Angular 7 - 通过订阅对可观察对象进行单元测试

Question

您好，我正在尝试为具有可观察对象的组件编写 Angular 代码，但我无法测试订阅功能。我应该如何访问订阅功能？任何帮助，将不胜感激。谢谢。

这是我的可观察组件:

  ngOnInit(): void {

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

    if (this.environmentName === 'QA' || this.environmentName === 'LOCAL' || this.environmentName === 'QA-STAGING') {
      console.log('environmentName');
      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) => {
        // do something here
        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范文件:

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
        });
    );

Answer 1

这不是对您问题的直接回答，而是间接回答。在您的组件中包含所有这些业务逻辑可能不是什么好主意。我建议使用库来协助您进行所有状态管理(我们使用 NgRX )。然后可以将许多此类逻辑移至服务或其他更易于测试的纯方法中。