问题描述
我正在尝试学习rx大理石进行单元测试。我在测试subscribe块内的behaviorsubject的值时遇到问题。主题车也有问题。
private readonly caRSSubject = new Subject();
readonly cars$ = this.caRSSubject.asObservable();
private readonly carsLoadingSubject = new BehaviorSubject<boolean>(false);
readonly carsLoading$ = this.carsLoadingSubject.asObservable();
constructor(private carsBackendService: CarsBackendService) { }
public loadCars(carsPayload: Car): void {
this.carsLoadingSubject.next(true);
this.carsBackendService.getCars(carsPayload)
.subscribe(
cars => {
this.caRSSubject.next(cars);
this.carsLoadingSubject.next(false);
},err => {
console.log('Error while getting cars',err);
this.carsLoadingSubject.next(false);
}
);
}
我为此代码块编写了以下测试:
it('should carsLoading$ return true when loadCars started and false after loded',() => {
scheduler.run(({ expectObservable,flush }) => {
service.loadCars(mockCarPayload);
flush();
expectObservable(service.carsLoading$).toBe('a-b-c',{a: false,b: true,c: false });
});
});
问题是我收到错误消息,即carsLoading $发出的项目的预期长度应为1,但我希望为3,且值始终为false。我应该如何测试?
解决方法
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