在Jasmine中使用2种不同的模拟进行测试

如何解决在Jasmine中使用2种不同的模拟进行测试

我有这样的ts后卫：

@Injectable({
  providedIn: 'root'
})

export class AppEssentialsGuard implements CanActivate {

  private readonly DEFAULT_APP_ID = 'def';

  constructor(private appsService: AppsService) {}

  canActivate(next: ActivatedRouteSnapshot,state: RouterStateSnapshot): boolean {
    const url = this.getDefaultAppUrl();
    if (url) {
      window.open(url);
    }
    return false;
  }

  private getDefaultAppUrl(): string {
    const myApp = this.appsService.getAllApps()
      .find(app => app.appId === this.DEFAULT_APP_ID);
    return myApp ? myApp.url : null;
  }
}

我正在为此编写测试，如下所示：

describe('AppEssentialsGuard',() => {
  let guard: AppEssentialsGuard;
  let appsService: AppsService;

  beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [
        mockProvider(RequesterService),{provide: AppsService,useClass: AppsServiceMock}
      ]
    });
    appsService = TestBed.inject(AppsService);
    guard = TestBed.inject(AppEssentialsGuard);
  });

  it('should be created',() => {
    expect(guard).toBeTruthy();
  });

  it( 'should open new default app window',() => {
    spyOn(window,'open');
    let returnValue = guard.canActivate(null,null);
    expect( window.open ).toHaveBeenCalledWith("https://appstore.com/");
    expect(returnValue).toBeFalsy();
  });


});

现在进行快乐流测试，我正在使用useClass中指定的AppsServiceMock，它返回一组虚拟应用程序，包括一个ID为'def'的虚拟应用程序。

我的问题是，我还想测试该URL返回一个空数组的情况，或者一个没有'def'应用程序的情况，如何测试这两种情况？我不知道如何使用另一个模拟

我是茉莉花的新手

谢谢！

解决方法

您可以通过监视getAllApps并在声明之前返回一个值来实现所需的行为。监视并返回值将忽略原始的细节实现，并将始终返回您指定的值。

// happy path;
it( 'should open new default app window',() => {
    spyOn(appService,'getAllApps').and.returnValue([/* add an array of elements you would like */]);
    spyOn(window,'open');
    let returnValue = guard.canActivate(null,null);
    expect( window.open ).toHaveBeenCalledWith("https://appstore.com/");
    expect(returnValue).toBeFalsy();
  });
// empty array path
it( 'should not open new default app window','getAllApps').and.returnValue([]);
    spyOn(window,null);
    expect( window.open ).not.toHaveBeenCalled(); // change your assertion here
    expect(returnValue).toBeFalsy();
  });