Make sure we don't run linked Rails tests.

Rakefile

@@ -19,7 +19,9 @@ require 'rake/testtask'
 
 Rake::TestTask.new do |t|
   t.libs << 'lib'
-  t.pattern = 'test/**/*_test.rb'
+  test_files = FileList['test/**/*_test.rb']
+  test_files.exclude('test/rails/*')
+  t.test_files = test_files
   t.verbose = true
 end
 Rake::Task[:test].send(:add_comment, <<END)