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# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
import pickle
from dataclasses import dataclass
from typing import ClassVar
from libcst._add_slots import add_slots
from libcst.testing.utils import UnitTest
# this test class needs to be defined at module level to test pickling.
@add_slots
@dataclass(frozen=True)
class A:
x: int
y: str
Z: ClassVar[int] = 5
class AddSlotsTest(UnitTest):
def test_pickle(self) -> None:
a = A(1, "foo")
self.assertEqual(a, pickle.loads(pickle.dumps(a)))
object.__delattr__(a, "y")
self.assertEqual(a.x, pickle.loads(pickle.dumps(a)).x)
def test_prevents_slots_overlap(self) -> None:
class A:
__slots__ = ("x",)
class B(A):
__slots__ = ("z",)
@add_slots
@dataclass
class C(B):
x: int
y: str
z: bool
self.assertSequenceEqual(C.__slots__, ("y",))
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