<test lang="jest"> template loader for Vue SFC

jest-loader.js

const fs = require('fs')
const loaderUtils = require('loader-utils')
const path = require('path')

module.exports = function (source) {
  const options = loaderUtils.getOptions(this)

  const filename = path.parse(this.resourcePath).name

  const extension = (options && options.extension) || '_jest.spec.js'
  const dir = `${this.context}/__tests__`
  console.log(`Created test file: ${filename}`)
  if (!fs.existsSync(dir)){
    fs.mkdirSync(dir);
  }
  const code = source.replace(/\n{2,}/, '')
  const dest = `${dir}/${filename}${extension}`
  fs.writeFileSync(dest, code)
  return `<!-- Created test file: ${filename} -->`
}

webpack chain

chain.module.rule('jest')
  .test(/\.jest$/)
  .use('jest')
    .loader(require.resolve('./test/loaders/jest-loader.js'))
chain.module.rule('webdriver')
  .test(/\.webdriver$/)
  .use('webdriver')
    .loader(require.resolve('./test/loaders/webdriver-loader.js'))