diff options
Diffstat (limited to 'Lib/test/test_types.py')
-rw-r--r-- | Lib/test/test_types.py | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Lib/test/test_types.py b/Lib/test/test_types.py index 5e741153f4..a202196bd2 100644 --- a/Lib/test/test_types.py +++ b/Lib/test/test_types.py @@ -1000,6 +1000,24 @@ class ClassCreationTests(unittest.TestCase): with self.assertRaises(TypeError): X = types.new_class("X", (int(), C)) + def test_one_argument_type(self): + expected_message = 'type.__new__() takes exactly 3 arguments (1 given)' + + # Only type itself can use the one-argument form (#27157) + self.assertIs(type(5), int) + + class M(type): + pass + with self.assertRaises(TypeError) as cm: + M(5) + self.assertEqual(str(cm.exception), expected_message) + + class N(type, metaclass=M): + pass + with self.assertRaises(TypeError) as cm: + N(5) + self.assertEqual(str(cm.exception), expected_message) + class SimpleNamespaceTests(unittest.TestCase): |