macros.rb

require 'spec'

module Spec
  module Macros
  end
  class << self
    def define_macros
      Spec::Macros.extend Module.new { yield }
    end
    
    def define_macro name, &block
      define_macros do
        self.class.module_eval do
          define_method name, &block
        end
      end
    end
  end
end

class Spec::Example::ExampleGroup
  extend Spec::Macros
end