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hmr.js
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/
hmr.js
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/* eslint-env jest */
import webdriver from 'next-webdriver'
import { readFileSync, writeFileSync } from 'fs'
import { join } from 'path'
import { waitFor } from 'next-test-utils'
export default (context, renderViaHTTP) => {
describe('Hot Module Reloading', () => {
it('should reload typescript file without refresh', async () => {
let browser
const pagePath = join(__dirname, '../', 'pages', 'hmr', 'some-page.tsx')
const originalContent = readFileSync(pagePath, 'utf8')
const editedContent = originalContent.replace('Increment', 'INCREMENT')
try {
browser = await webdriver(context.appPort, '/hmr/some-page')
const randomNumber = await browser.eval('window.HMR_RANDOM_NUMBER')
const originalButtonText = await browser.elementByCss('button').text()
expect(originalButtonText).toBe('Increment')
// Change the about.js page
writeFileSync(pagePath, editedContent, 'utf8')
// wait for 5 seconds
await waitFor(5000)
const randomNumberAfterEdit = await browser.eval(
'window.HMR_RANDOM_NUMBER'
)
expect(randomNumberAfterEdit).toBe(randomNumber)
const updatedButtonText = await browser.elementByCss('button').text()
expect(updatedButtonText).toBe('INCREMENT')
} finally {
// restore the about page content.
writeFileSync(pagePath, originalContent, 'utf8')
if (browser) {
await browser.close()
}
}
})
})
}