Source Code added

mobile/test/modules/utils/debouncer_test.dart

@@ -0,0 +1,41 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/utils/debounce.dart';
+
+class _Counter {
+  int _count = 0;
+  _Counter();
+
+  int get count => _count;
+  void increment() => _count = _count + 1;
+}
+
+void main() {
+  test('Executes the method after the interval', () async {
+    var counter = _Counter();
+    final debouncer = Debouncer(interval: const Duration(milliseconds: 300));
+    debouncer.run(() => counter.increment());
+    expect(counter.count, 0);
+    await Future.delayed(const Duration(milliseconds: 300));
+    expect(counter.count, 1);
+  });
+
+  test('Executes the method immediately if zero interval', () async {
+    var counter = _Counter();
+    final debouncer = Debouncer(interval: const Duration(milliseconds: 0));
+    debouncer.run(() => counter.increment());
+    // Even though it is supposed to be executed immediately, it is added to the async queue and so
+    // we need this delay to make sure the actual debounced method is called
+    await Future.delayed(const Duration(milliseconds: 0));
+    expect(counter.count, 1);
+  });
+
+  test('Delayes method execution after all the calls are completed', () async {
+    var counter = _Counter();
+    final debouncer = Debouncer(interval: const Duration(milliseconds: 100));
+    debouncer.run(() => counter.increment());
+    debouncer.run(() => counter.increment());
+    debouncer.run(() => counter.increment());
+    await Future.delayed(const Duration(milliseconds: 300));
+    expect(counter.count, 1);
+  });
+}