Migrate to chromedriver from capybara-webkit for Rails with WSL support

application_system_test_case.rb

require 'test_helper'

# Capybara driver chosen based on the value of ENV['TEST_WITH_CHROME']
# -  `false` - use capybara-webkit
# -  `headless` - chromedriver in headless mode
# -  `true` (or any other value) - chromedriver in a Window
class ApplicationSystemTestCase < ActionDispatch::SystemTestCase

  if ENV['TEST_WITH_CHROME'] && ENV['TEST_WITH_CHROME'] != 'false'
    require "selenium/webdriver"
    require 'chromedriver_patch'
    Capybara.register_driver :chrome do |app|
      capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(
          takesScreenshot: true,
          chromeOptions: { args: ["--window-size=1024,768", "disable-gpu"]}
      )
      Capybara::Selenium::Driver.new(app, browser: :chrome, desired_capabilities: capabilities)
    end
    if ENV['TEST_WITH_CHROME'] == 'headless'
      Capybara.register_driver :headless_chrome do |app|
        capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(
            takesScreenshoot: true,
            chromeOptions: { args: ["--window-size=1024,768", "disable-gpu", "headless"] }
        )
        Capybara::Selenium::Driver.new(app, browser: :chrome, desired_capabilities: capabilities)
      end
      Capybara.javascript_driver = :headless_chrome
      driven_by :headless_chrome
    else
      Capybara.javascript_driver = :chrome
      driven_by :chrome
    end
  else
    require 'capybara/webkit'
    Capybara.javascript_driver = :webkit
    driven_by :webkit
  end

chromedriver

#!/bin/sh
# shim in WSL filesystem to use chromedriver.exe installed in Windows
# place this file in your Linux $PATH and ensure chromedriver.exe is also in your $PATH
chromedriver.exe "$@"

chromedriver_patch.rb

class Capybara::Selenium::Driver

  # monkey patch capybara-webkit method for chromedriver
  def error_messages
    browser.manage.logs.get(:browser)
  end

end

class ChildProcess::Unix::Process
  alias_method :orig_exited?, :exited?

  # monkey patch to support chromedriver on WSL
  def exited?
    return  orig_exited? unless `cat /proc/version` =~ /Microsoft/
    return true if @exit_code
    if (system("pkill -P #{@pid}"))
      @exit_code = 1
      return true
    end
  end
end

@jaxn does this require inside preview to be installed?