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tdc 專案中可以常看

  • login.component.spec.ts
  • sign up

注入一個 service (angular)​

如果在 test 中要用 service 的時候需要用 **TestBed.inject() **的方式來引入

let analyticsService = AnalyticsService;
beforeEach(()=> {
  ...
  analyticsService = TestBed.inject(AnalyticsService);
})

引用物件的東西​

jest.spyOn(object, methodName)

範例：2

const video = {
  play() {
    return true;
  },
};
module.exports = video;
const video = require('./video');

test('plays video', () => {
  const spy = jest.spyOn(video, 'play');
  const isPlaying = video.play();

  expect(spy).toHaveBeenCalled();
  expect(isPlaying).toBe(true);

  spy.mockRestore();
});

如果是要放入假的資料可用 **mockReturnValue()**來去傳入假的資料

const spy = jest.spyOn(apiService, 'post').mockReturnValue(of({}));