角度服务测试：找不到名称’asyncData’

let httpClientSpy: { get: jasmine.Spy };
let heroService: HeroService;

beforeEach(() => {
  // TODO: spy on other methods too
  httpClientSpy = jasmine.createSpyObj('HttpClient',['get']);
  heroService = new HeroService(<any> httpClientSpy);
});

it('should return expected heroes (HttpClient called once)',() => {
  const expectedHeroes: Hero[] =
    [{ id: 1,name: 'A' },{ id: 2,name: 'B' }];

  httpClientSpy.get.and.returnValue(asyncData(expectedHeroes));

  heroService.getHeroes().subscribe(
    heroes => expect(heroes).toEqual(expectedHeroes,'expected heroes'),fail
  );
  expect(httpClientSpy.get.calls.count()).toBe(1,'one call');
});

我试图完全复制它,但它给了我以下错误：

ERROR in src/app/services/find-locals.service.spec.ts(17,38): error
TS2304: Cannot find name ‘asyncData’.

有人可以帮我替换这个吗？或者告诉我在其他地方可能做错了什么？

以下是从Angular文档复制的测试文件：

import {FindLocalsService} from './find-locals.service';

import {HttpClient,HttpClientModule} from '@angular/common/http';

let findLocalsService: FindLocalsService;
let httpClientSpy: { get: jasmine.Spy,post: jasmine.Spy };

beforeEach(() => {
  httpClientSpy = jasmine.createSpyObj('HttpClient',['get','post']);
  findLocalsService = new FindLocalsService(<any> httpClientSpy,null);
});

it('should save location to server',function () {
  const expectedData: any =
    [{ id: 1,name: 'B' }];

  httpClientSpy.post.and.returnValue(asyncData(expectedData));

  findLocalsService.saveLocation('something').subscribe(
    data => expect(data).toEqual(expectedData),fail
  );

  expect(httpClientSpy.post.calls.count()).toBe(1,'one call');
});

这是服务本身

@Injectable()

export class FindLocalsService {

    constructor(private http: HttpClient,private authService: AuthenticationService){}

    saveLocation(locationObj){
        return this.http.post(url + '/findLocals/saveLocation',locationObj);
    }

    getThreeClosestPlayers() {
        const userId = this.authService.currentUser().user._id;
        console.log('entered 3 closest service',userId);

        return this.http.get(url + '/findLocals/getThreeClosestPlayers/' + userId)
            .pipe(
              map((data: any) => data.obj),catchError(this.handleError)
              )
    }
}