mogen_unit_tests 1.0.4

Scans Riverpod AsyncNotifier classes and auto-generates Mocktail unit tests.

example/example.dart

// ignore_for_file: avoid_print

/// This file demonstrates how mogen_unit_tests works end-to-end.
///
/// Given the following feature structure in your Flutter project:
///
/// ```
/// lib/
/// └── features/
///     └── cart/
///         └── presentation/
///             ├── notifiers/
///             │   └── cart_notifier.dart
///             └── states/
///                 └── cart_state.dart
/// ```
///
/// Running `dart run mogen_unit_tests` from your project root generates:
///
/// ```
/// test/
/// └── unit/
///     └── features/
///         └── cart/
///             └── cart_notifier_test.dart
///
/// ```
///
/// ---
///
/// ## Example input — cart_notifier.dart
///
/// ```dart
/// import 'package:riverpod_annotation/riverpod_annotation.dart';
/// import '../../states/cart_state.dart';
/// import '../../../data/repositories/cart_repository_impl.dart';
///
/// part 'cart_notifier.g.dart';
///
/// @riverpod
/// class CartNotifier extends _$CartNotifier {
///   @override
///   Future<CartState> build() async {
///     final repo = ref.read(cartRepositoryProvider);
///     return repo.fetchCart();
///   }
///
///   Future<void> addItem(CartItem item) async {
///     final repo = ref.read(cartRepositoryProvider);
///     await repo.addItem(item);
///     ref.invalidateSelf();
///   }
///
///   Future<void> removeItem(String itemId) async {
///     final repo = ref.read(cartRepositoryProvider);
///     await repo.removeItem(itemId);
///     ref.invalidateSelf();
///   }
/// }
/// ```
///
/// ## Example output — cart_notifier_test.dart
///
/// ```dart
/// // GENERATED BY mogen_unit_tests — DO NOT EDIT
/// // ignore_for_file: lines_longer_than_80_chars
///
/// import 'package:flutter_riverpod/flutter_riverpod.dart';
/// import 'package:flutter_test/flutter_test.dart';
/// import 'package:mocktail/mocktail.dart';
///
/// import 'package:my_app/features/cart/presentation/notifiers/cart_notifier.dart';
/// import 'package:my_app/features/cart/presentation/states/cart_state.dart';
/// import 'package:my_app/features/cart/data/repositories/cart_repository_impl.dart';
///
/// // ── Mocks ────────────────────────────────────────────────────────────────
/// class MockCartRepository extends Mock implements CartRepository {}
///
/// // ── Fakes (registerFallbackValue) ────────────────────────────────────────
/// class FakeCartItem extends Fake implements CartItem {}
///
/// void main() {
///   group('CartNotifier', () {
///     late MockCartRepository mockCartRepository;
///     late ProviderContainer container;
///
///     setUpAll(() {
///       registerFallbackValue(FakeCartItem());
///     });
///
///     setUp(() {
///       mockCartRepository = MockCartRepository();
///       container = ProviderContainer(
///         overrides: [
///           cartRepositoryProvider.overrideWithValue(mockCartRepository),
///         ],
///       );
///     });
///
///     tearDown(() {
///       container.dispose();
///     });
///
///     // ── build() ──────────────────────────────────────────────────────────
///     group('build', () {
///       test('returns CartState successfully', () async {
///         // Arrange: stub repositories
///         // when(() => mockCartRepository.fetchCart())
///         //     .thenAnswer((_) async => CartState(items: [], total: 0.0));
///
///         final result = await container.read(cartNotifierProvider.future);
///
///         expect(result, isA<CartState>());
///       });
///
///       test('emits error when repository throws', () async {
///         // when(() => mockCartRepository.fetchCart())
///         //     .thenThrow(Exception('test error'));
///
///         await container
///             .read(cartNotifierProvider.future)
///             .catchError((_) {});
///
///         expect(container.read(cartNotifierProvider), isA<AsyncError>());
///       });
///     });
///
///     // ── addItem() ────────────────────────────────────────────────────────
///     group('addItem', () {
///       test('addItem completes successfully', () async {
///         final item = FakeCartItem();
///
///         await container.read(cartNotifierProvider.future);
///         await container.read(cartNotifierProvider.notifier).addItem(item);
///
///         // verify(() => mockCartRepository.addItem(any())).called(1);
///       });
///
///       test('addItem handles error from repository', () async {
///         // when(() => mockCartRepository.addItem(any()))
///         //     .thenThrow(Exception('test error'));
///         final item = FakeCartItem();
///
///         await container.read(cartNotifierProvider.future).catchError((_) {});
///
///         expect(
///           () async => container
///               .read(cartNotifierProvider.notifier)
///               .addItem(item),
///           throwsA(isA<Exception>()),
///         );
///       });
///     });
///
///     // ── removeItem() ─────────────────────────────────────────────────────
///     group('removeItem', () {
///       test('removeItem completes successfully', () async {
///         final itemId = '';
///
///         await container.read(cartNotifierProvider.future);
///         await container
///             .read(cartNotifierProvider.notifier)
///             .removeItem(itemId);
///       });
///
///       test('removeItem handles error from repository', () async {
///         final itemId = '';
///
///         await container.read(cartNotifierProvider.future).catchError((_) {});
///
///         expect(
///           () async => container
///               .read(cartNotifierProvider.notifier)
///               .removeItem(itemId),
///           throwsA(isA<Exception>()),
///         );
///       });
///     });
///   });
/// }
/// ```
library;

// After installing, run from your Flutter project root:
//
//   dart run mogen_unit_tests
//
// Options:
//   --dry-run    Preview output without writing files
//   --verbose    Print detailed progress
//   --root       Path to project root (defaults to current directory)

void main() {
  print('Run `dart run mogen_unit_tests` from your Flutter project root.');
}