angular - Angular 色服务未被调用

Question

您好，我正在尝试为具有可观察对象的组件编写 Angular 代码，但我无法测试广播服务中的 Angular 色服务调用。我收到一条错误消息，指出未调用该服务。我应该如何访问该服务？任何帮助，将不胜感激。谢谢。

这是我的可观察组件:

  ngOnInit(): void {

    this.subscription.add(
      this.broadcastService.subscribe('msal:acquireTokenSuccess', (payload) => {
        // do something here
        this.roleService.checkServerEventReviewers().subscribe(res => {
          this.userService.userDetails.role = res ? 'Data Steward' : 'Mosaic Consumer';
          if (this.isLoggedIn !== true) {
            const redirectUri = sessionStorage.getItem('redirectUri');
            if (redirectUri !== undefined || redirectUri !== null) {
              this.router.navigateByUrl(redirectUri);
            }
          }
          this.isLoggedIn = true;
};

这是我正在尝试的规范文件:

    describe('AppComponent', () => {
      beforeEach(() => {
       TestBed.configureTestingModule({
         imports: [RouterTestingModule],
         declarations: [AppComponent],
         providers: [WindowService, HttpClient, RoleService, UserService, HttpHandler, BroadcastService, MsalService,
        {
          provide: MSAL_CONFIG,  // MsalService needs config, this provides it.
          useFactory: () => ({   // Note this is an arrow fn that returns the config object
            redirectUri: window.location.origin + '/',
            clientID: mockData.clientID,
          }),
        }],
      schemas: [CUSTOM_ELEMENTS_SCHEMA]
    }).compileComponents();
  });

    it("Role should be Data Steward", fakeAsync (() => {
    const fn = 'msal:acquireTokenSuccess';
    const subscription = new Subscription();
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.debugElement.componentInstance;
    const spyOnBS = spyOn(app.broadcastService,'subscribe');
    const roleServiceCall = 
    spyOn(app.roleService,'checkServerEventReviewers');
    app.ngOnInit();
    tick();
    fixture.whenStable().then(() => {
      expect(spyOnBS).toHaveBeenCalled();
      expect(roleServiceCall).toHaveBeenCalled();
});
}));

Answer 1

如果您在组件文件而非规范文件中遇到错误，则将其存储到局部变量中并将其与您的 Angular 色服务一起使用

更新后的代码看起来像

ngOnInit(): void {

    const that = this; // STORE this into local variable 

    this.subscription.add(
      this.broadcastService.subscribe('msal:acquireTokenSuccess', (payload) => {
        ...
        // USE "that" instead of "this"
        that.roleService.checkServerEventReviewers().subscribe(res => {
          ...
        });
      });
    );