gistfile1.rb

def pop(opts={})
      queue.pop(opts) do |header,payload|
        donkey.process(header,Donkey::Message.decode(payload))
      end
end


# Public#pop
    it "pops a message" do
      header = "header"
      payload = "payload"
      queue = Object.new
      class << queue
        attr_reader :captured_block
        def pop(opts,&block)
          @captured_block = block
        end
      end
      # mocks the object we are testing to return the queue double
      mock(@public).queue { queue }
      
      mock(Donkey::Message).decode(payload) { "message" }
      mock(@donkey).process(header,"message")
      @public.pop
      # tests the call back
      queue.captured_block.call(header,payload)
    end
  end