Angular：无法设置模拟 HTTP 响应的内容

Question

我有这个代码：

  /**
   * Attempt login with provided credentials
   * @returns {Observable<number>} the status code of HTTP response
   */
  login(username: string, password: string): Observable<number> {
    let body = new URLSearchParams();
    body.append('grant_type', 'password');
    body.append('username', username);
    body.append('password', password);

    let connObservable = this.http.post(Constants.LOGIN_URL, body, null)
      .map(res => {
        if (res.status == 200) {
          log(res.json());
        }
        return res.status;
      })
      .catch(err => { return Observable.throw(err.status) })
      .publish();

    // this ensures that side effects will be present regardless os whether
    // the client subscribes to the returned Observable
    connObservable.connect();

    // no need for the client to know that we use ConnectableObservable internally
    return connObservable as Observable<number>;
  }

我想用这段代码对它进行单元测试：

describe('AuthenticationService', () => {

  let sut: AuthenticationService;
  let authTokeServiceStub: AuthTokenServiceStub;
  let mockBackend: MockBackend;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [ HttpModule ],
      providers: [
        AuthenticationService,
        {provide: XHRBackend, useClass: MockBackend},
        {provide: AuthTokenService, useClass: AuthTokenServiceStub}
      ]
    });

    sut = TestBed.get(AuthenticationService);
    authTokeServiceStub = TestBed.get(AuthTokenService);
    mockBackend = TestBed.get(XHRBackend);
  });


  describe('login()', () => {

    it('should store retrieved access token on successful response', () => {
      mockBackend.connections.subscribe(connection => {
        let options = new ResponseOptions();
        options.body = JSON.stringify({access_token : 'accessToken'});
        options.status = 200;
        connection.mockRespond(new Response(options));
      });
      spyOn(authTokeServiceStub, 'setAuthToken');
      sut.login('username', 'password');
      expect(authTokeServiceStub.setAuthToken).toHaveBeenCalledWith('accessToken');
    });

  });

});

问题是log(res.json()) 总是产生空对象：{}。

为了隔离问题，我尝试将模拟响应的状态更改为 400，但没有任何效果。 Response 对象的 options 参数似乎被忽略了。

我尝试将测试包装在 async 中，然后在 fakeAsync 中并在阶段之间添加 tick() 和 tick(50)，但它也不起作用。 我做错了什么？

Answer 1

您需要更新您对

的回复

new Response(new ResponseOptions(response))