244 lines
8 KiB
JavaScript
244 lines
8 KiB
JavaScript
import LazyLoader from '~/lazy_loader';
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import { TEST_HOST } from './test_constants';
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import scrollIntoViewPromise from './helpers/scroll_into_view_promise';
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import waitForPromises from './helpers/wait_for_promises';
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import waitForAttributeChange from './helpers/wait_for_attribute_change';
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const execImmediately = callback => {
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callback();
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};
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describe('LazyLoader', function() {
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let lazyLoader = null;
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preloadFixtures('issues/issue_with_comment.html');
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describe('without IntersectionObserver', () => {
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beforeEach(function() {
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loadFixtures('issues/issue_with_comment.html');
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lazyLoader = new LazyLoader({
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observerNode: 'foobar',
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});
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spyOn(LazyLoader, 'supportsIntersectionObserver').and.callFake(() => false);
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spyOn(LazyLoader, 'loadImage').and.callThrough();
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spyOn(window, 'requestAnimationFrame').and.callFake(execImmediately);
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spyOn(window, 'requestIdleCallback').and.callFake(execImmediately);
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// Doing everything that happens normally in onload
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lazyLoader.register();
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});
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afterEach(() => {
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lazyLoader.unregister();
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});
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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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Promise.all([scrollIntoViewPromise(img), waitForAttributeChange(img, ['data-src', 'src'])])
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.then(() => {
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expect(LazyLoader.loadImage).toHaveBeenCalled();
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expect(img.getAttribute('src')).toBe(originalDataSrc);
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expect(img).toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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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 = `${TEST_HOST}/img/testimg.png`;
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newImg.className = 'lazy';
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newImg.setAttribute('data-src', testPath);
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document.body.appendChild(newImg);
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Promise.all([
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scrollIntoViewPromise(newImg),
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waitForAttributeChange(newImg, ['data-src', 'src']),
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])
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.then(() => {
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expect(LazyLoader.loadImage).toHaveBeenCalledWith(newImg);
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expect(newImg.getAttribute('src')).toBe(testPath);
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expect(newImg).toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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});
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it('should not alter normal images', function(done) {
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const newImg = document.createElement('img');
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const testPath = `${TEST_HOST}/img/testimg.png`;
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newImg.setAttribute('src', testPath);
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document.body.appendChild(newImg);
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scrollIntoViewPromise(newImg)
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.then(waitForPromises)
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.then(() => {
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expect(LazyLoader.loadImage).not.toHaveBeenCalledWith(newImg);
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expect(newImg).not.toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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});
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it('should not load dynamically added pictures if content observer is turned off', done => {
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lazyLoader.stopContentObserver();
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const newImg = document.createElement('img');
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const testPath = `${TEST_HOST}/img/testimg.png`;
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newImg.className = 'lazy';
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newImg.setAttribute('data-src', testPath);
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document.body.appendChild(newImg);
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scrollIntoViewPromise(newImg)
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.then(waitForPromises)
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.then(() => {
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expect(LazyLoader.loadImage).not.toHaveBeenCalledWith(newImg);
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expect(newImg).not.toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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});
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it('should load dynamically added pictures if content observer is turned off and on again', done => {
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lazyLoader.stopContentObserver();
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lazyLoader.startContentObserver();
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const newImg = document.createElement('img');
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const testPath = `${TEST_HOST}/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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Promise.all([
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scrollIntoViewPromise(newImg),
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waitForAttributeChange(newImg, ['data-src', 'src']),
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])
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.then(waitForPromises)
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.then(() => {
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expect(LazyLoader.loadImage).toHaveBeenCalledWith(newImg);
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expect(newImg).toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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});
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});
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describe('with IntersectionObserver', () => {
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beforeEach(function() {
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loadFixtures('issues/issue_with_comment.html');
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lazyLoader = new LazyLoader({
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observerNode: 'foobar',
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});
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spyOn(LazyLoader, 'loadImage').and.callThrough();
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spyOn(window, 'requestAnimationFrame').and.callFake(execImmediately);
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spyOn(window, 'requestIdleCallback').and.callFake(execImmediately);
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// Doing everything that happens normally in onload
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lazyLoader.register();
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});
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afterEach(() => {
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lazyLoader.unregister();
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});
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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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Promise.all([scrollIntoViewPromise(img), waitForAttributeChange(img, ['data-src', 'src'])])
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.then(() => {
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expect(LazyLoader.loadImage).toHaveBeenCalledWith(img);
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expect(img.getAttribute('src')).toBe(originalDataSrc);
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expect(img).toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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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 = `${TEST_HOST}/img/testimg.png`;
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newImg.className = 'lazy';
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newImg.setAttribute('data-src', testPath);
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document.body.appendChild(newImg);
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Promise.all([
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scrollIntoViewPromise(newImg),
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waitForAttributeChange(newImg, ['data-src', 'src']),
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])
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.then(() => {
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expect(LazyLoader.loadImage).toHaveBeenCalledWith(newImg);
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expect(newImg.getAttribute('src')).toBe(testPath);
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expect(newImg).toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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});
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it('should not alter normal images', function(done) {
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const newImg = document.createElement('img');
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const testPath = `${TEST_HOST}/img/testimg.png`;
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newImg.setAttribute('src', testPath);
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document.body.appendChild(newImg);
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scrollIntoViewPromise(newImg)
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.then(waitForPromises)
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.then(() => {
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expect(LazyLoader.loadImage).not.toHaveBeenCalledWith(newImg);
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expect(newImg).not.toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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});
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it('should not load dynamically added pictures if content observer is turned off', done => {
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lazyLoader.stopContentObserver();
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const newImg = document.createElement('img');
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const testPath = `${TEST_HOST}/img/testimg.png`;
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newImg.className = 'lazy';
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newImg.setAttribute('data-src', testPath);
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document.body.appendChild(newImg);
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scrollIntoViewPromise(newImg)
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.then(waitForPromises)
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.then(() => {
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expect(LazyLoader.loadImage).not.toHaveBeenCalledWith(newImg);
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expect(newImg).not.toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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});
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it('should load dynamically added pictures if content observer is turned off and on again', done => {
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lazyLoader.stopContentObserver();
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lazyLoader.startContentObserver();
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const newImg = document.createElement('img');
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const testPath = `${TEST_HOST}/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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Promise.all([
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scrollIntoViewPromise(newImg),
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waitForAttributeChange(newImg, ['data-src', 'src']),
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])
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.then(() => {
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expect(LazyLoader.loadImage).toHaveBeenCalledWith(newImg);
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expect(newImg).toHaveClass('js-lazy-loaded');
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done();
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})
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.catch(done.fail);
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});
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});
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});
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