我有一個Angular 2服務的方法,它獲取特定用戶帳戶的所有詳細信息 - 登錄的帳戶 - 並返回一個Observable。Angular 2 Observable and Promise回調單元測試
(我使用AngularFire2進行身份驗證,爲它的價值)
正如你所看到的,getData
方法是使用getAuth
方法,該方法返回認證狀態(如可觀察到的),這反過來又由getToken
方法(它返回一個Promise)使用來獲取用於填充Authorization
標頭並執行http請求的令牌。 (我也明白,我的代碼可能需要重構,我將不勝感激任何意見)
getData(): Observable<IData> {
let authHeaders = new Headers();
return Observable.create((o: Observer<IData>) => {
this.getAuth().subscribe((authState: IState) => {
this.getToken(authState).then(token => {
/* ...
* Do things with that token, call an http service etc.
*/ ...
authHeaders.set('Authorization', token);
this.http.get('myendpoint/', {
headers: this.authHeaders
})
.map((response: Response) => response.json())
.map((data: IData) => {
o.next(data);
});
})
.catch((error: Error) => {
Observable.throw(new Error(`Error: ${error}`));
});
});
});
}
我是新來的單元測試,並已試圖測試這種方法,但我仍然不能掩蓋該方法中的Promise的.catch
。
這裏是我的單元測試的樣子:
describe('Service: UserDataService',() => {
let mockHttp: Http;
let service: UserDataService;
let getAuthSpy: jasmine.Spy;
let getTokenSpy: jasmine.Spy;
beforeEach(() => {
mockHttp = { get: null } as Http;
TestBed.configureTestingModule({
providers: [
{ provide: Http, useValue: mockHttp },
AngularFire,
UserDataService,
]
});
service = new UserDataService(AngularFire, mockHttp);
spyOn(mockHttp, 'get').and.returnValue(Observable.of({
json:() => {
"nickname": "MockNickname"
}
}));
getAuthSpy = spyOn(service, 'getAuth').and.returnValue(Observable.of({
"auth": {
"uid": "12345"
}));
getTokenSpy = spyOn(service, 'getToken').and.returnValue(new Promise((resolve, reject) => {
resolve('test promise response');
}));
});
describe('getLead',() => {
beforeEach(() => {
spyOn(service, 'getLead').and.callThrough();
});
it('should return an object of user data and set the dataStore.userEmail if state exists',() => {
service.getLead().subscribe(res => {
expect(res).toEqual(jasmine.objectContaining({
nickname: 'MockNickname'
}));
});
expect(service.getLead).toHaveBeenCalled();
});
it('should throw, if no authState is provided',() => {
getAuthSpy.and.returnValue(Observable.of(false));
service.getLead();
expect(service.getLead).toThrow();
});
it('should throw, if getToken() fails to return a token',() => {
getTokenSpy.and.returnValue(new Promise((resolve, reject) => {
reject('test error response');
}));
/*
* This is where I am getting lost
*/
service.getLead();
expect(service.getLead).toThrow();
});
});
});
從我明白我必須以某種方式作出這樣的承諾,從getToken
拒絕,並測試,看看我觀察到會拋出。
任何幫助或反饋非常感謝。
'spyOn(...)。and.returnValue(Observable.throw(...)。toPromise())'?你可以用'Observable.map'使這個更加線性化,逐步執行,而不是增加嵌套,根據需要轉換'fromPromise'和'toPromise'。 – jonrsharpe