Added hotkey manager test

test/services/hotkey_manager_test.dart

@@ -0,0 +1,72 @@
+import 'package:flutter/services.dart';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/mockito.dart';
+
+import 'package:elastic_dashboard/services/hotkey_manager.dart';
+
+class MockShortcutCallback extends Mock {
+  void callback();
+}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  tearDown(() {
+    hotKeyManager.tearDown();
+    HardwareKeyboard.instance.clearState();
+  });
+
+  test('Shortcut no modifiers', () async {
+    MockShortcutCallback mockCallback = MockShortcutCallback();
+
+    hotKeyManager.register(
+      HotKey(LogicalKeyboardKey.keyA),
+      callback: mockCallback.callback,
+    );
+
+    await simulateKeyDownEvent(LogicalKeyboardKey.keyA);
+
+    verifyNever(mockCallback.callback());
+
+    await simulateKeyUpEvent(LogicalKeyboardKey.keyA);
+
+    verify(mockCallback.callback()).called(1);
+
+    await simulateKeyDownEvent(LogicalKeyboardKey.control);
+
+    await simulateKeyDownEvent(LogicalKeyboardKey.keyA);
+    await simulateKeyUpEvent(LogicalKeyboardKey.keyA);
+
+    verify(mockCallback.callback()).called(1);
+  });
+
+  test('Shortcut with modifiers', () async {
+    MockShortcutCallback mockCallback = MockShortcutCallback();
+
+    hotKeyManager.register(
+      HotKey(
+        LogicalKeyboardKey.keyA,
+        modifiers: [KeyModifier.control, KeyModifier.shift, KeyModifier.alt],
+      ),
+      callback: mockCallback.callback,
+    );
+
+    await simulateKeyDownEvent(LogicalKeyboardKey.keyA);
+
+    verifyNever(mockCallback.callback());
+
+    await simulateKeyUpEvent(LogicalKeyboardKey.keyA);
+
+    verifyNever(mockCallback.callback());
+
+    await simulateKeyDownEvent(LogicalKeyboardKey.control);
+    await simulateKeyDownEvent(LogicalKeyboardKey.shift);
+    await simulateKeyDownEvent(LogicalKeyboardKey.alt);
+
+    await simulateKeyDownEvent(LogicalKeyboardKey.keyA);
+    await simulateKeyUpEvent(LogicalKeyboardKey.keyA);
+
+    verify(mockCallback.callback()).called(1);
+  });
+}