diff --git a/Rakefile b/Rakefile
index a9d5534c..1425d24a 100644
--- a/Rakefile
+++ b/Rakefile
@@ -41,8 +41,9 @@ require 'rake/testtask'
 
 Rake::TestTask.new do |t|
   t.libs << 'test'
+  t.libs << 'lib'
   t.test_files = FileList['test/**/*_test.rb']
-  t.ruby_opts = ['-r./test/test_helper.rb']
+  t.ruby_opts = ['-w -r./test/test_helper.rb']
   t.verbose = true
 end