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[英]How to unit test @hostlistener paste event using angular 7 karma/jasmine
[英]Angular: How I can test @HostListener in jasmine?
我在 angular 的組件中有下一個代碼:
@HostListener('window:scroll', []) onWindowScroll() {
this.showScrollToTop = false;
}
我如何在茉莉花中測試這個? 如何啟動窗口滾動事件?
測試窗口:滾動:
it('should do something on window scroll', () => {
window.dispatchEvent(new Event('scroll'));
expect(...)....
});
您可以嘗試通過在窗口上調用scrollTo
函數來使簡單的 JS 滾動。
如果你想滾動頂部,它將是:
window.scrollTo(0, 0);
更新
var scrollEvent = document.createEvent('CustomEvent');
scrollEvent.initCustomEvent( 'scroll', false, false, null );
window.dispatchEvent(scrollEvent)
it('Focus over elements', () => {
fixture.detectChanges();
const event = new Event('click', { bubbles: true });
const spyDocumentClick = spyOn(component, 'clickout').and.callThrough();
component.clickout(event);
expect(spyDocumentClick).toHaveBeenCalled();
});
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