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