simpler extension to newman applications

gistfile1.rb

module Newman
  module ActAsPingPong
    def self.extended(klass)
      klass.instance_eval do
        to(:tag, "ping") do
          respond(:subject => "pong")
        end
      end
    end
  end
end
module Newman
  module Examples

    SimpleList = Newman::Application.new do

      extend ActAsPingPong

      # ... 
    end
  end
end

describe "SimpleList" do
  it "could be extended by PingPongApplication" do
    mailer.deliver_message(:to => "[email protected]")
    server.tick(Newman::Examples::SimpleList)
    messages = mailer.messages
    messages.first.subject.must_equal("pong")
  end
end