58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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import LazyLoader from '~/lazy_loader';
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let lazyLoader = null;
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describe('LazyLoader', function () {
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preloadFixtures('issues/issue_with_comment.html.raw');
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beforeEach(function () {
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loadFixtures('issues/issue_with_comment.html.raw');
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lazyLoader = new LazyLoader({
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observerNode: 'body',
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});
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// Doing everything that happens normally in onload
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lazyLoader.loadCheck();
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});
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describe('behavior', function () {
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it('should copy value from data-src to src for img 1', function (done) {
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const img = document.querySelectorAll('img[data-src]')[0];
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const originalDataSrc = img.getAttribute('data-src');
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img.scrollIntoView();
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setTimeout(() => {
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expect(img.getAttribute('src')).toBe(originalDataSrc);
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expect(document.getElementsByClassName('js-lazy-loaded').length).toBeGreaterThan(0);
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done();
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}, 100);
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});
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it('should lazy load dynamically added data-src images', function (done) {
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const newImg = document.createElement('img');
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const testPath = '/img/testimg.png';
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newImg.className = 'lazy';
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newImg.setAttribute('data-src', testPath);
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document.body.appendChild(newImg);
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newImg.scrollIntoView();
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setTimeout(() => {
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expect(newImg.getAttribute('src')).toBe(testPath);
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expect(document.getElementsByClassName('js-lazy-loaded').length).toBeGreaterThan(0);
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done();
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}, 100);
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});
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it('should not alter normal images', function (done) {
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const newImg = document.createElement('img');
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const testPath = '/img/testimg.png';
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newImg.setAttribute('src', testPath);
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document.body.appendChild(newImg);
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newImg.scrollIntoView();
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setTimeout(() => {
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expect(newImg).not.toHaveClass('js-lazy-loaded');
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done();
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}, 100);
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});
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});
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});
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