[test] expand_path for src/test/ruby since -C will do a cd on rake test

Author: kares

Rakefile

@@ -39,7 +39,7 @@ file('lib/jopenssl.jar') { Rake::Task['jar'].invoke }
 
 require 'rake/testtask'
 Rake::TestTask.new do |task|
-  task.libs << 'src/test/ruby'
+  task.libs << File.expand_path('src/test/ruby', File.dirname(__FILE__))
   test_files = FileList['src/test/ruby/**/test*.rb'].to_a
   task.test_files = test_files.map { |path| path.sub('src/test/ruby/', '') }
   task.verbose = true