58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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);
|
|
});
|
|
});
|
|
});
|