Add sibling AS to load path for testing to ensure gems aren't used

activeresource/Rakefile

@@ -28,6 +28,8 @@ task :default => [ :test ]
 # Run the unit tests
 
 Rake::TestTask.new { |t|
+  activesupport_path = "#{File.dirname(__FILE__)}/../activesupport/lib"
+  t.libs << activesupport_path if File.directory?(activesupport_path)
   t.libs << "test"
   t.pattern = 'test/**/*_test.rb'
   t.verbose = true