1 files changed, 8 insertions, 0 deletions
diff --git a/test/thread/test_queue.rb b/test/thread/test_queue.rb
index bf8344fade..07a611ddd2 100644
--- a/test/thread/test_queue.rb
+++ b/test/thread/test_queue.rb
@@ -200,4 +200,12 @@ class TestQueue < Test::Unit::TestCase
       timeout(1) { th2.join }
     end
   end
+
+  def test_dup
+    bug9440 = '[ruby-core:59961] [Bug #9440]'
+    q = Queue.new
+    assert_raise(NoMethodError, bug9440) do
+      q.dup
+    end
+  end
 end