next.js/test/e2e/app-dir/actions-navigation/index.test.ts

import { nextTestSetup } from 'e2e-utils'
import { check, waitFor, retry } from 'next-test-utils'

describe('app-dir action handling', () => {
  const { next } = nextTestSetup({
    files: __dirname,
  })

  it('should handle actions correctly after navigation / redirection events', async () => {
    const browser = await next.browser('/')

    await browser.elementByCss('#middleware-redirect').click()

    expect(await browser.elementByCss('#form').text()).not.toContain(
      'Loading...'
    )

    await browser.elementByCss('#submit').click()

    await check(() => {
      return browser.elementByCss('#form').text()
    }, /Loading.../)

    // wait for 2 seconds, since the action takes a second to resolve
    await waitFor(2000)

    expect(await browser.elementByCss('#form').text()).not.toContain(
      'Loading...'
    )

    expect(await browser.elementByCss('#result').text()).toContain(
      'RESULT FROM SERVER ACTION'
    )
  })

  it('should handle actions correctly after following a relative link', async () => {
    const browser = await next.browser('/nested-folder/products')

    await browser.elementByCss('a').click()

    await browser.elementByCss('#submit').click()

    await retry(async () => {
      expect(await browser.elementById('result').text()).toBe('Added to cart!')
    })
  })
})