next.js/test/development/next-font/build-errors.test.ts

import { createNext, FileRef } from 'e2e-utils'
import { NextInstance } from 'e2e-utils'
import { join } from 'path'
import webdriver from 'next-webdriver'
import { getRedboxSource, hasRedbox } from 'next-test-utils'

// TODO: The error overlay is not closed when restoring the working code.
describe.skip('next/font build-errors', () => {
  let next: NextInstance

  beforeAll(async () => {
    next = await createNext({
      files: new FileRef(join(__dirname, 'build-errors')),
    })
  })
  afterAll(() => next.destroy())

  it('should show a next/font error when input is wrong', async () => {
    const browser = await webdriver(next.url, '/')
    const content = await next.readFile('app/page.js')

    await next.patchFile(
      'app/page.js',
      `
import localFont from 'next/font/local'

const font = localFont()

export default function Page() {
  return <p className={font.className}>Hello world!</p>
}
`
    )

    expect(await hasRedbox(browser)).toBeTrue()
    expect(await getRedboxSource(browser)).toMatchInlineSnapshot(`
      "app/page.js
      \`next/font\` error:
      Missing required \`src\` property"
    `)

    await next.patchFile('app/page.js', content)
    expect(await hasRedbox(browser)).toBeFalse()
  })

  it("should show a module not found error if local font file can' be resolved", async () => {
    const browser = await webdriver(next.url, '/')
    const content = await next.readFile('app/page.js')

    await next.patchFile(
      'app/page.js',
      `
import localFont from 'next/font/local'

const font = localFont({ src: './boom.woff2'})

export default function Page() {
  return <p className={font.className}>Hello world!</p>
}
`
    )

    expect(await hasRedbox(browser)).toBeTrue()
    const sourceLines = (await getRedboxSource(browser)).split('\n')

    // Should display the file name correctly
    expect(sourceLines[0]).toEqual('app/page.js')
    // Should be module not found error
    expect(sourceLines[1]).toEqual(
      "Module not found: Can't resolve './boom.woff2'"
    )

    await next.patchFile('app/page.js', content)
    expect(await hasRedbox(browser)).toBeFalse()
  })
})