113 lines
3.5 KiB
JavaScript
113 lines
3.5 KiB
JavaScript
import { setHTMLFixture, resetHTMLFixture } from 'helpers/fixtures';
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import findAndFollowLink from '~/lib/utils/navigation_utility';
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import * as navigationUtils from '~/lib/utils/navigation_utility';
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import { visitUrl } from '~/lib/utils/url_utility';
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jest.mock('~/lib/utils/url_utility');
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describe('findAndFollowLink', () => {
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it('visits a link when the selector exists', () => {
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const href = '/some/path';
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setHTMLFixture(`<a class="my-shortcut" href="${href}">link</a>`);
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findAndFollowLink('.my-shortcut');
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expect(visitUrl).toHaveBeenCalledWith(href);
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resetHTMLFixture();
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});
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it('does not throw an exception when the selector does not exist', () => {
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// this should not throw an exception
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findAndFollowLink('.this-selector-does-not-exist');
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expect(visitUrl).not.toHaveBeenCalled();
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});
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});
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describe('prefetchDocument', () => {
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it('creates a prefetch link tag', () => {
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const linkElement = document.createElement('link');
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jest.spyOn(document, 'createElement').mockImplementation(() => linkElement);
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jest.spyOn(document.head, 'appendChild');
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navigationUtils.prefetchDocument('index.htm');
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expect(document.head.appendChild).toHaveBeenCalledWith(linkElement);
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expect(linkElement.href).toEqual('http://test.host/index.htm');
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expect(linkElement.rel).toEqual('prefetch');
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expect(linkElement.getAttribute('as')).toEqual('document');
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});
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});
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describe('initPrefetchLinks', () => {
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let newLink;
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beforeEach(() => {
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newLink = document.createElement('a');
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newLink.href = 'index_prefetch.htm';
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newLink.classList.add('js-test-prefetch-link');
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document.body.appendChild(newLink);
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});
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it('adds to all links mouse out handlers when hovered', () => {
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const mouseOverEvent = new Event('mouseover');
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jest.spyOn(newLink, 'addEventListener');
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navigationUtils.initPrefetchLinks('.js-test-prefetch-link');
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newLink.dispatchEvent(mouseOverEvent);
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expect(newLink.addEventListener).toHaveBeenCalled();
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});
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it('is not fired when less then 100ms over link', () => {
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const mouseOverEvent = new Event('mouseover');
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const mouseOutEvent = new Event('mouseout');
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jest.spyOn(newLink, 'addEventListener');
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jest.spyOn(navigationUtils, 'prefetchDocument').mockImplementation(() => true);
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navigationUtils.initPrefetchLinks('.js-test-prefetch-link');
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newLink.dispatchEvent(mouseOverEvent);
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newLink.dispatchEvent(mouseOutEvent);
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expect(navigationUtils.prefetchDocument).not.toHaveBeenCalled();
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});
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describe('executes correctly when hovering long enough', () => {
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const mouseOverEvent = new Event('mouseover');
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beforeEach(() => {
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jest.spyOn(global, 'setTimeout');
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jest.spyOn(newLink, 'removeEventListener');
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});
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it('calls prefetchDocument which adds to document', () => {
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jest.spyOn(document.head, 'appendChild');
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navigationUtils.initPrefetchLinks('.js-test-prefetch-link');
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newLink.dispatchEvent(mouseOverEvent);
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jest.runAllTimers();
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expect(setTimeout).toHaveBeenCalledWith(expect.any(Function), 100);
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expect(document.head.appendChild).toHaveBeenCalled();
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});
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it('removes Event Listener when fired so only done once', () => {
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navigationUtils.initPrefetchLinks('.js-test-prefetch-link');
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newLink.dispatchEvent(mouseOverEvent);
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jest.runAllTimers();
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expect(newLink.removeEventListener).toHaveBeenCalledWith(
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'mouseover',
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expect.any(Function),
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true,
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);
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});
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});
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});
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