app-component-spec-setup.ts

describe('AppComponent', () => {
  let component: AppComponent;
  let fixture: ComponentFixture<AppComponent>;
  let httpMock: HttpTestingController;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      declarations: [AppComponent]
    })
      .compileComponents();

    httpMock = TestBed.get(HttpTestingController);
  }));
});