jest-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({ args: ["--no-sandbox"] });
  // 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());
};