bpo-32999: Fix ABC.__subclasscheck__ crash (GH-6002)
(cherry picked from commit fc7df0e664198cb05cafd972f190a18ca422989c)
Co-authored-by: INADA Naoki <methane@users.noreply.github.com>
diff --git a/Lib/test/test_abc.py b/Lib/test/test_abc.py
index af26c1d..6fc3c95 100644
--- a/Lib/test/test_abc.py
+++ b/Lib/test/test_abc.py
@@ -392,6 +392,24 @@
self.assertIsInstance(42, A)
self.assertIsInstance(42, (A,))
+ def test_issubclass_bad_arguments(self):
+ class A(metaclass=abc_ABCMeta):
+ pass
+
+ with self.assertRaises(TypeError):
+ issubclass({}, A) # unhashable
+
+ with self.assertRaises(TypeError):
+ issubclass(42, A) # No __mro__
+
+ # Python version supports any iterable as __mro__.
+ # But it's implementation detail and don't emulate it in C version.
+ class C:
+ __mro__ = 42 # __mro__ is not tuple
+
+ with self.assertRaises(TypeError):
+ issubclass(C(), A)
+
def test_all_new_methods_are_called(self):
class A(metaclass=abc_ABCMeta):
pass