ReddRadar
Agent skill
flutter-testing
Flutter testing patterns with mocktail. Covers unit testing, widget testing, and BLoC/Cubit testing. Use when writing tests or setting up test infrastructure.
Install this agent skill to your Project
npx add-skill https://github.com/abhishekbrt/GlowState/tree/main/.opencode/skill/testing
SKILL.md
Flutter Testing
Test Commands
flutter test # Run all tests
flutter test test/features/auth/ # Run feature tests
flutter test --plain-name "returns empty" # Run by name pattern
flutter test --coverage # With coverage
Detailed Guides
| Topic | Guide | Use When |
|---|---|---|
| Unit Testing | unit-testing.md | Testing business logic, repositories, use cases |
| Widget Testing | widget-testing.md | Testing UI components, interactions |
| BLoC Testing | bloc-testing.md | Testing BLoC/Cubit state management |
Feature-First Test Structure
test/
├── features/
│ ├── auth/
│ │ ├── data/
│ │ │ ├── auth_repository_test.dart
│ │ │ └── auth_remote_source_test.dart
│ │ ├── domain/
│ │ │ └── login_usecase_test.dart
│ │ └── presentation/
│ │ ├── login_screen_test.dart
│ │ └── auth_bloc_test.dart
│ ├── home/
│ │ ├── data/
│ │ ├── domain/
│ │ └── presentation/
│ └── profile/
│ └── ...
├── core/
│ ├── network/
│ │ └── api_client_test.dart
│ └── utils/
│ └── validators_test.dart
└── helpers/
├── pump_app.dart # Test wrapper with providers
├── mocks.dart # Shared mock classes
└── fixtures.dart # Test data factories
Mocking with Mocktail
import 'package:mocktail/mocktail.dart';
class MockAuthRepository extends Mock implements AuthRepository {}
void main() {
late MockAuthRepository mockRepo;
setUp(() {
mockRepo = MockAuthRepository();
});
test('returns user on successful login', () async {
// Arrange
when(() => mockRepo.login(any(), any()))
.thenAnswer((_) async => User(id: '1', name: 'Test'));
// Act
final result = await mockRepo.login('email', 'pass');
// Assert
expect(result.name, equals('Test'));
verify(() => mockRepo.login('email', 'pass')).called(1);
});
}
Fakes vs Mocks
| Type | Use When | Example |
|---|---|---|
| Mock | Verify interactions | verify(() => mock.save(any())).called(1) |
| Fake | Need working implementation | FakeAuthRepo with in-memory Map |
| Stub | Fixed return values | when(() => mock.get()).thenReturn(value) |
Dependencies
dev_dependencies:
flutter_test:
sdk: flutter
mocktail: ^1.0.0
bloc_test: ^9.1.0 # If using BLoC
Test Naming
// ✅ Describe behavior
test('returns empty list when no todos exist', () {});
test('throws AuthException when credentials invalid', () {});
// ❌ Don't describe implementation
test('test getTodos', () {});
test('login test', () {});
Arrange-Act-Assert
test('adds item to cart', () {
// Arrange
final cart = Cart();
final item = Item(id: '1', price: 10.0);
// Act
cart.add(item);
// Assert
expect(cart.items, contains(item));
expect(cart.total, equals(10.0));
});
Group Related Tests
group('LoginUseCase', () {
group('when credentials valid', () {
test('returns user', () {});
test('caches auth token', () {});
});
group('when credentials invalid', () {
test('throws AuthException', () {});
test('does not cache token', () {});
});
});
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