diff --git a/test/test_set.py b/test/test_set.py
index a2073cf..9cec2dd 100644
--- a/test/test_set.py
+++ b/test/test_set.py
@@ -45,6 +45,11 @@ def test_to_json(self):
         b = AbstractSimpleSet.from_json(a.to_json())
         self.assertEqual(a, b)
 
+    def test_copy(self):
+        a = TestEnum.A
+        b = a.__deepcopy__()
+        self.assertEqual(a, b)
+
 
 class SetTestCase(unittest.TestCase):