test/psych/test_object.rb in psych-1.2.0 vs test/psych/test_object.rb in psych-1.2.1

@@ -9,10 +9,18 @@
     def initialize
       @baz = 'bar'
     end
   end
 
+  class Foo
+    attr_accessor :parent
+
+    def initialize parent
+      @parent = parent
+    end
+  end
+
   class TestObject < TestCase
     def test_dump_with_tag
       tag = Tagged.new
       assert_match('foo', Psych.dump(tag))
     end
@@ -20,8 +28,17 @@
     def test_tag_round_trip
       tag   = Tagged.new
       tag2  = Psych.load(Psych.dump(tag))
       assert_equal tag.baz, tag2.baz
       assert_instance_of(Tagged, tag2)
+    end
+
+    def test_cyclic_references
+      foo = Foo.new(nil)
+      foo.parent = foo
+      loaded = Psych.load Psych.dump foo
+
+      assert_instance_of(Foo, loaded)
+      assert_equal loaded, loaded.parent
     end
   end
 end