Just use abstract_unit

railties/test/rails_info_test.rb

-$:.unshift File.dirname(__FILE__) + "/../lib"
-$:.unshift File.dirname(__FILE__) + "/../builtin/rails_info"
-$:.unshift File.dirname(__FILE__) + "/../../activesupport/lib"
-$:.unshift File.dirname(__FILE__) + "/../../actionpack/lib"
-
-require 'rubygems'
-gem 'rack', '~> 1.0.0'
-
-require 'test/unit'
-require 'active_support'
-require 'active_support/test_case'
-require 'action_controller'
+require 'abstract_unit'
 
 unless defined?(Rails) && defined?(Rails::Info)
   module Rails