test(timer): add timer bloc tests

test/timer/bloc/timer_bloc_test.dart

@@ -0,0 +1,53 @@
+import 'package:bloc_test/bloc_test.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:kubrs_app/timer/bloc/timer_bloc.dart';
+
+void main() {
+  group('TimerBloc', () {
+    blocTest<TimerBloc, TimerState>(
+      'emits reset state when timer is reseted',
+      build: TimerBloc.new,
+      act: (bloc) => bloc.add(const ResetTimer()),
+      expect: () => const <TimerState>[TimerReseted()],
+    );
+
+    blocTest<TimerBloc, TimerState>(
+      'emits running state when timer is started',
+      setUp: WidgetsFlutterBinding.ensureInitialized,
+      build: TimerBloc.new,
+      seed: TimerReseted.new,
+      act: (bloc) => bloc.add(const StartTimer()),
+      expect: () => const <TimerState>[TimerRunning(Duration.zero)],
+    );
+
+    blocTest<TimerBloc, TimerState>(
+      'emits running states when timer ticks',
+      build: TimerBloc.new,
+      seed: () => const TimerRunning(Duration.zero),
+      act: (bloc) => bloc
+        ..add(const TickTimer(duration: Duration(seconds: 1)))
+        ..add(const TickTimer(duration: Duration(seconds: 2))),
+      expect: () => const <TimerState>[
+        TimerRunning(Duration(seconds: 1)),
+        TimerRunning(Duration(seconds: 2)),
+      ],
+    );
+
+    blocTest<TimerBloc, TimerState>(
+      'emits stop state when timer is stopped',
+      build: TimerBloc.new,
+      seed: () => const TimerRunning(Duration(seconds: 10)),
+      act: (bloc) => bloc.add(const StopTimer(duration: Duration(seconds: 10))),
+      expect: () => const <TimerState>[TimerStopped(Duration(seconds: 10))],
+    );
+
+    blocTest<TimerBloc, TimerState>(
+      'emits done state when timer is ended',
+      build: TimerBloc.new,
+      seed: () => const TimerStopped(Duration(seconds: 10)),
+      act: (bloc) => bloc.add(const EndTimer(duration: Duration(seconds: 10))),
+      expect: () => const <TimerState>[TimerDone(Duration(seconds: 10))],
+    );
+  });
+}