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next.js/test/e2e/app-dir/app/useReportWebVitals.test.ts
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first commit
2026-03-10 19:37:31 +03:30

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TypeScript

import { createNext } from 'e2e-utils'
import { NextInstance } from 'e2e-utils'
import { check } from 'next-test-utils'
describe('useReportWebVitals hook', () => {
let next: NextInstance
beforeAll(async () => {
next = await createNext({
files: __dirname,
skipStart: true,
env: {},
dependencies: {
nanoid: '4.0.1',
},
})
await next.start()
})
afterAll(() => next.destroy())
// Analytics events are only sent in production
it('should send web-vitals', async () => {
await next.fetch('/report-web-vitals')
let eventsCount = 0
const browser = await next.browser('/report-web-vitals', {
beforePageLoad: (page) => {
page.route('https://example.vercel.sh/vitals', (route) => {
eventsCount += 1
route.fulfill()
})
},
})
// Refresh will trigger CLS and LCP. When page loads FCP and TTFB will trigger:
await browser.refresh()
// After interaction LCP and FID will trigger
await browser.elementById('btn').click()
// Make sure all registered events in performance-relayer has fired
await check(async () => {
expect(eventsCount).toBeGreaterThanOrEqual(6)
return 'success'
}, 'success')
})
})