next.js/test/development/app-dir/react-performance-track/react-performance-track.test.ts

import { nextTestSetup } from 'e2e-utils'

// Entries are flaky in CI. Without a name and without being able to repro locally,
// it's impossible to fix. Deactivating while we iterate on the track.
// It's still useful as a fixture.
describe('react-performance-track', () => {
  const { next } = nextTestSetup({
    files: __dirname,
  })

  it('should show setTimeout', async () => {
    const browser = await next.browser('/set-timeout')
    await browser.elementByCss('[data-react-server-requests-done]')

    const track = await browser.eval('window.reactServerRequests.getSnapshot()')
    expect(track).toEqual(
      expect.arrayContaining([
        { name: '\u200bsetTimeout', properties: [] },
        { name: '\u200bsetTimeout', properties: [] },
      ])
    )
  })

  it('should show fetch', async () => {
    const browser = await next.browser('/fetch')
    await browser.elementByCss('[data-react-server-requests-done]')

    const track = await browser.eval('window.reactServerRequests.getSnapshot()')
    expect(track).toEqual(
      expect.arrayContaining([
        {
          // React might decide to display the shorthand in round brackets differently.
          // Double check with React changes if a shorthand change is intended.
          name: '\u200bfetch (…/random)',
          properties: expect.arrayContaining([
            ['status', '200'],
            ['url', '"https://next-data-api-endpoint.vercel.app/api/random"'],
          ]),
        },
      ])
    )
  })
})