commit 77d12ecaade4ef1b0719412cd85aeba81e3d4563
author Benjamin Peterson <benjamin@python.org> Tue Oct 06 19:36:54 2015 -0700
committer Benjamin Peterson <benjamin@python.org> Tue Oct 06 19:36:54 2015 -0700
tree f144de8a3f88eaf14550ac73b5ab478256afd00e
parent 51cd53e152b80614e59fb97fce568e6c700ce981

prevent unacceptable bases from becoming bases through multiple inheritance (#24806)

Lib/test/test_descr.py

diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 0ac458f..25f65c5 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -4065,6 +4065,37 @@
         else:
             assert 0, "best_base calculation found wanting"
 
+    def test_unsubclassable_types(self):
+        with self.assertRaises(TypeError):
+            class X(types.NoneType):
+                pass
+        with self.assertRaises(TypeError):
+            class X(object, types.NoneType):
+                pass
+        with self.assertRaises(TypeError):
+            class X(types.NoneType, object):
+                pass
+        class O(object):
+            pass
+        with self.assertRaises(TypeError):
+            class X(O, types.NoneType):
+                pass
+        with self.assertRaises(TypeError):
+            class X(types.NoneType, O):
+                pass
+
+        class X(object):
+            pass
+        with self.assertRaises(TypeError):
+            X.__bases__ = types.NoneType,
+        with self.assertRaises(TypeError):
+            X.__bases__ = object, types.NoneType
+        with self.assertRaises(TypeError):
+            X.__bases__ = types.NoneType, object
+        with self.assertRaises(TypeError):
+            X.__bases__ = O, types.NoneType
+        with self.assertRaises(TypeError):
+            X.__bases__ = types.NoneType, O
 
     def test_mutable_bases_with_failing_mro(self):
         # Testing mutable bases with failing mro...