Unit Test Generator

Unit Test Generator

Use this skill when asked to "write tests" or "test this feature".

1. Bloc Tests

Target: lib/features/<feature>/presentation/bloc/<feature>_bloc.dart Output: test/features/<feature>/presentation/bloc/<feature>_bloc_test.dart

Template:

import 'package:bloc_test/bloc_test.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:mockito/mockito.dart';
import 'package:mockito/annotations.dart';

// Generate mocks
@GenerateMocks([FeatureUseCase])
import 'feature_bloc_test.mocks.dart';

void main() {
  late FeatureBloc bloc;
  late MockFeatureUseCase mockUseCase;

  setUp(() {
    mockUseCase = MockFeatureUseCase();
    bloc = FeatureBloc(useCase: mockUseCase);
  });

  blocTest<FeatureBloc, FeatureState>(
    'emits [Loading, Loaded] when Event is added',
    build: () {
      when(mockUseCase.call(any)).thenAnswer((_) async => Right(data));
      return bloc;
    },
    act: (bloc) => bloc.add(const FeatureEvent.started()),
    expect: () => [
      const FeatureState.loading(),
      const FeatureState.loaded(data),
    ],
  );
}

2. Repository Tests

Target: lib/features/<feature>/data/repositories/<feature>_repository_impl.dart Output: test/features/<feature>/data/repositories/<feature>_repository_impl_test.dart

Strategy:

• Mock the RemoteDataSource.
• Verify that repository.getData() calls dataSource.getData().
• Test both Success and Failure (Exception) cases.

3. Post-Action

• Run dart run build_runner build --delete-conflicting-outputs to generate the mock files.

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