嗨，我正在尝试为具有可观察性的组件编写角度代码，但无法访问订阅函数。 我应该如何访问订阅功能以测试其中的代码？我们将不胜感激。谢谢。

这是我可观察到的部分：

  ngOnInit(): void {

    if (this.authService.getUser() !== null || this.authService.getUser() !== undefined) {
      this.userService.userDetails = this.authService.getUser();
    }

    if (this.environmentName === 'QA' || this.environmentName === 'LOCAL' || this.environmentName === 'QA-STAGING') {
      this.authService.acquireTokenSilent(['api://012fdc3a-c966-4312-9b5c-301f097c1803/server']);
    } else {
      this.authService.acquireTokenSilent(['api://58a80bb5-906b-4ec0-9b41-7a78a07125af/server']);
    }

    this.subscription.add(
      this.broadcastService.subscribe('msal:acquireTokenSuccess',(payload) => {
        console.log('acquire token success ' + JSON.stringify(payload));
        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格文件：

describe('AppComponent',() => {
  beforeEach(() => {
    let subscription: Subscription = new Subscription();
    TestBed.configureTestingModule({
      imports: [RouterTestingModule],declarations: [AppComponent],providers: [WindowService,RoleService,HttpClient,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();
  });

  describe(':',() => {
    function setup() {
      const fixture = TestBed.createComponent(AppComponent);
      const app = fixture.debugElement.componentInstance;
      const compiled = fixture.debugElement.nativeElement;
      return {fixture,app,compiled};
    }

    it('Init with QA environment',() => {
      const {app} = setup();
      spyOn(app.authService,'getUser').and.returnValue(mockData.userDetails);
      spyOn(app.authService,'acquireTokenSilent').and.returnValue('msal:acquireTokenSuccess');
      app.ngOnInit();
      app.subscription.add(
        app.broadcastService.subscribe('msal:acquireTokenSuccess',() => {
        // do something here
        });
    );