RouteLink 测试 angular2答案

【问题标题】：RouteLink testing angular2RouteLink 测试 angular2
【发布时间】：2016-09-21 12:38:58
【问题描述】：

我正在测试一个像这样使用 RouteLink 指令的组件：

let comp: AppComponent;
let fixture: ComponentFixture<AppComponent>;
let el: DebugElement;
let injector: Injector;
let languageService: TranslateService;
let location: Location;
let backend: MockBackend;
let connection: MockConnection; // this will be set when a new connection is  emitted from the backend.

let mockRouter: any;
let mockActivatedRoute: any;
const mockBackendResponse = (connection: MockConnection, response: string) => {
  connection.mockRespond(new Response(new ResponseOptions({ body: response })));
};
describe('testComponent', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      declarations: [AppComponent],
      imports: [HttpModule, RouterTestingModule, TranslateModule.forRoot({
        provide: TranslateLoader,
        useFactory: (http: Http) => new TranslateStaticLoader(http, './assets/language', '.json'),
        deps: [Http]
      })],
      providers: [
        { provide: LanguageService, useClass: LanguageService },
        { provide: BackendLocatorService, useClass: BackendLocatorService },
        { provide: XHRBackend, useClass: MockBackend },
        { provide: APP_BASE_HREF, useValue: '/' }
      ]
    });

    injector = getTestBed();
    backend = injector.get(XHRBackend);
    languageService = injector.get(TranslateService);
    location = injector.get(Location);

    backend.connections.subscribe((c: MockConnection) => connection = c);
    fixture = TestBed.createComponent(AppComponent);
    comp = fixture.componentInstance; // BannerComponent test instance
    // get title DebugElement by element name
  });
  it('is defined', () => {
    expect(TranslateService).toBeDefined();
    expect(languageService).toBeDefined();
    expect(languageService instanceof TranslateService).toBeTruthy();
  });

  it('ROUTLINK CLICK', () => {
    fixture.detectChanges();
    let links = fixture.nativeElement.querySelectorAll('a');
    links[1].click();
    console.log(links[0]);
    expect(location.path()).toBe('/home');
  });
});

我尝试获取 <a> 标记并单击它以获取当前路径，但问题是当前路径始终为 '' ，什么都没有:( 这是错误：

 Chrome 53.0.2785 (Windows 7 0.0.0) testComponent ROUTLINK CLICK FAILED
 Expected '' to be '/home'.

有什么想法吗？

【问题讨论】：

标签： angular karma-jasmine angular2-routing angular2-testing routelink

【解决方案1】：

所以你有一个当前错误，在你修复它之后，你会得到另一个错误。

当前错误Expected '' to be '/home'是因为锚点上的click()涉及异步事件处理。但是您的期望是同步的，并且发生在 click() 之后，异步操作完成之前。

要解决此问题，您可以测试async，然后在click() 之后，您可以通过调用等待异步操作 fixture.whenStable()

import { async } from '@angular/core/testing';

                  // use async
it('ROUTLINK CLICK', async(() => {
  fixture.detectChanges();
  let links = fixture.nativeElement.querySelectorAll('a');
  links[1].click();
  fixture.whenStable().then(() => {
    expect(location.path()).toBe('/home');
  });
}));

一旦你解决了这个问题，你就会遇到另一个问题。目前您没有为RouterTestingModule 配置路由。通过调用RouterTestingModule.withRoutes(Routes) 进行设置。您可以使用真实的应用程序路由，或者如果您愿意，可以设置一些假路由进行测试。 See example.

【讨论】：