Question

我试图模拟对进行http呼叫的服务的调用。我想在模拟中提供假数据，并在我的测试中检查它。

这是我的设置。

beforeEach(() => {
  fixture = TestBed.createComponent(MhSearchFormComponent);
  component = fixture.componentInstance;
  component.propertyCount = 0;
  spyOn(component._searchService, 'getCount').and.returnValue({ subscribe: () => {} });
  fixture.detectChanges();
});

我想在间谍的回归中重新分配propertyCount值。

这是我的测试：

  it('should get a count on load', () => {
    expect(component.propertyCount).toBe('1000');
  });

我已经尝试过了，但这显然是错误的

spyOn(component._searchService, 'getCount').and.returnValue({ subscribe: () => {'Count':1000} });

Answer 1

我不知道你的组件/服务是怎样的。请尝试以下示例。如果您遇到任何问题，请发布组件和服务模板。

beforeEach(() => {
  fixture = TestBed.createComponent(MhSearchFormComponent);
  component = fixture.componentInstance;
  component.propertyCount = 0;
  // To get injected Service Instance from Component.
  const searchService = fixture.debugElement.injector.get(SearchService);
  // Observable.of('1000') will ensure the subscribe method and its handling
  // And the subscriber will get '1000' as argument.
  spyOn(searchService, 'getCount').and.returnValue(Observable.of('1000'));

  fixture.detectChanges();
});

it('should get a count on load', () => {
  expect(component.propertyCount).toBe('1000');
});

将数据传递给spyOn和ExitValue

1 个答案: