Angular:我如何在茉莉花中测试@HostListener？

Question

我在angular的组件中有下一个代码:

@HostListener('window:scroll', []) onWindowScroll() {
  this.showScrollToTop = false;
}

我怎样才能在茉莉花中测试这个？如何启动窗口滚动事件？

Answer 1

测试窗口:滚动:

it('should do something on window scroll', () => {
  window.dispatchEvent(new Event('scroll'));
  expect(...)....
});