85 lines
2.3 KiB
JavaScript
85 lines
2.3 KiB
JavaScript
import { waitForCSSLoaded } from '~/helpers/startup_css_helper';
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describe('waitForCSSLoaded', () => {
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let mockedCallback;
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beforeEach(() => {
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mockedCallback = jest.fn();
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});
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describe('Promise-like api', () => {
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it('can be used with a callback', async () => {
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await waitForCSSLoaded(mockedCallback);
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expect(mockedCallback).toHaveBeenCalledTimes(1);
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});
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it('can be used as a promise', async () => {
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await waitForCSSLoaded().then(mockedCallback);
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expect(mockedCallback).toHaveBeenCalledTimes(1);
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});
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});
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describe('when gon features is not provided', () => {
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let originalGon;
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beforeEach(() => {
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originalGon = window.gon;
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window.gon = null;
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});
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afterEach(() => {
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window.gon = originalGon;
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});
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it('should invoke the action right away', async () => {
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const events = waitForCSSLoaded(mockedCallback);
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await events;
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expect(mockedCallback).toHaveBeenCalledTimes(1);
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});
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});
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describe('with startup css disabled', () => {
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gon.features = {
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startupCss: false,
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};
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it('should invoke the action right away', async () => {
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const events = waitForCSSLoaded(mockedCallback);
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await events;
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expect(mockedCallback).toHaveBeenCalledTimes(1);
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});
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});
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describe('with startup css enabled', () => {
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gon.features = {
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startupCss: true,
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};
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it('should dispatch CSSLoaded when the assets are cached or already loaded', async () => {
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setFixtures(`
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<link href="one.css" data-startupcss="loaded">
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<link href="two.css" data-startupcss="loaded">
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`);
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await waitForCSSLoaded(mockedCallback);
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expect(mockedCallback).toHaveBeenCalledTimes(1);
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});
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it('should wait to call CssLoaded until the assets are loaded', async () => {
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setFixtures(`
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<link href="one.css" data-startupcss="loading">
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<link href="two.css" data-startupcss="loading">
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`);
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const events = waitForCSSLoaded(mockedCallback);
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document
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.querySelectorAll('[data-startupcss="loading"]')
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.forEach(elem => elem.setAttribute('data-startupcss', 'loaded'));
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document.dispatchEvent(new CustomEvent('CSSStartupLinkLoaded'));
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await events;
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expect(mockedCallback).toHaveBeenCalledTimes(1);
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});
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});
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});
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