Nuxt/test/unit/extract-css.test.js

import { resolve } from 'path'
import fs from 'fs'
import { promisify } from 'util'
import { loadFixture, getPort, Nuxt } from '../utils'

let nuxt = null
const readFile = promisify(fs.readFile)
const isWindows = process.platform.startsWith('win')

describe('extract css', () => {
  beforeAll(async () => {
    const options = await loadFixture('extract-css')
    nuxt = new Nuxt(options)
    await nuxt.ready()

    await nuxt.server.listen(await getPort(), '0.0.0.0')
  })

  test('Verify global.css has been extracted and minified', async () => {
    const fileName = isWindows ? 'pages_index.css' : 'pages/index.css'
    const extractedIndexCss = resolve(__dirname, '..', 'fixtures/extract-css/.nuxt/dist/client', fileName)
    const content = await readFile(extractedIndexCss, 'utf-8')

    const scopeCss = /^h1\[data-v-[a-zA-Z0-9]{8}\]\{color:red\}\.container\[data-v-[a-zA-Z0-9]{8}\]/
    expect(content).toMatch(scopeCss)

    const containerStyle = '{display:-ms-grid;display:grid;-ms-grid-columns:60px 60px 60px 60px 60px;grid-template-columns:60px 60px 60px 60px 60px;-ms-grid-rows:30px 30px;grid-template-rows:30px 30px;grid-auto-flow:row}'
    expect(content).toContain(containerStyle)
  })

  test('/about should contain module style', async () => {
    const { html } = await nuxt.server.renderRoute('/about')
    expect(html).toMatch(/<h1 class="test_[a-zA-Z0-9]{5}">\s*I'm BLUE\s*<\/h1>/)
    // no duplicate inlined style
    expect(html).not.toContain('{color:#00f}')
  })
})