stories_helper.rb

# inside class Protest::TestCase

  class << self
    alias original_scenario scenario

    def scenario(name, options = {}, &block)
      original_scenario(name) do
        old_driver, Capybara.current_driver = Capybara.current_driver, options[:driver] || Capybara.current_driver

        instance_eval(&block)

        Capybara.current_driver = old_driver
      end
    end
  end