Script to reproduce the chromedriver process not stopping for https://github.com/vvo/selenium-standalone/issues/351

selenium.test.js

const selenium = require('selenium-standalone')
const webdriverio = require('webdriverio')

const configuration = {
  version: '3.8.1',
  baseURL: 'http://selenium-release.storage.googleapis.com',
  drivers: {
    chrome: {
      version: '2.37',
      arch: process.arch,
      baseURL: 'https://chromedriver.storage.googleapis.com'
    }
  }
}

let child
let client

install()
  .then(start)
  // commenting out the following two lines does not leave the chromedriver
  // process running after stopping the selenium process
  .then(initialize)
  .then(uninitialize)
  .then(stop)

function install () {
  return new Promise(function (resolve, reject) {
    console.log('Installing Selenium server.')
    selenium.install(configuration, function (error) {
      if (error) {
        reject(error)
      } else {
        console.log('Installed Selenium server.')
        resolve()
      }
    })
  })
}

function start () {
  return new Promise(function (resolve, reject) {
    console.log('Starting Selenium server.')
    selenium.start(configuration, function (error, selenium) {
      if (error) {
        reject(error)
      } else {
        child = selenium
        console.log('Started Selenium server: ' + child.pid + '.')
        resolve()
      }
    })
  })
}

function initialize () {
  console.log('Connecting to the browser driver.')
  client = webdriverio.remote({
    desiredCapabilities: {
      browserName: 'chrome',
      chromeOptions: {
        args: ['--headless']
      }
    }
  })
  return client.init()
}

function uninitialize () {
  console.log('Disconnecting from the browser driver.')
  return client.end()
  // removing the comment from the following line and letting it perform
  // stops the chromedriver process too after stopping the selenium process
  // .pause(100)
}

function stop () {
  console.log('Stopping Selenium server: ' + child.pid + '.')
  child.kill()
}

selenium.test.txt

$ DEBUG=selenium-standalone:* node selenium.test.js.txt
  selenium-standalone:env-details Platform: linux 4.15.0-12-generic +0ms
  selenium-standalone:env-details Architecture: x64 +2ms
  selenium-standalone:env-details Node.js: v8.10.0 +0ms
  selenium-standalone:env-details CWD: /home/user/test/test +0ms
  selenium-standalone:env-details Module Path: /home/user/test/node_modules/selenium-standalone/lib +0ms
  selenium-standalone:env-details Package Version: 6.13.0 +1ms
Installing Selenium server.
  selenium-standalone:install Install API called with { version: '3.8.1',
  baseURL: 'http://selenium-release.storage.googleapis.com',
  drivers: 
   { chrome: 
      { version: '2.37',
        arch: 'x64',
        baseURL: 'https://chromedriver.storage.googleapis.com' } } } +0ms
  selenium-standalone:install setDriverFilePermissions /home/user/test/node_modules/selenium-standalone/.selenium/chromedriver/2.37-x64-chromedriver +308ms
  selenium-standalone:install /home/user/test/node_modules/selenium-standalone/.selenium/chromedriver/2.37-x64-chromedriver stats : Stats {
  selenium-standalone:install   dev: 2050,
  selenium-standalone:install   mode: 33261,
  selenium-standalone:install   nlink: 1,
  selenium-standalone:install   uid: 1000,
  selenium-standalone:install   gid: 1000,
  selenium-standalone:install   rdev: 0,
  selenium-standalone:install   blksize: 4096,
  selenium-standalone:install   ino: 12644415,
  selenium-standalone:install   size: 7874704,
  selenium-standalone:install   blocks: 15384,
  selenium-standalone:install   atimeMs: 1521628499027.0286,
  selenium-standalone:install   mtimeMs: 1521628499107.028,
  selenium-standalone:install   ctimeMs: 1521631468523.9392,
  selenium-standalone:install   birthtimeMs: 1521631468523.9392,
  selenium-standalone:install   atime: 2018-03-21T10:34:59.027Z,
  selenium-standalone:install   mtime: 2018-03-21T10:34:59.107Z,
  selenium-standalone:install   ctime: 2018-03-21T11:24:28.524Z,
  selenium-standalone:install   birthtime: 2018-03-21T11:24:28.524Z } +1ms
Installed Selenium server.
Starting Selenium server.
  selenium-standalone:start Start API called with { version: '3.8.1',
  baseURL: 'http://selenium-release.storage.googleapis.com',
  drivers: 
   { chrome: 
      { version: '2.37',
        arch: 'x64',
        baseURL: 'https://chromedriver.storage.googleapis.com' } },
  progressCb: [Function: noop] } +0ms
  selenium-standalone:start Spawning Selenium Server process /usr/bin/java [ '-Dwebdriver.chrome.driver=/home/user/test/node_modules/selenium-standalone/.selenium/chromedriver/2.37-x64-chromedriver',
  '-jar',
  '/home/user/test/node_modules/selenium-standalone/.selenium/selenium-server/3.8.1-server.jar' ] +5ms
Started Selenium server: 9579.
Connecting to the browser driver.
Disconnecting from the browser driver.
Stopping Selenium server: 9579.