File size: 3,033 Bytes
1e92f2d |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 |
/* eslint-env jest */
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'
)
})
})
|