run_chrome_in_docker.rb

require 'bundler/inline'

def binary_found?(name)
  `which #{name}`
  $?.success?
end

def check_binary(name)
  return if binary_found?(name)
  puts "Missing binary: #{name}"
  exit
end

gemfile do
  source 'https://rubygems.org'
  gem 'selenium-webdriver'
  gem 'pry'
  gem 'pry-byebug'
  gem 'rspec-expectations'
end

check_binary('chromedriver')
check_binary('scrot')

puts 'Latest: selenium/chrome-standalone-debug'

begin
  include RSpec::Matchers

  driver = Selenium::WebDriver.for(
    :remote,
    url: 'http://localhost:4444/wd/hub',
    desired_capabilities: Selenium::WebDriver::Remote::Capabilities.chrome(
      chromeOptions: {
        args: %w[--start-maximized --disable-translate]
      }
    )
  )
  driver.navigate.to "http://#{IPSocket.getaddress(Socket.gethostname)}:3030"

  draggable = driver.find_element(id: '1')
  droppable = driver.find_element(id: '2')

  # Take a screenshot before
  system('vncviewer -config config.vnc & sleep 5 && scrot -u run_chrome_in_docker_before.jpg; killall vncviewer')

  # Perform drag drop
  driver.action.drag_and_drop(draggable, droppable).perform

  # Take a screenshot after
  system('vncviewer -config config.vnc & sleep 5 && scrot -u run_chrome_in_docker_after.jpg; killall vncviewer')

  # Inspect page text
  page_text = driver.execute_script('return document.body').text
  expect(page_text).to eq("Element Two\nElement One")
rescue RSpec::Expectations::ExpectationNotMetError => e
  puts e.message
ensure
  driver && driver.quit
end