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gh-109409: Fix inheritance of frozen dataclass from non-frozen dataclass mixins (gh-109437)

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Fix inheritance of frozen dataclass from non-frozen dataclass mixins
This commit is contained in:
Nikita Sobolev 2023-10-12 16:05:23 +03:00 • committed by GitHub
parent 7dd3c2b800
commit b6000d2874
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3 changed files with 107 additions and 4 deletions
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95
Lib/test/test_dataclasses/__init__.py
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@ -2863,6 +2863,101 @@ class TestFrozen(unittest.TestCase):
class D(C):
j: int
def test_inherit_frozen_mutliple_inheritance(self):
@dataclass
class NotFrozen:
pass
@dataclass(frozen=True)
class Frozen:
pass
class NotDataclass:
pass
for bases in (
(NotFrozen, Frozen),
(Frozen, NotFrozen),
(Frozen, NotDataclass),
(NotDataclass, Frozen),
):
with self.subTest(bases=bases):
with self.assertRaisesRegex(
TypeError,
'cannot inherit non-frozen dataclass from a frozen one',
):
@dataclass
class NotFrozenChild(*bases):
pass
for bases in (
(NotFrozen, Frozen),
(Frozen, NotFrozen),
(NotFrozen, NotDataclass),
(NotDataclass, NotFrozen),
):
with self.subTest(bases=bases):
with self.assertRaisesRegex(
TypeError,
'cannot inherit frozen dataclass from a non-frozen one',
):
@dataclass(frozen=True)
class FrozenChild(*bases):
pass
def test_inherit_frozen_mutliple_inheritance_regular_mixins(self):
@dataclass(frozen=True)
class Frozen:
pass
class NotDataclass:
pass
class C1(Frozen, NotDataclass):
pass
self.assertEqual(C1.__mro__, (C1, Frozen, NotDataclass, object))
class C2(NotDataclass, Frozen):
pass
self.assertEqual(C2.__mro__, (C2, NotDataclass, Frozen, object))
@dataclass(frozen=True)
class C3(Frozen, NotDataclass):
pass
self.assertEqual(C3.__mro__, (C3, Frozen, NotDataclass, object))
@dataclass(frozen=True)
class C4(NotDataclass, Frozen):
pass
self.assertEqual(C4.__mro__, (C4, NotDataclass, Frozen, object))
def test_multiple_frozen_dataclasses_inheritance(self):
@dataclass(frozen=True)
class FrozenA:
pass
@dataclass(frozen=True)
class FrozenB:
pass
class C1(FrozenA, FrozenB):
pass
self.assertEqual(C1.__mro__, (C1, FrozenA, FrozenB, object))
class C2(FrozenB, FrozenA):
pass
self.assertEqual(C2.__mro__, (C2, FrozenB, FrozenA, object))
@dataclass(frozen=True)
class C3(FrozenA, FrozenB):
pass
self.assertEqual(C3.__mro__, (C3, FrozenA, FrozenB, object))
@dataclass(frozen=True)
class C4(FrozenB, FrozenA):
pass
self.assertEqual(C4.__mro__, (C4, FrozenB, FrozenA, object))
def test_inherit_nonfrozen_from_empty(self):
@dataclass
class C: