1 files changed, 9 insertions, 0 deletions
diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index 1806746ef2..f1eef88d99 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -325,6 +325,15 @@ class TestHash < Test::Unit::TestCase
     end
   end
 
+  def test_dup_equality
+    h = {'k' => 'v'}
+    assert_equal(h, h.dup)
+    h1 = {h => 1}
+    assert_equal(h1, h1.dup)
+    h[1] = 2
+    assert_equal(h1, h1.dup)
+  end
+
   def test_each
     count = 0
     @cls[].each { |k, v| count + 1 }