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import { Server } from 'http'
import {
findPort,
nextBuild,
startStaticServer,
stopApp,
} from 'next-test-utils'
import webdriver from 'next-webdriver'
import { join } from 'path'
const itHeaded = process.env.HEADLESS ? it.skip : it
describe('bfcache-routing', () => {
let port: number
let app: Server
beforeAll(async () => {
const appDir = __dirname
const exportDir = join(appDir, 'out')
await nextBuild(appDir, undefined, { cwd: appDir })
port = await findPort()
app = await startStaticServer(exportDir, undefined, port)
})
afterAll(() => {
stopApp(app)
})
itHeaded(
'should not suspend indefinitely when page is restored from bfcache after an mpa navigation',
async () => {
// bfcache is not currently supported by CDP, so we need to run this particular test in headed mode
// https://bugs.chromium.org/p/chromium/issues/detail?id=1317959
const browser = await webdriver(port, '/index.html', { headless: false })
// we overwrite the typical waitUntil: 'load' option here as the event is never being triggered if we hit the bfcache
const bfOptions = { waitUntil: 'commit' as const }
await browser.elementByCss('a[href="https://example.vercel.sh"]').click()
await browser.waitForCondition(
'window.location.origin === "https://example.vercel.sh"'
)
await browser.back(bfOptions)
await browser.waitForCondition(
'window.location.origin.includes("localhost")'
)
let html = await browser.eval<string>(
'document.documentElement.innerHTML'
)
expect(html).toContain('BFCache Test')
await browser.eval(`document.querySelector('button').click()`)
// we should still be on the test page
html = await browser.eval<string>('document.documentElement.innerHTML')
expect(html).toContain('BFCache Test')
await browser.forward(bfOptions)
await browser.back(bfOptions)
await browser.waitForCondition(
'window.location.origin.includes("localhost")'
)
// we should be back on the test page with no errors
html = await browser.eval<string>('document.documentElement.innerHTML')
expect(html).toContain('BFCache Test')
// After restoring from bfcache, a subsequent mpa navigation to the same URL should work
// We trigger the click via `eval` because when restoring from bfcache, our internal
// 'waitForElementByCss' method doesn't think the element is attached to the DOM.
await browser.eval(
`document.querySelector('a[href="https://example.vercel.sh"]').click()`
)
await browser.waitForCondition(
'window.location.origin === "https://example.vercel.sh"'
)
}
)
})
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