1 files changed, 7 insertions, 0 deletions
diff --git a/Lib/test/test_abc.py b/Lib/test/test_abc.py
index e6c8415..a04b271 100644
--- a/Lib/test/test_abc.py
+++ b/Lib/test/test_abc.py
@@ -146,6 +146,13 @@ class TestABC(unittest.TestCase):
         C()
         self.assertEqual(B.counter, 1)
 
+    def test_error_on_subclass(self):
+        class A(abc.ABCMeta):
+            pass
+        class B:
+            pass
+        self.assertRaises(TypeError, A.register, B)
+
 
 def test_main():
     test_support.run_unittest(TestABC)