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import { retry } from 'next-test-utils'
import { nextTestSetup } from 'e2e-utils'
describe('Document and App - Rendering via HTTP', () => {
const { next, isNextDev } = nextTestSetup({
files: __dirname,
})
describe('_document', () => {
it('should include required elements in rendered html', async () => {
const $ = await next.render$('/')
// It has a custom html class
expect($('html').hasClass('test-html-props')).toBe(true)
// It has a custom body class
expect($('body').hasClass('custom_class')).toBe(true)
// It injects custom head tags
expect($('head').text()).toMatch('body { margin: 0 }')
// It has __NEXT_DATA__ script tag
expect($('script#__NEXT_DATA__')).toBeTruthy()
// It passes props from Document.getInitialProps to Document
expect($('#custom-property').text()).toBe('Hello Document')
})
it('Document.getInitialProps returns html prop representing app shell', async () => {
// Extract css-in-js-class from the rendered HTML, which is returned by Document.getInitialProps
const $index = await next.render$('/')
const $about = await next.render$('/about')
expect($index('#css-in-cjs-count').text()).toBe('2')
expect($about('#css-in-cjs-count').text()).toBe('0')
})
it('adds nonces to all scripts and preload links', async () => {
const $ = await next.render$('/')
const nonce = 'test-nonce'
let noncesAdded = true
$('script, link[rel=preload]').each((index, element) => {
if ($(element).attr('nonce') !== nonce) noncesAdded = false
})
expect(noncesAdded).toBe(true)
})
it('adds crossOrigin to all scripts and preload links', async () => {
const $ = await next.render$('/')
const crossOrigin = 'anonymous'
$('script, link[rel=preload]').each((index, element) => {
expect($(element).attr('crossorigin') === crossOrigin).toBeTruthy()
})
})
it('renders ctx.renderPage with enhancer correctly', async () => {
const $ = await next.render$('/?withEnhancer=true')
const nonce = 'RENDERED'
expect($('#render-page-enhance-component').text().includes(nonce)).toBe(
true
)
})
it('renders ctx.renderPage with enhanceComponent correctly', async () => {
const $ = await next.render$('/?withEnhanceComponent=true')
const nonce = 'RENDERED'
expect($('#render-page-enhance-component').text().includes(nonce)).toBe(
true
)
})
it('renders ctx.renderPage with enhanceApp correctly', async () => {
const $ = await next.render$('/?withEnhanceApp=true')
const nonce = 'RENDERED'
expect($('#render-page-enhance-app').text().includes(nonce)).toBe(true)
})
it('renders ctx.renderPage with enhanceApp and enhanceComponent correctly', async () => {
const $ = await next.render$(
'/?withEnhanceComponent=true&withEnhanceApp=true'
)
const nonce = 'RENDERED'
expect($('#render-page-enhance-app').text().includes(nonce)).toBe(true)
expect($('#render-page-enhance-component').text().includes(nonce)).toBe(
true
)
})
if (isNextDev) {
// This is a workaround to fix https://github.com/vercel/next.js/issues/5860
// TODO: remove this workaround when https://bugs.webkit.org/show_bug.cgi?id=187726 is fixed.
it('adds a timestamp to link tags with preload attribute to invalidate the cache in dev', async () => {
const $ = await next.render$('/', undefined, {
headers: { 'user-agent': 'Safari' },
})
$('link[rel=preload]').each((index, element) => {
const href = $(element).attr('href')
expect(href.match(/\?/g)).toHaveLength(1)
expect(href).toMatch(/\?ts=/)
})
$('script[src]').each((index, element) => {
const src = $(element).attr('src')
expect(src.match(/\?/g)).toHaveLength(1)
expect(src).toMatch(/\?ts=/)
})
})
}
})
describe('_app', () => {
it('shows a custom tag', async () => {
const $ = await next.render$('/')
expect($('#hello-app').text()).toBe('Hello App')
})
// For example react context uses shared module state
// Also known as singleton modules
it('should share module state with pages', async () => {
const $ = await next.render$('/shared')
expect($('#currentstate').text()).toBe('UPDATED')
})
if (isNextDev) {
it('should show valid error when thrown in _app getInitialProps', async () => {
const errMsg = 'have an error from _app getInitialProps'
const origContent = await next.readFile('pages/_app.js')
expect(await next.render('/')).toContain('page-index')
await next.patchFile(
'pages/_app.js',
origContent.replace(
'// throw _app GIP err here',
`throw new Error("${errMsg}")`
)
)
let foundErr = false
try {
await retry(async () =>
expect(await next.render('/')).toContain(errMsg)
)
foundErr = true
} finally {
await next.patchFile('pages/_app.js', origContent)
// Make sure _app is restored
await retry(async () =>
expect(await next.render('/')).toContain('page-index')
)
expect(foundErr).toBeTruthy()
}
})
}
})
})
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