diff --git a/test/screens/timer/bloc_timer_test.dart b/test/screens/timer/bloc_timer_test.dart
new file mode 100644
index 0000000..80c7349
--- /dev/null
+++ b/test/screens/timer/bloc_timer_test.dart
@@ -0,0 +1,66 @@
+import 'package:bloc_test/bloc_test.dart';
+import 'package:lightmeter/interactors/timer_interactor.dart';
+import 'package:lightmeter/screens/timer/bloc_timer.dart';
+import 'package:lightmeter/screens/timer/event_timer.dart';
+import 'package:lightmeter/screens/timer/state_timer.dart';
+import 'package:mocktail/mocktail.dart';
+import 'package:test/test.dart';
+
+class _MockTimerInteractor extends Mock implements TimerInteractor {}
+
+void main() {
+  late _MockTimerInteractor meteringInteractor;
+  late TimerBloc bloc;
+
+  setUp(() {
+    meteringInteractor = _MockTimerInteractor();
+    when(meteringInteractor.quickVibration).thenAnswer((_) async {});
+    when(meteringInteractor.responseVibration).thenAnswer((_) async {});
+
+    bloc = TimerBloc(meteringInteractor, const Duration(seconds: 1));
+  });
+
+  tearDown(() {
+    bloc.close();
+  });
+
+  blocTest<TimerBloc, TimerState>(
+    'Start -> wait till the end -> reset',
+    build: () => bloc,
+    act: (bloc) async {
+      bloc.add(const StartTimerEvent());
+      bloc.add(const TimerEndedEvent());
+      bloc.add(const ResetTimerEvent());
+    },
+    verify: (_) {
+      verify(() => meteringInteractor.quickVibration()).called(1);
+      verify(() => meteringInteractor.responseVibration()).called(1);
+    },
+    expect: () => [
+      isA<TimerResumedState>(),
+      isA<TimerStoppedState>(),
+      isA<TimerResetState>(),
+    ],
+  );
+
+  blocTest<TimerBloc, TimerState>(
+    'Start -> stop -> start -> wait till the end',
+    build: () => bloc,
+    act: (bloc) async {
+      bloc.add(const StartTimerEvent());
+      bloc.add(const StopTimerEvent());
+      bloc.add(const StartTimerEvent());
+      bloc.add(const TimerEndedEvent());
+    },
+    verify: (_) {
+      verify(() => meteringInteractor.quickVibration()).called(3);
+      verify(() => meteringInteractor.responseVibration()).called(1);
+    },
+    expect: () => [
+      isA<TimerResumedState>(),
+      isA<TimerStoppedState>(),
+      isA<TimerResumedState>(),
+      isA<TimerStoppedState>(),
+    ],
+  );
+}