test that the custom ordered hash can be round-tripped

activesupport/lib/active_support/ordered_hash.rb

-begin
-  require 'psych'
-rescue LoadError
-end
-
 require 'yaml'
 
 YAML.add_builtin_type("omap") do |type, val|

activesupport/test/ordered_hash_test.rb

@@ -261,6 +261,23 @@ def test_order_after_yaml_serialization_with_nested_arrays
     assert_equal @ordered_hash.values, @deserialized_ordered_hash.values
   end
 
+  begin
+    require 'psych'
+
+    def test_psych_serialize
+      @deserialized_ordered_hash = Psych.load(Psych.dump(@ordered_hash))
+
+      values = @deserialized_ordered_hash.map { |_, value| value }
+      assert_equal @values, values
+    end
+
+    def test_psych_serialize_tag
+      yaml = Psych.dump(@ordered_hash)
+      assert_match '!omap', yaml
+    end
+  rescue LoadError
+  end
+
   def test_has_yaml_tag
     @ordered_hash[:array] = %w(a b c)
     assert_match '!omap', YAML.dump(@ordered_hash)