fix: convert all test files from jest to vitest and fix QBittorrentClient import

- Convert RTorrentClient.test.js to use vi.mock() instead of jest.mock()
- Convert QBittorrentClient.test.js to use vi.mock() instead of jest.mock()
- Convert SABnzbdClient.test.js to use vi.mock() instead of jest.mock()
- Convert TransmissionClient.test.js to use vi.mock() instead of jest.mock()
- Convert downloadClients.test.js to use vi.mock() instead of jest.mock()
- Convert integration/downloadClients.test.js to use vi.mock() instead of jest.mock()
- Fix legacy qbittorrent.test.js to import QBittorrentClient from new location
- Add getRtorrentInstances mock to downloadClients.test.js
- Add RTORRENT_INSTANCES to integration test environment variables

tests/unit/downloadClients.test.js

@@ -1,6 +1,6 @@
 // Copyright (c) 2026 Gordon Bolton. MIT License.
-const { 
-  DownloadClientRegistry, 
+const {
+  DownloadClientRegistry,
   registry,
   initializeClients,
   getAllClients,
@@ -11,55 +11,57 @@ const {
   testAllConnections,
   getAllClientStatuses
 } = require('../../server/utils/downloadClients');
+const { vi } = require('vitest');
 
 // Mock config and clients
-jest.mock('../../server/utils/config', () => ({
-  getSABnzbdInstances: jest.fn(),
-  getQbittorrentInstances: jest.fn(),
-  getTransmissionInstances: jest.fn()
+vi.mock('../../server/utils/config', () => ({
+  getSABnzbdInstances: vi.fn(),
+  getQbittorrentInstances: vi.fn(),
+  getTransmissionInstances: vi.fn(),
+  getRtorrentInstances: vi.fn()
 }));
 
-jest.mock('../../server/utils/logger', () => ({
-  logToFile: jest.fn()
+vi.mock('../../server/utils/logger', () => ({
+  logToFile: vi.fn()
 }));
 
-jest.mock('../../server/clients/SABnzbdClient', () => {
-  return jest.fn().mockImplementation((config) => ({
+vi.mock('../../server/clients/SABnzbdClient', () => {
+  return vi.fn().mockImplementation((config) => ({
     getClientType: () => 'sabnzbd',
     getInstanceId: () => config.id,
     name: config.name,
-    getActiveDownloads: jest.fn().mockResolvedValue([
+    getActiveDownloads: vi.fn().mockResolvedValue([
       { id: 'sab1', title: 'SAB Download 1', client: 'sabnzbd' }
     ]),
-    testConnection: jest.fn().mockResolvedValue(true),
-    getClientStatus: jest.fn().mockResolvedValue({ status: 'active' })
+    testConnection: vi.fn().mockResolvedValue(true),
+    getClientStatus: vi.fn().mockResolvedValue({ status: 'active' })
   }));
 });
 
-jest.mock('../../server/clients/QBittorrentClient', () => {
-  return jest.fn().mockImplementation((config) => ({
+vi.mock('../../server/clients/QBittorrentClient', () => {
+  return vi.fn().mockImplementation((config) => ({
     getClientType: () => 'qbittorrent',
     getInstanceId: () => config.id,
     name: config.name,
-    getActiveDownloads: jest.fn().mockResolvedValue([
+    getActiveDownloads: vi.fn().mockResolvedValue([
       { id: 'qb1', title: 'QB Download 1', client: 'qbittorrent' }
     ]),
-    testConnection: jest.fn().mockResolvedValue(true),
-    getClientStatus: jest.fn().mockResolvedValue({ status: 'active' }),
-    resetFallbackFlag: jest.fn()
+    testConnection: vi.fn().mockResolvedValue(true),
+    getClientStatus: vi.fn().mockResolvedValue({ status: 'active' }),
+    resetFallbackFlag: vi.fn()
   }));
 });
 
-jest.mock('../../server/clients/TransmissionClient', () => {
-  return jest.fn().mockImplementation((config) => ({
+vi.mock('../../server/clients/TransmissionClient', () => {
+  return vi.fn().mockImplementation((config) => ({
     getClientType: () => 'transmission',
     getInstanceId: () => config.id,
     name: config.name,
-    getActiveDownloads: jest.fn().mockResolvedValue([
+    getActiveDownloads: vi.fn().mockResolvedValue([
       { id: 'trans1', title: 'Trans Download 1', client: 'transmission' }
     ]),
-    testConnection: jest.fn().mockResolvedValue(true),
-    getClientStatus: jest.fn().mockResolvedValue({ status: 'active' })
+    testConnection: vi.fn().mockResolvedValue(true),
+    getClientStatus: vi.fn().mockResolvedValue({ status: 'active' })
   }));
 });
 
@@ -69,7 +71,7 @@ describe('DownloadClientRegistry', () => {
 
   beforeEach(() => {
     testRegistry = new DownloadClientRegistry();
-    jest.clearAllMocks();
+    vi.clearAllMocks();
   });
 
   describe('Initialization', () => {
@@ -291,7 +293,7 @@ describe('DownloadClientRegistry', () => {
 
 describe('Convenience Functions', () => {
   beforeEach(() => {
-    jest.clearAllMocks();
+    vi.clearAllMocks();
   });
 
   it('should delegate to singleton registry', async () => {