wagtail/client/tests/integration/teardown.js

const fs = require('fs').promises;
const os = require('os');
const path = require('path');

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

module.exports = async () => {
  // close the browser instance
  await global.__BROWSER_GLOBAL__.close();

  // clean-up the wsEndpoint file
  await fs.rm(DIR, { recursive: true, force: true });
};