test/
└─ presentation/
   └─ ingredient/
      └─ ingredient_screen_test.dart

// test/domain/use_case/get_saved_recipes_use_case_test.dart
void main() {
  test('북마크된 id 집합에 해당하는 레시피만 스트림으로 흘러나온다', () async {
    final useCase = GetSavedRecipesUseCase(
      recipeRepository: FakeRecipeRepository(
        recipes: [Recipe(id: 1, /* ... */), Recipe(id: 2, /* ... */)],
      ),
      bookmarkRepository: FakeBookmarkRepository(initialIds: {2}),
    );

    final result = await useCase.execute().first;

    expect(result.map((e) => e.id), [2]);
  });
}

void main() {
  late FakeIngredientRepository ingredientRepo;
  late FakeProcedureRepository procedureRepo;
  late FakeGetDishesByCategoryUseCase getDishes;
  late FakeClipboardService clipboard;
  late IngredientViewModel viewModel;

  setUp(() {
    ingredientRepo = FakeIngredientRepository();
    procedureRepo = FakeProcedureRepository();
    getDishes = FakeGetDishesByCategoryUseCase();
    clipboard = FakeClipboardService();
    viewModel = IngredientViewModel(
      ingredientRepository: ingredientRepo,
      procedureRepository: procedureRepo,
      getDishesByCategoryUseCase: getDishes,
      clipboardService: clipboard,
    );
  });

  test('OnTapProcedure 를 받으면 선택 탭 인덱스가 1로 바뀐다', () {
    viewModel.onAction(const IngredientAction.onTapProcedure());
    expect(viewModel.state.selectedTabIndex, 1);
  });

  test('OnTapShareMenu 는 클립보드에 링크를 복사한다', () {
    viewModel.onAction(const IngredientAction.onTapShareMenu('https://example.com'));
    expect(clipboard.copiedTexts, ['https://example.com']);
  });
}

viewModel.onAction(const IngredientAction.loadRecipe(1));
await pumpEventQueue();
expect(viewModel.state.recipe, isNotNull);

int notifyCount = 0;
viewModel.addListener(() => notifyCount++);
viewModel.onAction(const IngredientAction.onTapIngredient());
expect(notifyCount, 1);

class FakeRecipeRepository implements RecipeRepository {
  FakeRecipeRepository({List<Recipe>? recipes}) : _recipes = recipes ?? [];
  final List<Recipe> _recipes;

  @override
  Future<List<Recipe>> getRecipes() async => _recipes;

  @override
  Future<Recipe?> getRecipe(int id) async =>
      _recipes.where((r) => r.id == id).firstOrNull;
}

class FakeBookmarkRepository implements BookmarkRepository {
  FakeBookmarkRepository({Set<int>? initialIds}) : _ids = {...?initialIds} {
    _controller.add(_ids);
  }
  final Set<int> _ids;
  final _controller = StreamController<Set<int>>.broadcast();

  @override
  Stream<Set<int>> bookmarkIdsStream() => _controller.stream;

  @override
  Future<void> toggle(int id) async {
    _ids.contains(id) ? _ids.remove(id) : _ids.add(id);
    _controller.add({..._ids});
  }
  // 나머지 메서드는 동일 패턴
}

void main() {
  testWidgets('레시피가 있으면 IngredientRecipeCard 가 표시된다', (tester) async {
    final state = IngredientState(
      recipe: Recipe(id: 1, name: 'Pizza', /* ... */),
      ingredients: const [],
      procedures: const [],
    );

    await tester.pumpWidget(
      MaterialApp(
        home: IngredientScreen(
          state: state,
          onAction: (_) {},
          onTapMenu: (_) {},
        ),
      ),
    );

    expect(find.text('Pizza'), findsOneWidget);
  });

  testWidgets('Procedure 탭을 누르면 onAction 으로 OnTapProcedure 가 전달된다', (tester) async {
    IngredientAction? captured;
    await tester.pumpWidget(
      MaterialApp(
        home: IngredientScreen(
          state: IngredientState(recipe: /* ... */),
          onAction: (a) => captured = a,
          onTapMenu: (_) {},
        ),
      ),
    );

    await tester.tap(find.text('Procedure'));
    expect(captured, isA<OnTapProcedure>());
  });
}

setUp(() {
  getIt.reset();
  getIt.registerFactory<IngredientViewModel>(() => FakeIngredientViewModel());
});

class IngredientRobot {
  IngredientRobot(this.tester);
  final WidgetTester tester;

  Future<IngredientRobot> pump(IngredientState state, {ValueChanged<IngredientAction>? onAction}) async {
    await tester.pumpWidget(MaterialApp(
      home: IngredientScreen(
        state: state,
        onAction: onAction ?? (_) {},
        onTapMenu: (_) {},
      ),
    ));
    return this;
  }

  Future<IngredientRobot> tapProcedureTab() async {
    await tester.tap(find.text('Procedure'));
    await tester.pump();
    return this;
  }

  IngredientRobot expectRecipeName(String name) {
    expect(find.text(name), findsOneWidget);
    return this;
  }
}

await IngredientRobot(tester)
    .pump(state)
    .then((r) => r.tapProcedureTab())
    .then((r) => r.expectRecipeName('Pizza'));