vue.js unit:test w test-utils 和 Jest：如何在方法中测试 window.open()？

Question

在我的组件 AudioPlayer 中，我有一个 download() 方法：

download() {
  this.audio.pause();
  window.open(this.file, "download");
},

我可以测试第一行：

this.audio.pause();

但是我如何测试（我应该吗？第二行：

window.open(this.file, "download");

这是我当前的规范文件测试

  it("should open a window from downloadBtn", async () => {
    // jsdom doesn't support any loading or playback media operations. 
    // As a workaround you can add a few stubs in your test setup:
    window.HTMLMediaElement.prototype.pause = () => { /* do nothing */ };
    // given
    const wrapper = mount(AudioPlayer, {
      attachToDocument: true,
      propsData: {
        autoPlay: false,
        file: file,
        ended,
        canPlay
      }
    });
    const downloadBtn = wrapper.find("#downloadBtn");
    wrapper.vm.loaded = true; // enable downloadBtn
    // when
    downloadBtn.trigger("click");
    await wrapper.vm.$nextTick();
    // then
    expect(wrapper.vm.paused).toBe(true);
  });

感谢反馈

Answer 1

你可以window.open用一个 jest 模拟函数替换，然后像往常一样测试模拟调用。

window.open = jest.fn();
window.open('foo');
expect(window.open).toHaveBeenCalledWith('foo');