   ICCery:
     type: application
     platform: macOS
-    deploymentTarget: "14.0"
+    deploymentTarget: "12.0"
     sources:
       - path: Sources/ICCery
       - path: Resources
@@ -46,7 +46,7 @@ targets:
         PRODUCT_BUNDLE_PACKAGE_TYPE: APPL
         GENERATE_INFOPLIST_FILE: YES
         INFOPLIST_KEY_CFBundleDisplayName: ICCery
-        INFOPLIST_KEY_LSMinimumSystemVersion: "14.0"
+        INFOPLIST_KEY_LSMinimumSystemVersion: "12.0"
         INFOPLIST_KEY_NSPrincipalClass: NSApplication
         INFOPLIST_KEY_NSHumanReadableCopyright: "Copyright © 2026 Gronod. AGPLv3."
         MARKETING_VERSION: "2.0.0"
@@ -58,15 +58,15 @@ targets:
         ENABLE_APP_SANDBOX: NO
         ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
         ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME: AccentColor
-        SWIFT_VERSION: "6.0"
-        SWIFT_STRICT_CONCURRENCY: complete
-        MACOSX_DEPLOYMENT_TARGET: "14.0"
+        SWIFT_VERSION: "5.0"
+        OTHER_SWIFT_FLAGS: ["$(inherited)", "-strict-concurrency=minimal"]
+        MACOSX_DEPLOYMENT_TARGET: "12.0"
         ARCHS: "$(ARCHS_STANDARD)"
 
   ICCeryCoreTests:
     type: bundle.unit-test
     platform: macOS
-    deploymentTarget: "14.0"
+    deploymentTarget: "12.0"
     sources:
       - path: Tests/ICCeryCoreTests
     dependencies:
@@ -79,13 +79,13 @@ targets:
         TEST_HOST: "$(BUILT_PRODUCTS_DIR)/ICCery.app/Contents/MacOS/ICCery"
         GENERATE_INFOPLIST_FILE: YES
         CODE_SIGN_IDENTITY: "-"
-        SWIFT_VERSION: "6.0"
-        MACOSX_DEPLOYMENT_TARGET: "14.0"
+        SWIFT_VERSION: "5.0"
+        MACOSX_DEPLOYMENT_TARGET: "12.0"
 
   ICCeryUITests:
     type: bundle.ui-testing
     platform: macOS
-    deploymentTarget: "14.0"
+    deploymentTarget: "12.0"
     sources:
       - path: Tests/ICCeryUITests
     dependencies:
@@ -95,8 +95,8 @@ targets:
         TEST_TARGET_NAME: ICCery
         GENERATE_INFOPLIST_FILE: YES
         CODE_SIGN_IDENTITY: "-"
-        SWIFT_VERSION: "6.0"
-        MACOSX_DEPLOYMENT_TARGET: "14.0"
+        SWIFT_VERSION: "5.0"
+        MACOSX_DEPLOYMENT_TARGET: "12.0"
 
 schemes:
   ICCery: