我有一个Angular 2服务的方法,它获取特定用户帐户的所有详细信息 - 登录的帐户 - 并返回一个Observable。Angular 2 Observable and Promise回调单元测试
(我使用AngularFire2进行身份验证,为它的价值)
正如你所看到的,getData
方法是使用getAuth
方法,该方法返回认证状态(如可观察到的),这反过来又由getToken
方法(它返回一个Promise)使用来获取用于填充Authorization
标头并执行http请求的令牌。 (我也明白,我的代码可能需要重构,我将不胜感激任何意见)
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}`));
});
});
});
}
我是新来的单元测试,并已试图测试这种方法,但我仍然不能掩盖该方法中的Promise的.catch
。
这里是我的单元测试的样子:
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();
});
});
});
从我明白我必须以某种方式作出这样的承诺,从getToken
拒绝,并测试,看看我观察到会抛出。
任何帮助或反馈非常感谢。
'spyOn(...)。and.returnValue(Observable.throw(...)。toPromise())'?你可以用'Observable.map'使这个更加线性化,逐步执行,而不是增加嵌套,根据需要转换'fromPromise'和'toPromise'。 – jonrsharpe