Vitalie Cherpec

 require "capybara/dsl"
 require "capybara/poltergeist"
 
 class Screenshot
   include Capybara::DSL
 
   # Captures a screenshot of +url+ saving it to +path+.
   def capture(url, path)
     # Browser settings
    page.driver.resize(1024, 768)
    page.driver.headers = {
      "User-Agent" => "Webshot 1.0",
    }

    # Open page
    visit url

    if page.driver.status_code == 200
      # Save screenshot
      page.driver.save_screenshot(path, :full => true)

      # Resize image
      # ...
    else
      # Handle error
    end
  end
end

# By default Capybara will try to boot a rack application
# automatically. You might want to switch off Capybara's
# rack server if you are running against a remote application
Capybara.run_server = false
Capybara.register_driver :poltergeist do |app|
  Capybara::Poltergeist::Driver.new(app, {
    # Raise JavaScript errors to Ruby
    js_errors: false,
    # Additional command line options for PhantomJS
    phantomjs_options: ['--ignore-ssl-errors=yes'],
  })
end
Capybara.current_driver = :poltergeist

screenshot = Screenshot.new
screenshot.capture "http://www.google.com/", "output.png"

# Setup Capybara
Webshot.capybara_setup!

# Take a screenshot of Google's home page
# and save it to a image file using png format
webshot = Webshot::Screenshot.new
webshot.capture "http://www.google.com/", "google.png"

class Hello
  def say
    puts "Hello, world!"
  end
end

hello = Hello.new
hello.say