setup.js

const chalk = require('chalk')
const puppeteer = require('puppeteer')
const fs = require('fs')
const mkdirp = require('mkdirp')
const os = require('os')
const path = require('path')

const DIR = path.join(os.tmpdir(), 'jest_puppeteer_global_setup')

module.exports = async function() {
  console.log(chalk.green('Setup Puppeteer'))
  const browser = await puppeteer.launch({ headless: false })
  // This global is not available inside tests but only in global teardown  
  global.__BROWSER_GLOBAL__ = browser
  // Instead, we expose the connection details via file system to be used in tests
  mkdirp.sync(DIR)
  fs.writeFileSync(path.join(DIR, 'wsEndpoint'), browser.wsEndpoint())

  // ------
  let hmm = [
    'https://www.youtube.com/watch?v=dQw4w9WgXcQ',
  ]
  page = await browser.newPage()
  await page.goto(hmm[0]);
}