Include all tests in run

Rakefile

@@ -3,7 +3,7 @@ require 'rake/testtask'
 
 Rake::TestTask.new do |t|
   t.libs << "test"
-  t.pattern = "test/*_test.rb"
+  t.pattern = "test/**/*_test.rb"
 end
 
 task :default => :test