Add dummy Log implementation to be used in tests

Log methods are static, so they can not be mocked using Mockito.
Although it might be possible to use PowerMockito a dummy implementation
was added instead, as Log uses are widespread and it is not something
worth mocking anyway.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

app/src/test/java/android/util/Log.java

@@ -0,0 +1,51 @@
+/*
+ * Nextcloud Talk - Android Client
+ *
+ * SPDX-FileCopyrightText: 2024 Daniel Calviño Sánchez <danxuliu@gmail.com>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+package android.util;
+
+/**
+ * Dummy implementation of android.util.Log to be used in unit tests.
+ * <p>
+ * The Android Gradle plugin provides a library with the APIs of the Android framework that throws an exception if any
+ * of them are called. This class is loaded before that library and therefore becomes the implementation used during the
+ * tests, simply printing the messages to the system console.
+ */
+public class Log {
+
+    public static int d(String tag, String msg) {
+        System.out.println("DEBUG: " + tag + ": " + msg);
+
+        return 1;
+    }
+
+    public static int e(String tag, String msg) {
+        System.out.println("ERROR: " + tag + ": " + msg);
+
+        return 1;
+    }
+
+    public static int i(String tag, String msg) {
+        System.out.println("INFO: " + tag + ": " + msg);
+
+        return 1;
+    }
+
+    public static boolean isLoggable(String tag, int level) {
+        return true;
+    }
+
+    public static int v(String tag, String msg) {
+        System.out.println("VERBOSE: " + tag + ": " + msg);
+
+        return 1;
+    }
+
+    public static int w(String tag, String msg) {
+        System.out.println("WARN: " + tag + ": " + msg);
+
+        return 1;
+    }
+}