FlutterBloc單元測驗回傳一個空陣列

我正在嘗試使用 bloc_test 庫進行單元測驗。

這是我的代碼。

登錄手肘

class LoginCubit extends Cubit<LoginState> with HydratedMixin {
  final UserRepository _userRepository;
  LoginCubit(this._userRepository) : super(LoginInitial());

  Future<void> login (String email, String password , bool remember) async {
    bool result = await _userRepository.isLoginCorrectWithEmailAndPassword(email, password);
    if (result){
      emit(LoggedIn(remember: remember, email: email));
    } else {
      emit(LoginError());
    }
  }
}

登錄狀態

part of 'login_cubit.dart';

@immutable
abstract class LoginState extends Equatable {}

class LoginInitial extends LoginState {
  final bool remember;
  final String email;
  LoginInitial({this.remember = false, this.email = ''});

  @override
  List<Object?> get props => [remember, email];
}

class LoggedIn extends LoginState {
  final bool remember;
  final String email;
  LoggedIn({required this.remember, required this.email});

  @override
  List<Object?> get props => [remember, email];
}

class LoginError extends LoginState {
  LoginError();

  @override
  List<Object?> get props => [];
}

單元測驗

class MockUserRepository extends Mock implements UserRepository {
  @override
  Future<bool> isLoginCorrectWithEmailAndPassword(String email, String password) {
    return Future.value(true);
  }
}

void main() {
  group('LoginCubit', () {
    late LoginCubit loginCubit;

    setUp(() {
      loginCubit = LoginCubit(MockUserRepository());
    });

    tearDown(() {
      loginCubit.close();
    });

    test('the initial state value is LoginInitial', () {
      expect(loginCubit.state, LoginInitial());
    });

    blocTest<LoginCubit, LoginState>(
      'TODO: description',
      build: () => loginCubit,
      act: (cubit) => cubit.login("any email", "any password", true),
      expect: () => <LoginState>[
        LoggedIn(remember: true, email: "any email"),
      ],
    );
  });
}

我的問題是第二個測驗總是回傳一個空陣列。通過一些列印，我確定代碼發出 LoggedIn 狀態，但測驗實際上無法識別它。

我在哪里做錯了？:)

uj5u.com熱心網友回復：

您忘記為存盤庫函式呼叫添加存根。

1. 從 Mock 類創建一個物件 MockUserRepository repo = MockUserRepository();

2. 像這樣LoginCubit將這個物件傳遞給setUp函式中的

   setUp(() { loginCubit = LoginCubit(repo); });

3. 將此行添加到act測驗中的函式

       when(repo.isLoginCorrectWithEmailAndPassword(any, any)).thenAnswer((_) async => true);
   

所以整個測驗應該是這樣的

blocTest<LoginCubit, LoginState>(
  'TODO: description',
  build: () => loginCubit,
  act: (cubit) {
      when(repo.isLoginCorrectWithEmailAndPassword(any, any)).thenAnswer((_) async => true);
      cubit.login("any email", "any password", true);
  },
  expect: () => <LoginState>[
    LoggedIn(remember: true, email: "any email"),
  ],
);

uj5u.com熱心網友回復：

問題是我使用的是 Hydrated Bloc 而沒有在測驗中對其進行初始化。這是它的解決方案：https : //github.com/felangel/bloc/issues/2022#issuecomment-747918417

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