Method test_gh146587

Lib/test/test_descr.py:5386–5409

(self)

            B().foo

    def test_gh146587(self):
        # See https://github.com/python/cpython/issues/146587

        class A:
            def __radd__(self, other): ...

        class B(tuple): ...

        self.assertIsNone(() + A())
        self.assertIsNone(B() + A())

        from typing import NamedTuple

        class T(NamedTuple):
            x: int

        class A:
            def __init__(self, *args):
                self.lst = list(args)
            def __radd__(self, other):
                return A(*self.lst, other)

        self.assertEqual(((1,)+A()).lst, [(1,)])
        self.assertEqual((T(x=1)+A()).lst, [T(x=1)])


class DictProxyTests(unittest.TestCase):