| |
| import React from 'react' |
| import ReactDOMServer from 'react-dom/server' |
| import Image from 'next/image' |
| import cheerio from 'cheerio' |
|
|
| describe('Image rendering', () => { |
| it('should render Image on its own', async () => { |
| const element = React.createElement(Image, { |
| alt: 'a nice image', |
| id: 'unit-image', |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| loading: 'eager', |
| }) |
| const html = ReactDOMServer.renderToString(element) |
| const $ = cheerio.load(html) |
| const img = $('#unit-image') |
| |
| expect(img.attr()).toStrictEqual({ |
| alt: 'a nice image', |
| id: 'unit-image', |
| loading: 'eager', |
| width: '100', |
| height: '100', |
| decoding: 'async', |
| 'data-nimg': '1', |
| style: 'color:transparent', |
| srcset: |
| '/_next/image?url=%2Ftest.png&w=128&q=75 1x, /_next/image?url=%2Ftest.png&w=256&q=75 2x', |
| src: '/_next/image?url=%2Ftest.png&w=256&q=75', |
| }) |
| }) |
|
|
| it('should only render noscript element when lazy loading', async () => { |
| const element = React.createElement(Image, { |
| alt: 'test', |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| loading: 'eager', |
| }) |
| const element2 = React.createElement(Image, { |
| alt: 'test', |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| priority: true, |
| }) |
| const elementLazy = React.createElement(Image, { |
| alt: 'test', |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| }) |
| const $ = cheerio.load(ReactDOMServer.renderToString(element)) |
| const $2 = cheerio.load(ReactDOMServer.renderToString(element2)) |
| const $lazy = cheerio.load(ReactDOMServer.renderToString(elementLazy)) |
| expect($('noscript').length).toBe(0) |
| expect($2('noscript').length).toBe(0) |
| expect($lazy('noscript').length).toBe(0) |
| }) |
|
|
| it('should not render noscript', async () => { |
| const element1 = React.createElement(Image, { |
| alt: 'test', |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| loading: 'eager', |
| placeholder: 'blur', |
| blurDataURL: 'data:image/png;base64', |
| }) |
| const element2 = React.createElement(Image, { |
| alt: 'test', |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| placeholder: 'blur', |
| blurDataURL: 'data:image/png;base64', |
| loading: 'eager', |
| }) |
| const element3 = React.createElement(Image, { |
| alt: 'test', |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| placeholder: 'blur', |
| blurDataURL: 'data:image/png;base64', |
| priority: true, |
| }) |
| const $1 = cheerio.load(ReactDOMServer.renderToString(element1)) |
| const $2 = cheerio.load(ReactDOMServer.renderToString(element2)) |
| const $3 = cheerio.load(ReactDOMServer.renderToString(element3)) |
| expect($1('noscript').length).toBe(0) |
| expect($2('noscript').length).toBe(0) |
| expect($3('noscript').length).toBe(0) |
| }) |
| }) |
|
|
