1 files changed, 20 insertions, 0 deletions
diff --git a/Lib/test/test_abc.py b/Lib/test/test_abc.py
index f43123f..0fa40cb 100644
--- a/Lib/test/test_abc.py
+++ b/Lib/test/test_abc.py
@@ -60,6 +60,26 @@ class TestABC(unittest.TestCase):
             self.assertRaises(TypeError, F)  # because bar is abstract now
             self.assertTrue(isabstract(F))
 
+    def test_type_has_no_abstractmethods(self):
+        # type pretends not to have __abstractmethods__.
+        self.assertRaises(AttributeError, getattr, type, "__abstractmethods__")
+        class meta(type):
+            pass
+        self.assertRaises(AttributeError, getattr, meta, "__abstractmethods__")
+
+    def test_metaclass_abc(self):
+        # Metaclasses can be ABCs, too.
+        class A(metaclass=abc.ABCMeta):
+            @abc.abstractmethod
+            def x(self):
+                pass
+        self.assertEqual(A.__abstractmethods__, {"x"})
+        class meta(type, A):
+            def x(self):
+                return 1
+        class C(metaclass=meta):
+            pass
+
     def test_registration_basics(self):
         class A(metaclass=abc.ABCMeta):
             pass