43 lines
1.6 KiB
JavaScript
43 lines
1.6 KiB
JavaScript
import '~/behaviors/autosize';
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import { setHTMLFixture, resetHTMLFixture } from 'helpers/fixtures';
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jest.mock('~/helpers/startup_css_helper', () => {
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return {
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waitForCSSLoaded: jest.fn().mockImplementation((cb) => {
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// This is a hack:
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// autosize.js will execute and modify the DOM
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// whenever waitForCSSLoaded calls its callback function.
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// This setTimeout is here because everything within setTimeout will be queued
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// as async code until the current call stack is executed.
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// If we would not do this, the mock for waitForCSSLoaded would call its callback
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// before the fixture in the beforeEach is set and the Test would fail.
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// more on this here: https://johnresig.com/blog/how-javascript-timers-work/
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setTimeout(() => {
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cb.apply();
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}, 0);
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}),
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};
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});
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describe('Autosize behavior', () => {
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beforeEach(() => {
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setHTMLFixture('<textarea class="js-autosize"></textarea>');
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});
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afterEach(() => {
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resetHTMLFixture();
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});
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it('is applied to the textarea', () => {
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// This is the second part of the Hack:
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// Because we are forcing the mock for WaitForCSSLoaded and the very end of our callstack
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// to call its callback. This querySelector needs to go to the very end of our callstack
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// as well, if we would not have this jest.runOnlyPendingTimers here, the querySelector
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// would not run and the test would fail.
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jest.runOnlyPendingTimers();
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const textarea = document.querySelector('textarea');
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expect(textarea.classList).toContain('js-autosize-initialized');
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});
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});
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