我有一个Dart类,它侦听从StreamController发出的流:
_buttonsUnfoldedSubscription = _messagesListBloc.stream.listen((data) {
if (data.messageId != _message.id) {
_state = MessageState.QUESTION;
notifyListeners();
}
});
我尝试为侦听器中的代码创建一个单元测试:
test('should set state to ${MessageState.QUESTION}',() {
bloc.state = MessageState.OPTIONS;
controller.sink.add(MessageButtonsUnfolded("another_id"));
expectLater(bloc.state,MessageState.QUESTION);
});
问题在于sink.add()事件稍后以异步方式到达。
我如何等待流传递消息以执行测试断言?