1 files changed, 30 insertions, 0 deletions
diff --git a/test/psych/test_hash.rb b/test/psych/test_hash.rb
new file mode 100644
index 0000000000..84de492d35
--- /dev/null
+++ b/test/psych/test_hash.rb
@@ -0,0 +1,30 @@
+require 'test/psych/helper'
+
+module Psych
+  class TestHash < TestCase
+    def setup
+      super
+      @hash = { :a => 'b' }
+    end
+
+    def test_self_referential
+      @hash['self'] = @hash
+      assert_cycle(@hash)
+    end
+
+    def test_cycles
+      assert_cycle(@hash)
+    end
+
+    def test_ref_append
+      hash = Psych.load(<<-eoyml)
+---
+foo: &foo
+  hello: world
+bar:
+  <<: *foo
+eoyml
+      assert_equal({"foo"=>{"hello"=>"world"}, "bar"=>{"hello"=>"world"}}, hash)
+    end
+  end
+end