Merge pull request #597 from kdmsnr/set-warning-false-in-test

Set warning to false in test

Rakefile

@@ -24,6 +24,7 @@ Rake::TestTask.new("test") do |t|
   t.libs << "test"
   t.test_files = Dir.glob("test/**/test_*.rb")
   t.verbose = true
+  t.warning = false
 end
 
 begin