Add simple test.

python · JelleZijlstra · Apr 21, 2025 · Apr 21, 2025 · Apr 21, 2025 · Apr 21, 2025
commit b9b4fa22e6966ada1cdf72f8f7b5feb8575e5350
diff --git a/Lib/test/test_types.py b/Lib/test/test_types.py
@@ -653,6 +653,24 @@ def test_method_descriptor_types(self):
        self.assertIsInstance(int.from_bytes, types.BuiltinMethodType)
        self.assertIsInstance(int.__new__, types.BuiltinMethodType)

+    def test_method_descriptor_crash(self):
+        # gh-132747: The default __get__() implementation in C was unable
+        # to handle a second argument of None when called from Python
+        import _io
+        import io
+        import _queue
+
+        types = [
+            # (method, instance)
+            (_io.TextIOWrapper.write, io.StringIO()),
+            (_queue.SimpleQueue.put, _queue.SimpleQueue()),
+            (str.capitalize, "nobody expects the spanish inquisition")
+        ]
+
+        for method, instance in types:
+            with self.subTest(method=method, instance=instance):
+                method.__get__(instance)
+
    def test_ellipsis_type(self):
        self.assertIsInstance(Ellipsis, types.EllipsisType)