Update Lib/test/test_descr.py

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: Aniketsy

Lib/test/test_descr.py

@@ -1837,7 +1837,7 @@ def test_staticmethod_new(self):
 
     def test_classmethod_new_none_repr(self):
         cm = classmethod.__new__(classmethod, None)
-        self.assertIsInstance(repr(cm), str)
+        self.assertEqual(repr(cm), '<classmethod(None)>')
 
     def test_staticmethod_func_readonly(self):
         sm = staticmethod(lambda x: x)