From abceb66c7e33d165361d8a26efb3770faa721aff Mon Sep 17 00:00:00 2001 From: "Miss Islington (bot)" <31488909+miss-islington@users.noreply.github.com> Date: Sun, 5 Dec 2021 13:04:29 -0800 Subject: bpo-45663: Fix is_dataclass() for dataclasses which are subclasses of types.GenericAlias (GH-29294) (cherry picked from commit 446be166861b2f08f87f74018113dd98ca5fca02) Co-authored-by: Serhiy Storchaka --- Lib/test/test_dataclasses.py | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'Lib/test/test_dataclasses.py') diff --git a/Lib/test/test_dataclasses.py b/Lib/test/test_dataclasses.py index 47075df8d5..ef5009ab11 100644 --- a/Lib/test/test_dataclasses.py +++ b/Lib/test/test_dataclasses.py @@ -8,6 +8,7 @@ import abc import pickle import inspect import builtins +import types import unittest from unittest.mock import Mock from typing import ClassVar, Any, List, Union, Tuple, Dict, Generic, TypeVar, Optional, Protocol @@ -1354,6 +1355,17 @@ class TestCase(unittest.TestCase): with self.assertRaisesRegex(TypeError, 'should be called on dataclass instances'): replace(obj, x=0) + def test_is_dataclass_genericalias(self): + @dataclass + class A(types.GenericAlias): + origin: type + args: type + self.assertTrue(is_dataclass(A)) + a = A(list, int) + self.assertTrue(is_dataclass(type(a))) + self.assertTrue(is_dataclass(a)) + + def test_helper_fields_with_class_instance(self): # Check that we can call fields() on either a class or instance, # and get back the same thing. -- cgit v1.2.1