attr.rb

class ClassWithAttr
  def self.my_attr_accessor(attr_name)
    define_method("#{attr_name.to_s}=") do |arg|
       instance_variable_set("@#{attr_name}", arg)
    end
    define_method("#{attr_name.to_s}") do 
       instance_variable_get("@#{attr_name}")
    end
  end
 
  my_attr_accessor :name
end



if __FILE__ == $PROGRAM_NAME
  require "test/unit"
  require 'rubygems'
  require 'mocha'

  class AttrTest < Test::Unit::TestCase

    def test_my_attr_accessor
      person = ClassWithAttr.new
      person.name = "Dan"
      assert_equal "Dan", person.name
    end

  end
end