unit-testing - vue.js unit :test w test-utils and Jest : How can I test - window. open() 在一个方法中？

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();

但是我该如何测试(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

您可以更换 window.open使用一个 Jest 模拟函数，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');