main.rb

class Object
	def self.my_attr_accessor variable
		class_eval("def #{variable}= val; @#{variable} = val; end")
		class_eval("def #{variable}; @#{variable}; end")
	end
end

test.rb

require 'attr_accessor'
require 'test/unit'


class A
	my_attr_accessor "points"
end

class AttrAccessorTest < Test::Unit::TestCase
	def test_it_works
		a = A.new
		a.points = 5
		assert_equal 5, a.points
	end
end