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One of the simplest of our JavaScript files to test how difficult this is. Answer is not too bad and includes the file needing a DOM to operate on and jQuery in the global scope.
85 lines
1.8 KiB
JavaScript
85 lines
1.8 KiB
JavaScript
beforeAll(() => {
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// set up jQuery
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window.jQuery = require('jquery');
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$ = window.jQuery;
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// load module code
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require('govuk_frontend_toolkit/javascripts/govuk/modules.js');
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require('../../app/assets/javascripts/autofocus.js');
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});
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afterAll(() => {
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window.jQuery = null;
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$ = null;
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delete window.GOVUK;
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});
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describe('Autofocus', () => {
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let focusHandler;
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let search;
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beforeEach(() => {
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// set up DOM
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document.body.innerHTML =
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`<div data-module="autofocus">
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<label class="form-label" for="search">
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Search by name
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</label>
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<input autocomplete="off" class="form-control form-control-1-1" id="search" name="search" type="search" value="">
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</div>`;
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focusHandler = jest.fn();
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search = document.getElementById('search');
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search.addEventListener('focus', focusHandler, false);
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});
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afterEach(() => {
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document.body.innerHTML = '';
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search.removeEventListener('focus', focusHandler);
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focusHandler = null;
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});
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test('is focused when modules start', () => {
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// start module
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window.GOVUK.modules.start();
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expect(focusHandler).toHaveBeenCalled();
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});
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test('is not focused if the window has scrolled', () => {
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// mock the window being scrolled 25px
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$.prototype.scrollTop = jest.fn(() => 25);
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// start module
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window.GOVUK.modules.start();
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expect(focusHandler).not.toHaveBeenCalled();
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});
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test('is focused if the window has scrolled but the force-focus flag is set', () => {
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// mock the window being scrolled 25px
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$.prototype.scrollTop = jest.fn(() => 25);
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// set the force-focus flag
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document.querySelector('div').setAttribute('data-force-focus', true);
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// start module
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window.GOVUK.modules.start();
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expect(focusHandler).toHaveBeenCalled();
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});
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});
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