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[3.11] gh-102721: Improve coverage of _collections_abc._CallableGenericAlias #102788

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Merged
miss-islington merged 2 commits into from
Mar 17, 2023
Merged

[3.11] gh-102721: Improve coverage of _collections_abc._CallableGenericAlias #102788

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[3.11] gh-102721: Improve coverage of `_collections_abc._CallableGene…
sobolevn Mar 17, 2023
8d7145b
Update test_typing.py
sobolevn Mar 17, 2023
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29 changes: 22 additions & 7 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1633,14 +1633,29 @@ def test_weakref(self):
self.assertEqual(weakref.ref(alias)(), alias)

def test_pickle(self):
global T_pickle, P_pickle, TS_pickle # needed for pickling
Callable = self.Callable
alias = Callable[[int, str], float]
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
s = pickle.dumps(alias, proto)
loaded = pickle.loads(s)
self.assertEqual(alias.__origin__, loaded.__origin__)
self.assertEqual(alias.__args__, loaded.__args__)
self.assertEqual(alias.__parameters__, loaded.__parameters__)
T_pickle = TypeVar('T_pickle')
P_pickle = ParamSpec('P_pickle')
TS_pickle = TypeVarTuple('TS_pickle')

samples = [
Callable[[int, str], float],
Callable[P_pickle, int],
Callable[P_pickle, T_pickle],
Callable[Concatenate[int, P_pickle], int],
Callable[Concatenate[*TS_pickle, P_pickle], int],
]
for alias in samples:
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.subTest(alias=alias, proto=proto):
s = pickle.dumps(alias, proto)
loaded = pickle.loads(s)
self.assertEqual(alias.__origin__, loaded.__origin__)
self.assertEqual(alias.__args__, loaded.__args__)
self.assertEqual(alias.__parameters__, loaded.__parameters__)

del T_pickle, P_pickle, TS_pickle # cleaning up global state

def test_var_substitution(self):
Callable = self.Callable
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