--- rake-0.4.15\lib\rake\testtask.rb.orig	2005-02-03 17:01:28.771020800 +0900
+++ rake-0.4.15\lib\rake\testtask.rb	2005-02-03 17:14:11.267436800 +0900
@@ -77,10 +77,11 @@
     # Create the tasks defined by this task lib.
     def define
       lib_path = @libs.join(File::PATH_SEPARATOR)
+      testrb = "testrb#{/(ms|bcc)win32|mingw/ =~ RUBY_PLATFORM ? '.bat' : ''}"
       desc "Run tests" + (@name==:test ? "" : " for #{@name}")
       task @name do
 	RakeFileUtils.verbose(@verbose) do
-	  ruby %{-I#{lib_path} -S testrb #{file_list.join(' ')} #{option_list}}
+	  ruby %{-I#{lib_path} -Sx #{testrb} #{file_list.join(' ')} #{option_list}}
 	end
       end
       self