Test local Chrome extensions with Jest and Puppeteer

jest-puppeteer.config.js

// install dependencies first:
// $ yarn add jest jest-puppeteer puppeteer -D

const path = require('path')

const CRX_PATH = path.resolve(__dirname, 'path/to/local/extension/dir')

module.exports = {
  launch: {
    headless: false, // required for loading extensions
    args: [
      `--disable-extensions-except=${CRX_PATH}`,
      `--load-extension=${CRX_PATH}`
    ],
  },
}

jest.config.js

module.exports = {
  preset: 'jest-puppeteer',
  // Note: no testEnvironment
}