Cleaning up railties tests. Set RAILS_ROOT for Rails::Initializer if undefined.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4842 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/CHANGELOG

 *SVN*
 
+* Cleaning up railties tests. [Kevin Clark]
+
 * Add Dependencies.load_once_paths. [Nicholas Seckar]
 
 * Updated to script.aculo.us 1.6.2 [Thomas Fuchs]

railties/test/plugin_test.rb

@@ -5,6 +5,14 @@
 require 'active_support'
 require 'initializer'
 
+unless defined?(RAILS_ROOT)
+  module Rails
+    class Initializer
+      RAILS_ROOT = '.'
+    end
+  end
+end
+
 class PluginTest < Test::Unit::TestCase
   class TestConfig < Rails::Configuration
     protected