Unit testing 如何在颤振中测试密封状态类？

我在我的Flitter应用程序中使用冻结来生成密封的数据类。我需要测试它，我不知道怎么做。有什么想法吗？这是国家：

@freezed
abstract class LoginState with _$LoginState {
  const factory LoginState({
    @required Email email,
    @required Password password,
    @required bool isLoading,
    @required bool showErrors,
    @required Option<Either<AuthFailure, Unit>> failureOrSuccessOption,
  }) = _LoginState;

  factory LoginState.initial() => LoginState(
        failureOrSuccessOption: none(),
        isLoading: false,
        showErrors: false,
        email: Email(''),
        password: Password(''),
      );
}

我想检查在执行cubit loginMethod时，它是否正确地将加载状态更改为true（在获得结果时），将加载状态更改为false（在获得结果后），但我收到以下错误消息：

Expected: should do the following in order:
          * emit an event that _$_LoginState:<LoginState(email: Value(Left(EmailFailure.empty())), password: Value(Left(PasswordFailure.empty())), isLoading: true, showErrors: false, failureOrSuccessOption: None)>
          * emit an event that _$_LoginState:<LoginState(email: Value(Left(EmailFailure.empty())), password: Value(Left(PasswordFailure.empty())), isLoading: false, showErrors: false, failureOrSuccessOption: None)>
  Actual: _$_LoginState:<LoginState(email: Value(Left(EmailFailure.empty())), password: Value(Left(PasswordFailure.empty())), isLoading: false, showErrors: false, failureOrSuccessOption: None)>
   Which: was not a Stream or a StreamQueue

Expected:应按顺序执行以下操作：
*发出一个$\u LoginState的事件：
*发出一个$\u LoginState的事件：
实际：$\u登录状态：
Which：不是流或流队列

Expected: should do the following in order:
          * emit an event that _$_LoginState:<LoginState(email: Value(Left(EmailFailure.empty())), password: Value(Left(PasswordFailure.empty())), isLoading: true, showErrors: false, failureOrSuccessOption: None)>
          * emit an event that _$_LoginState:<LoginState(email: Value(Left(EmailFailure.empty())), password: Value(Left(PasswordFailure.empty())), isLoading: false, showErrors: false, failureOrSuccessOption: None)>
  Actual: _$_LoginState:<LoginState(email: Value(Left(EmailFailure.empty())), password: Value(Left(PasswordFailure.empty())), isLoading: false, showErrors: false, failureOrSuccessOption: None)>
   Which: was not a Stream or a StreamQueue