как запустить автономный тест Capybara?

I'm trying to run a test against a remote server. i.e:

require 'rubygems'
require 'capybara'
require 'capybara/dsl'

Capybara.default_driver = :selenium
Capybara.app_host = 'http://www.google.com'


module MyCapybaraTest
  include Capybara

  def test_google
    visit('/')
  end
end

question is, how do you run it?