Ensure that TimeWithZone#to_yaml works when passed a YAML::Emitter. [rick]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@9081 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/CHANGELOG

 *SVN*
 
+* Ensure that TimeWithZone#to_yaml works when passed a YAML::Emitter.  [rick]
+
 * Ensure correct TimeWithZone#to_date [Geoff Buesing]
 
 * Make TimeWithZone work with tzinfo 0.2.x: use TZInfo::Timezone#zone_identifier alias for #abbreviation, silence warnings on tests. Raise LoadError when TZInfo version is < 0.2 by sniffing for TZInfo::TimeOrDateTime constant. Move all tzinfo-dependent TimeZone tests into uses_tzinfo block [Geoff Buesing]

activesupport/lib/active_support/time_with_zone.rb

@@ -80,7 +80,11 @@ def to_json(options = nil)
     end
     
     def to_yaml(options = {})
-      time.to_yaml(options).gsub('Z', formatted_offset(true, 'Z'))
+      if options.kind_of?(YAML::Emitter)
+        utc.to_yaml(options)
+      else
+        time.to_yaml(options).gsub('Z', formatted_offset(true, 'Z'))
+      end
     end
     
     def httpdate

activesupport/test/core_ext/time_with_zone_test.rb

@@ -106,6 +106,12 @@ def test_to_yaml
       end
     end
     
+    def test_ruby_to_yaml
+      silence_warnings do
+        assert_equal "--- \n:twz: 2000-01-01 00:00:00 Z\n", {:twz => @twz}.to_yaml
+      end
+    end
+    
     def test_httpdate
       silence_warnings do # silence warnings raised by tzinfo gem
         assert_equal 'Sat, 01 Jan 2000 00:00:00 GMT', @twz.httpdate