即使某些属性不相同，测试 bloc 状态也会通过

Question

这是 MyBloc 的 mapEventToState:

@override
  Stream<MyBlocState> mapEventToState(MyBlocEvent event) async* {
    if (event is MyBlocInitialize) {
      yield MyBlocStateInitialized(event.something);
    }

状态定义如下:

abstract class MyBlocState extends Equatable {
  EnterCredentialsState([List props = const []]) : super(props)
}

class MyBlocStateInitialized extends MyBlocState {
  final String _something;
  MyBlocStateInitialized(this._something);}

事件如下:

abstract class MyBlocEvent {}

class MyBlocEventInizialize extends MyBlocEvent{
  final string something;
  MyBlocEventInitialize(this.something);
}

现在，这是我的测试:

test('Should return MyBlocInitialized with a defined String', () {
    String _somethingString = 'Something';

expectLater(
_myBloc.state,emitsInOrder([
          MyBlocsStateUninitialized(),
          MyBlocStateInitialized(_somethingString)
        ]));

    _myBloc.dispatch(MyBlocEventInitialize(_somethingString);
}

此测试的问题在于它只会检查 bloc 是否会产生 MyBlocsStateUninitialized 和 MyBlocStateInitialized，但不会检查 MyBlocStateInitialized< 中的字符串。其实我也可以改变

expectLater(
_myBloc.state,emitsInOrder([
          MyBlocsStateUninitialized(),
          MyBlocInitialized('WRONG')
        ]));

    _myBloc.dispatch(MyBlocEventInitialize(_somethingString);
}

它仍然会过去。

Answer 1

每次你在状态上有一个可比较的参数时，你必须将它传递给父构造函数 - Equatable - 就像你对 MyBlocState 所做的那样，否则它将被初始化使用空列表，比较时您将收到误报。

来自 Equatable

The constructor takes an optional [List] of props (properties) which will be used to determine whether two [Equatables] are equal. If no properties are provided, props will be initialized to an empty [List].

abstract class MyBlocState extends Equatable {
  EnterCredentialsState([List props = const []]) : super(props)
}

class MyBlocStateInitialized extends MyBlocState {
  MyBlocStateInitialized(this._something): super([_something]);
  final String _something;
}