diff --git a/Tests/t_cidict.py b/Tests/t_cidict.py
index dea802d..00d0726 100644
--- a/Tests/t_cidict.py
+++ b/Tests/t_cidict.py
@@ -37,9 +37,12 @@ def test_cidict(self):
         cix_items = sorted(cix.items())
         self.assertEqual(cix_items, [('AbCDeF',123), ('xYZ',987)])
         del cix["abcdEF"]
-        self.assertEqual("abcdef" in cix, False)
+        self.assertEqual("abcdef" in cix._keys, False)
         self.assertEqual("AbCDef" in cix._keys, False)
+        self.assertEqual("abcdef" in cix, False)
+        self.assertEqual("AbCDef" in cix, False)
         self.assertEqual(cix.has_key("abcdef"), False)
+        self.assertEqual(cix.has_key("AbCDef"), False)
 
 
 if __name__ == '__main__':