Set yamler as syck.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34014 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/syck/test_array.rb

@@ -4,9 +4,15 @@ require 'yaml'
 module Syck
   class TestArray < Test::Unit::TestCase
     def setup
+      @current_engine = YAML::ENGINE.yamler
+      YAML::ENGINE.yamler = 'syck'
       @list = [{ :a => 'b' }, 'foo']
     end
 
+    def teardown
+      YAML::ENGINE.yamler = @current_engine
+    end
+
     def test_to_yaml
       assert_equal @list, YAML.load(@list.to_yaml)
     end