next.js/test/e2e/app-dir/app-root-params/simple.test.ts

import { nextTestSetup } from 'e2e-utils'
import { assertNoRedbox } from 'next-test-utils'
import { join } from 'path'

describe('app-root-params - simple', () => {
  const { next, isNextDeploy, isTurbopack } = nextTestSetup({
    files: join(__dirname, 'fixtures', 'simple'),
  })

  it('should return rootParams', async () => {
    const $ = await next.render$('/en/us')
    expect($('p').text()).toBe('hello world {"lang":"en","locale":"us"}')
  })

  it('should only return rootParams and not other params', async () => {
    const $ = await next.render$('/en/us/other/1')
    expect($('#dynamic-params').text()).toBe('1')
    expect($('#root-params').text()).toBe('{"lang":"en","locale":"us"}')
  })

  it('should render the not found page without errors', async () => {
    const browser = await next.browser('/')
    expect(await browser.elementByCss('h2').text()).toBe(
      'This page could not be found.'
    )
    await assertNoRedbox(browser)
  })

  // `next-types-plugin` currently only runs in Webpack.
  // We skip deployment mode since we don't care about the deploy, we just want to
  // check the file generated at build time.
  if (!isNextDeploy && !isTurbopack) {
    it('should correctly generate types', async () => {
      expect(await next.hasFile('.next/types/server.d.ts')).toBe(true)
      const fileContents = await next.readFile('.next/types/server.d.ts')
      expect(fileContents).toContain(
        `export function unstable_rootParams(): Promise<{ lang: string, locale: string }>`
      )
    })
  }
})