Use Sinatra to open a browser window (and close Sinatra when the window closes)

apprunner.rb

%w[sinatra watir-webdriver].each { |gem| require gem }

class MyApp < Sinatra::Base
  get('/') { "hello world" }
end


class AppRunner

  def initialize    
    @browser = nil
  end

  def browser_start!
    @browser = Watir::Browser.start 'http://localhost:4567'
  end

  def start!
    Thread.new { sleep(1) until MyApp.settings.running?; browser_start! }
    Thread.new { check_browser while true }
    MyApp.run!
  end

  def check_browser
    sleep(1)
    begin
      @browser.status unless @browser.nil?
    rescue Exception
      puts "== Sinatra has been led off the stage by AppRunner..."
      exit(0)
    end
  end

end

AppRunner.new.start!