| |
| import React from 'react' |
| import ReactDOM from 'react-dom/server' |
| import Image from 'next/legacy/image' |
| import cheerio from 'cheerio' |
|
|
| describe('Image Legacy Rendering', () => { |
| it('should render Image on its own', async () => { |
| const element = React.createElement(Image, { |
| id: 'unit-image', |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| loading: 'eager', |
| }) |
| const html = ReactDOM.renderToString(element) |
| const $ = cheerio.load(html) |
| const img = $('#unit-image') |
| expect(img.attr('id')).toBe('unit-image') |
| expect(img.attr('src')).toContain('test.png') |
| expect(img.attr('srcset')).toContain('test.png') |
| }) |
|
|
| it('should only render noscript element when lazy loading', async () => { |
| const element = React.createElement(Image, { |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| loading: 'eager', |
| }) |
| const element2 = React.createElement(Image, { |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| priority: true, |
| }) |
| const elementLazy = React.createElement(Image, { |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| }) |
| const $ = cheerio.load(ReactDOM.renderToString(element)) |
| const $2 = cheerio.load(ReactDOM.renderToString(element2)) |
| const $lazy = cheerio.load(ReactDOM.renderToString(elementLazy)) |
| expect($('noscript').length).toBe(0) |
| expect($2('noscript').length).toBe(0) |
| expect($lazy('noscript').length).toBe(1) |
| }) |
|
|
| it('should render noscript element when placeholder=blur', async () => { |
| const element1 = React.createElement(Image, { |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| loading: 'eager', |
| placeholder: 'blur', |
| blurDataURL: 'data:image/png;base64', |
| }) |
| const element2 = React.createElement(Image, { |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| placeholder: 'blur', |
| blurDataURL: 'data:image/png;base64', |
| loading: 'eager', |
| }) |
| const element3 = React.createElement(Image, { |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| placeholder: 'blur', |
| blurDataURL: 'data:image/png;base64', |
| priority: true, |
| }) |
| const $1 = cheerio.load(ReactDOM.renderToString(element1)) |
| const $2 = cheerio.load(ReactDOM.renderToString(element2)) |
| const $3 = cheerio.load(ReactDOM.renderToString(element3)) |
| expect($1('noscript').length).toBe(1) |
| expect($2('noscript').length).toBe(1) |
| expect($3('noscript').length).toBe(1) |
| }) |
|
|
| it('should render the correct sizes passed when a noscript element is rendered', async () => { |
| const element = React.createElement(Image, { |
| src: '/test.png', |
| width: 100, |
| height: 100, |
| sizes: '50vw', |
| }) |
| const $ = cheerio.load(ReactDOM.renderToString(element)) |
| const noscriptImg = $('noscript img') |
| expect(noscriptImg.attr('sizes')).toBe('50vw') |
| expect(noscriptImg.attr('srcset')).toContain( |
| '/_next/image?url=%2Ftest.png&w=384&q=75 384w' |
| ) |
| }) |
| }) |
|
|
