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import { setHTMLFixture, resetHTMLFixture } from 'helpers/fixtures';
import { waitForCSSLoaded } from '~/helpers/startup_css_helper';
describe('waitForCSSLoaded', () => {
let mockedCallback;
beforeEach(() => {
mockedCallback = jest.fn();
});
describe('Promise-like api', () => {
it('can be used with a callback', async () => {
await waitForCSSLoaded(mockedCallback);
expect(mockedCallback).toHaveBeenCalledTimes(1);
});
it('can be used as a promise', async () => {
await waitForCSSLoaded().then(mockedCallback);
expect(mockedCallback).toHaveBeenCalledTimes(1);
});
});
describe('when gon features is not provided', () => {
let originalGon;
beforeEach(() => {
originalGon = window.gon;
window.gon = null;
});
afterEach(() => {
window.gon = originalGon;
});
it('should invoke the action right away', async () => {
const events = waitForCSSLoaded(mockedCallback);
await events;
expect(mockedCallback).toHaveBeenCalledTimes(1);
});
});
describe('with startup css enabled', () => {
it('should dispatch CSSLoaded when the assets are cached or already loaded', async () => {
setHTMLFixture(`
<link href="one.css" data-startupcss="loaded">
<link href="two.css" data-startupcss="loaded">
`);
await waitForCSSLoaded(mockedCallback);
expect(mockedCallback).toHaveBeenCalledTimes(1);
resetHTMLFixture();
});
it('should wait to call CssLoaded until the assets are loaded', async () => {
setHTMLFixture(`
<link href="one.css" data-startupcss="loading">
<link href="two.css" data-startupcss="loading">
`);
const events = waitForCSSLoaded(mockedCallback);
document.querySelectorAll('[data-startupcss="loading"]').forEach((elem) => {
// eslint-disable-next-line no-param-reassign
elem.dataset.startupcss = 'loaded';
});
document.dispatchEvent(new CustomEvent('CSSStartupLinkLoaded'));
await events;
expect(mockedCallback).toHaveBeenCalledTimes(1);
resetHTMLFixture();
});
});
});
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