The gist of my problem is as follows:-

I'm writing a Mocha mock in Ruby for the method represented as "post_to_embassy" below. It is not really our concern, for the purpose of describing the problem, what the actual method does. But I need the mock to return a dynamic value. The proc '&prc' below is executing rightly in place of the actual method. But the "with" method in Mocha only allows for boolean values to be returned. So the code below outputs nil. I need it to output the value being passed through orderInfoXml. Does anyone know of an alternate method I can use?

require 'rubygems'
require 'mocha'
include Mocha::API

class EmbassyInterface 
  def post_to_embassy(xml)
    puts "This is from the original class:-"
    puts xml
    return xml
  end
end

orderInfoXml = "I am THE XML"

mock = EmbassyInterface.new
prc = Proc.new do |orderXml| 
  puts "This is from the mocked proc:-"
  puts orderXml
  orderXml
end

mock.stubs(:post_to_embassy).with(&prc)
mock_result = mock.post_to_embassy(orderInfoXml)
p mock_result
#p prc.call("asd")

output:-

This is from the mocked proc:-
I am THE XML
nil