Suppress warnings

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40049 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/psych/helper.rb

@@ -3,6 +3,7 @@ require 'stringio'
 require 'tempfile'
 require 'date'
 require 'psych'
+require_relative '../ruby/envutil'
 
 module Psych
   class TestCase < MiniTest::Unit::TestCase

test/psych/test_deprecated.rb

@@ -3,6 +3,7 @@ require_relative 'helper'
 module Psych
   class TestDeprecated < TestCase
     def teardown
+      $VERBOSE = @orig_verbose
       Psych.domain_types.clear
     end
 
@@ -27,6 +28,7 @@ module Psych
 
     def setup
       @qe = QuickEmitter.new
+      @orig_verbose, $VERBOSE = $VERBOSE, false
     end
 
     def test_quick_emit
@@ -145,8 +147,10 @@ module Psych
     end
 
     class YamlAs
+      EnvUtil.suppress_warning do
         psych_yaml_as 'helloworld' # this should be yaml_as but to avoid syck
       end
+    end
 
     def test_yaml_as
       assert_match(/helloworld/, Psych.dump(YamlAs.new))

test/psych/test_encoding.rb

@@ -114,19 +114,14 @@ module Psych
     end
 
     def test_to_yaml_is_valid
-      ext_before = Encoding.default_external
-      int_before = Encoding.default_internal
-
-      Encoding.default_external = Encoding::US_ASCII
-      Encoding.default_internal = nil
-
+      EnvUtil.with_default_external(Encoding::US_ASCII) do
+        EnvUtil.with_default_internal(nil) do
           s = "こんにちは！"
           # If no encoding is specified, use UTF-8
           assert_equal Encoding::UTF_8, Psych.dump(s).encoding
           assert_equal s, Psych.load(Psych.dump(s))
-    ensure
-      Encoding.default_external = ext_before
-      Encoding.default_internal = int_before
+        end
+      end
     end
 
     def test_start_mapping
@@ -191,19 +186,14 @@ module Psych
     end
 
     def test_default_internal
-      before = Encoding.default_internal
-
-      Encoding.default_internal = 'EUC-JP'
-
+      EnvUtil.with_default_internal(Encoding::EUC_JP) do
         str  = "壁に耳あり、障子に目あり"
-      yaml = "--- #{str}"
         assert_equal @utf8, str.encoding
 
         @parser.parse str
-      assert_encodings Encoding.find('EUC-JP'), @handler.strings
+        assert_encodings Encoding::EUC_JP, @handler.strings
         assert_equal str, @handler.strings.first.encode('UTF-8')
-    ensure
-      Encoding.default_internal = before
+      end
     end
 
     def test_scalar