1 files changed, 28 insertions, 0 deletions
diff --git a/test/psych/test_hash.rb b/test/psych/test_hash.rb
index 8d7ba1b1e0..066df6612e 100644
--- a/test/psych/test_hash.rb
+++ b/test/psych/test_hash.rb
@@ -5,11 +5,39 @@ module Psych
     class X < Hash
     end
 
+    class HashWithCustomInit < Hash
+      attr_reader :obj
+      def initialize(obj)
+        @obj = obj
+      end
+    end
+
+    class HashWithCustomInitNoIvar < Hash
+      def initialize(obj)
+        # *shrug*
+      end
+    end
+
     def setup
       super
       @hash = { :a => 'b' }
     end
 
+    def test_custom_initialized
+      a = [1,2,3,4,5]
+      t1 = HashWithCustomInit.new(a)
+      t2 = Psych.load(Psych.dump(t1))
+      assert_equal t1, t2
+      assert_cycle t1
+    end
+
+    def test_custom_initialize_no_ivar
+      t1 = HashWithCustomInitNoIvar.new(nil)
+      t2 = Psych.load(Psych.dump(t1))
+      assert_equal t1, t2
+      assert_cycle t1
+    end
+
     def test_hash_with_ivars
       @hash.instance_variable_set :@foo, 'bar'
       dup = Psych.load Psych.dump @hash