问错误:对于条件“匹配URL: xyz"，应有一个匹配请求，但未找到

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const testBedBase = {
  imports: [HttpClientTestingModule],
  providers: [
    ApiService,
    CacheService,
    { provide: HTTP_INTERCEPTORS, useClass: CacheInterceptor, multi: true }
  ]
};

describe('CacheInterceptor with cached data', () => {
  let httpMock: HttpTestingController;
  let apiService: ApiService;
  let cacheService: CacheService;

  beforeEach(() => {
    TestBed.configureTestingModule(testBedBase);
    httpMock = TestBed.get(HttpTestingController);
    apiService = TestBed.get(ApiService);
    cacheService = TestBed.get(CacheService);
  });

  afterEach(() => {
    httpMock.verify();
  });

  it('should respond with cached data if available', async( () => {
    const testUrl = `http://localhost:3000/api/v1/employee/123`;
    spyOn(cacheService, 'get').and.returnValue(mockResponse);
    apiService.getEmployee('123').subscribe(res => {

      // apiService calls http://localhost:3000/api/v1/employee/123 as tested in the interceptor

      expect(res).toBeTruthy();
      expect(res).toBe(mockResponse);
    });
    const req = httpMock.expectOne(testUrl);
    req.flush(mockResponse);
  }));
})

intercept(req: HttpRequest<any>, next: HttpHandler) {
    const cachedResponse = this.cache.get(req.url);
    console.log(cachedResponse, req.url); // this returns the http://localhost:3000/api/v1/employee/123 as seen in the getEmployee request
    return cachedResponse ? Observable.of(cachedResponse) : this.sendRequest(req, next);
  }