loadAdList$
是一个 Observable,它利用了actions$
stream:
loadAdList$: Observable<Action> = this.actions$
.ofType<adActions.Load>(adActions.LOAD)
.switchMap((action) => {
return Observable.fromPromise(store.findAll('ad', action.payload)
.then((ads) => {
return new adActions.LoadSuccess(ads);
})
.catch((err) => {
return new adActions.LoadFail(err);
}));
});
在浏览器中运行,没有任何问题。但是,我也想对其进行单元测试:
actions$ = hot('-a', { a: loadAction });
const storeResponse = Promise.resolve(mockAds);
const expected$ = cold('-c', { c: loadSuccessAction });
spyOn(store, 'findAll').and.returnValue(storeResponse);
expect(effects.loadAdList$).toBeObservable(expected$);
测试失败并显示以下内容:
Expected
to deep equal
{"frame":10,"notification":{"kind":"N","value":{"payload":"[
...
我相信这个问题与store.findAll
返回承诺的方法。这是基于以下测试的结果:
.switchMap((action) => {
// This test will pass
return Observable.from([new adActions.LoadSuccess(mockAds)]);
// This test will fail
return Observable.fromPromise(Promise.resolve(new adActions.LoadSuccess(mockAds)));
});