* test/psych/test_emitter.rb (setup): encoding of @out should be same as script's.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27126 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/psych/test_emitter.rb

@@ -6,7 +6,7 @@ module Psych
   class TestEmitter < TestCase
     def setup
       super
-      @out = StringIO.new
+      @out = StringIO.new('')
       @emitter = Psych::Emitter.new @out
     end