Headless Chrome Karma configuration for NodeJS Dev Docker

karma.conf.js

// 1) from the terminal, install latest version of karma-chrome-launcher and puppeteer (yarn or npm)
// $ yarn add karma-chrome-launcher puppeteer --dev

// 2) in your Karam config
// https://github.com/karma-runner/karma-chrome-launcher#headless-chromium-with-puppeteer
process.env.CHROME_BIN = require('puppeteer').executablePath();

const config = {
  // start of your config
  // ...
  
  // https://github.com/Googlechrome/puppeteer/issues/290#issuecomment-322852784
  browsers: ['CustomChromeHeadless'],
    customLaunchers: {
    CustomChromeHeadless: {
      base: 'ChromeHeadless',
      flags: ['--no-sandbox', '--disable-setuid-sandbox'] 
    }
  },
  
  // https://github.com/jasmine/jasmine/issues/1413#issuecomment-334247097
  captureTimeout: 210000, 
  browserDisconnectTolerance: 3,
  browserDisconnectTimeout: 210000,
  browserNoActivityTimeout: 210000,
  
  // rest of your config
  // ...
}