unit-test-generator

name	Unit Test Generator
description	Generates unit tests for Clean Architecture components using Mockito and BlocTest.

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.