Playing with modules. Is it correct?

modules.rb

require "sinatra/base"

module BoldTypes
  module Authentication
    def self.registered(app)
      app.helpers BoldTypes::Helpers::Authentication
      app.get "/" do
        "#{testing}"
      end
    end
  end
	
  module Helpers
    module Authentication
      def testing
        "Something Else"
      end
    end
  end
	
  class Application < Sinatra::Base
    register BoldTypes::Authentication
  end
end

BoldTypes::Application.run!