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bpo-46386: improve test_typing:test_immutability_by_copy_and_pickle (GH-30613)

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Nikita Sobolev 2022-01-16 10:32:11 +03:00 committed by GitHub
parent acf7403f9b
commit 09087b8519
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1 changed files with 16 additions and 8 deletions
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24
Lib/test/test_typing.py
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@ -2130,22 +2130,30 @@ class GenericTests(BaseTestCase):
def test_immutability_by_copy_and_pickle(self):
# Special forms like Union, Any, etc., generic aliases to containers like List,
# Mapping, etc., and type variabcles are considered immutable by copy and pickle.
global TP, TPB, TPV # for pickle
global TP, TPB, TPV, PP # for pickle
TP = TypeVar('TP')
TPB = TypeVar('TPB', bound=int)
TPV = TypeVar('TPV', bytes, str)
for X in [TP, TPB, TPV, List, typing.Mapping, ClassVar, typing.Iterable,
PP = ParamSpec('PP')
for X in [TP, TPB, TPV, PP,
List, typing.Mapping, ClassVar, typing.Iterable,
Union, Any, Tuple, Callable]:
self.assertIs(copy(X), X)
self.assertIs(deepcopy(X), X)
self.assertIs(pickle.loads(pickle.dumps(X)), X)
with self.subTest(thing=X):
self.assertIs(copy(X), X)
self.assertIs(deepcopy(X), X)
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
self.assertIs(pickle.loads(pickle.dumps(X, proto)), X)
del TP, TPB, TPV, PP
# Check that local type variables are copyable.
TL = TypeVar('TL')
TLB = TypeVar('TLB', bound=int)
TLV = TypeVar('TLV', bytes, str)
for X in [TL, TLB, TLV]:
self.assertIs(copy(X), X)
self.assertIs(deepcopy(X), X)
PL = ParamSpec('PL')
for X in [TL, TLB, TLV, PL]:
with self.subTest(thing=X):
self.assertIs(copy(X), X)
self.assertIs(deepcopy(X), X)
def test_copy_generic_instances(self):
T = TypeVar('T')