ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5150 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/stringio/test_stringio.rb

@@ -11,4 +11,5 @@ class TestStringIO < Test::Unit::TestCase
     f = StringIO.new(content)
     yield f
   end
+  alias open_file_rw open_file
 end