bpo-45566: `test_frozen_pickle` checks all `pickle` protocols (GH-29150)
Refs https://github.com/python/cpython/pull/29147
Automerge-Triggered-By: GH:ericvsmith
(cherry picked from commit 07236d562e59c6650227be18fa6ffc66b18d4741)
Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
diff --git a/Lib/test/test_dataclasses.py b/Lib/test/test_dataclasses.py
index bdcb4a2..bbbb8e6 100644
--- a/Lib/test/test_dataclasses.py
+++ b/Lib/test/test_dataclasses.py
@@ -2859,13 +2859,26 @@ class FrozenSlotsClass:
foo: str
bar: int
+ @dataclass(frozen=True)
+ class FrozenWithoutSlotsClass:
+ foo: str
+ bar: int
+
def test_frozen_pickle(self):
# bpo-43999
- assert self.FrozenSlotsClass.__slots__ == ("foo", "bar")
- p = pickle.dumps(self.FrozenSlotsClass("a", 1))
- assert pickle.loads(p) == self.FrozenSlotsClass("a", 1)
+ self.assertEqual(self.FrozenSlotsClass.__slots__, ("foo", "bar"))
+ for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+ with self.subTest(proto=proto):
+ obj = self.FrozenSlotsClass("a", 1)
+ p = pickle.loads(pickle.dumps(obj, protocol=proto))
+ self.assertIsNot(obj, p)
+ self.assertEqual(obj, p)
+ obj = self.FrozenWithoutSlotsClass("a", 1)
+ p = pickle.loads(pickle.dumps(obj, protocol=proto))
+ self.assertIsNot(obj, p)
+ self.assertEqual(obj, p)
class TestDescriptors(unittest.TestCase):
def test_set_name(self):