dm-machinist
DataMapper plugin for Pete Yandell’s(notahat.com/) excellent Machinist library.
gem ‘snepo-dm-machinist require ’dm-machinist’ in your spec_helper.rb and you can use it in your specs.
See Tim Lucus’s sweet write up for usage details on Machinist. toolmantim.com/article/2008/10/27/fixtureless_datas_with_machinist_and_sham