旁观者:覆盖单个测试的提供者(角度通用) [英] Spectator: override provider for single test (angular universal)

问题描述

我构建了一个小型 Angular 应用程序，现在我正在编写单元测试.到目前为止一切顺利，但是当我尝试测试我的 authGuard 时，我遇到了一些问题.我正在使用 观众.我在规范的提供者部分提供了 platformId，但我希望能够覆盖它，以便我可以测试值服务器"和浏览器"的场景我的代码用于 authGuard:

I built a small angular app and now I'm writing unit tests. So far so good, but when I try to test my authGuard I ran into some problems. I am using Spectator. I provide the platformId in the providers section in my spec, but I want to be able to overwrite it so I can test scenarios where for values 'server' as well as 'browser' My code is for the authGuard:

@Injectable({
  providedIn: 'root',
})
export class AuthGuard implements CanActivate {
  constructor(
    private authService: AuthService,
    private router: Router,
    @Inject(PLATFORM_ID) private platformId: Object,
  ) {}

  canActivate(
    _route: ActivatedRouteSnapshot,
    _state: RouterStateSnapshot,
  ): boolean | UrlTree | Promise<boolean | UrlTree> | Observable<boolean | UrlTree> {
    if (isPlatformServer(this.platformId)) {
      console.log('server');
      return true;
    } else {
      console.log('browser');
      this.authService.autoLogin();
      return this.authService.user.pipe(
        take(1),
        map((user) => {
          console.log('user', user);
          if (!!user) {
            return true;
          }
          console.log('navugate');
          this.router.navigate(['/auth']);
          return false;
        }),
      );
    }
  }
}

和规范文件:

describe('AuthGuard', () => {
  let spectator: SpectatorService<AuthGuard>;
  const config = {
    service: AuthGuard,
    imports: [RouterTestingModule, HttpClientTestingModule],
    providers: [AppRoutingModule, AuthService, { provide: PLATFORM_ID, useValue: 'server' }],
    schemas: [CUSTOM_ELEMENTS_SCHEMA],
  };
  const createService = createServiceFactory(config);

// some other tests here ....

  it('should should navigate to /auth if running on browser and not authenticated', () => {
    config.providers = [AppRoutingModule, { provide: PLATFORM_ID, useValue: 'browser' }];
    spectator = createService();
    const spyNavigate = spyOn(spectator.service['router'], 'navigate').and.callThrough();
    const user = new User('[e-mail]', 'id', 'token', new Date(10000));
    spectator.service['authService'].user.next(user);
    spectator.service.canActivate(null, null);
    expect(spyNavigate).toHaveBeenCalled();
  });
});

现在当我运行这个覆盖配置不起作用.这是意料之中的，因为在更改配置对象之前已经传递了它.但是如何实现我的目标呢?我试过这个:

Now when I run this overriding the config does not work. This is to be expected, since the config object was already passed on before altering it. But how to achieve my goal? I tried this:

describe('AuthGuard', () => {
  let spectator: SpectatorService<AuthGuard>;
  const config = {
    service: AuthGuard,
    imports: [RouterTestingModule, HttpClientTestingModule],
    providers: [AppRoutingModule, AuthService, { provide: PLATFORM_ID, useValue: 'server' }],
    schemas: [CUSTOM_ELEMENTS_SCHEMA],
  };

// some other tests here ....

  it('should should navigate to /auth if running on browser and not authenticated', () => {
    config.providers = [AppRoutingModule, { provide: PLATFORM_ID, useValue: 'browser' }];
    const createService = createServiceFactory(config);
    spectator = createService();
    const spyNavigate = spyOn(spectator.service['router'], 'navigate').and.callThrough();
    const user = new User('[e-mail]', 'id', 'token', new Date(10000));
    spectator.service['authService'].user.next(user);
    spectator.service.canActivate(null, null);
    expect(spyNavigate).toHaveBeenCalled();
  });
});

但是这给了我错误 Error: 'beforeEach' should only be used in 'describe' function 我发现这很令人困惑，因为我没有在本规范中使用 beforeEach.

But that gave me the error Error: 'beforeEach' should only be used in 'describe' function which I found confusing since I am not using beforeEach in this spec.

我觉得像 Spectator 这样的工具应该有一个简单的方法来做到这一点，它不是那么奇特，对吧?

I feel that some tool like Spectator should probably have an easy way to do this, it is not that exotic, right?

感谢任何帮助！

推荐答案

您可以通过将参数传递给 createService() 来实现:

You can do this by passing arguments to createService():

createService({
  providers: [...]
});

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