angular - HttpHeaders 和 lazyupdate Angular 4 和 Karma

Question

我对 HttpHeaders (angular 4.3.0) 和 Karma 有疑问。我编写了一些测试，当我使用 npm test 命令运行它们时，http 查询是未经授权的，因为未设置 token (X-Auth-Token)。当我使用控制台在浏览器中运行相同的部分时，X-Auth-Token 已设置并且一切正常。

我能看到的唯一区别是 HttpHeaders 对象和 lazyUpdate。

无测试模式

karma 报应

代码:

类别.服务.spec.ts

    describe('Service : Category', () => {

  // setup
  beforeEach(() => TestBed.configureTestingModule({
      imports: [ HttpClientModule, LocalStorageModule.withConfig(localStorageConfig), TranslateModule.forRoot({
        loader: { provide: TranslateLoader, useClass: TranslateFakeLoader }
      })],
      providers: [CategoryService, LoaderService, LocalStorageService
      ]
    }));


    it('should list the categories', () => {

        let categoryService = TestBed.get(CategoryService);

        categoryService.apiRoutes = ApiCategoryRoutes;
        categoryService.modelName = "category";

        let actualCategories = [];

        // categoryService expends APIResolverService
        let observable = categoryService.find(); 

        observable.subscribe(data => {

            actualCategories = data;
        });

        console.log("actualCategories");
        console.log(actualCategories);

    });

 });

apiResolver.service.ts(categoryService对其进行扩展，类目服务无具体代码)

export abstract class APIResolverService {

...

  public find() {

      this.showLoader();

      let url = this.getUrl(0, true);

      let headers = this.setHttpHeaders(); 

      console.log("headers");
      console.log(headers);

      let observable = this.http.get(url, {headers : headers})
      .map(res => this.manageResponse(res, true, true)).share();

      observable.subscribe(data => this.hideLoader(), error => this.hideLoader());

      return observable;
  }

  ...

    public setHttpHeaders(){

      let valueToken: string = JSON.stringify(this.localStorage.get('token'));

      let myHeaders = new HttpHeaders()
      .set('Content-Type', 'application/json')
      .set('Accept', 'application/json')
      .set('Accept-Language', "en")
      .set('X-Auth-Token', valueToken.replace(/['"]+/g, ''));

      return myHeaders;
  }

}

有人可以解释一下吗？

Answer 1

我在测试设置一些请求 header 的拦截器时遇到了类似的问题。我在测试期间做错的是没有设置标题之一(保留它 undefined)——我没有深入研究 Angular 代码，但这似乎遗漏了“lazyInit”属性设置为 null，这将停止触发“init”调用(基本上设置 header ):

    HttpHeaders.prototype.init = function () {
        var _this = this;
        if (!!this.lazyInit) {
            if (this.lazyInit instanceof HttpHeaders) {
                this.copyFrom(this.lazyInit);
            }
            else {
                this.lazyInit();
            }
            this.lazyInit = null;
            if (!!this.lazyUpdate) {
                this.lazyUpdate.forEach(function (update) { return _this.applyUpdate(update); });
                this.lazyUpdate = null;
            }
        }
    };

github 上有一个问题与此有关。参见 this评论。