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bpo-43224: Add tests for pickling and copying of unpacked native tuple #32159

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merged 3 commits into from
Apr 5, 2022
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bpo-43224: Add tests for pickling and copying of unpacked native tuple #32159

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1f8a9e3
Add tests for pickling and copying of unpack native tuple
mrahtz Mar 28, 2022
735a544
Use subTest
mrahtz Mar 28, 2022
37845dd
Update Lib/test/test_genericalias.py
JelleZijlstra Apr 5, 2022
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73 changes: 56 additions & 17 deletions Lib/test/test_genericalias.py
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Original file line number Diff line number Diff line change
Expand Up @@ -47,12 +47,44 @@
from queue import Queue, SimpleQueue
from weakref import WeakSet, ReferenceType, ref
import typing
from typing import Unpack

from typing import TypeVar
T = TypeVar('T')
K = TypeVar('K')
V = TypeVar('V')

_UNPACKED_TUPLES = [
# Unpacked tuple using `*`
(*tuple[int],)[0],
(*tuple[T],)[0],
(*tuple[int, str],)[0],
(*tuple[int, ...],)[0],
(*tuple[T, ...],)[0],
tuple[*tuple[int, ...]],
tuple[*tuple[T, ...]],
tuple[str, *tuple[int, ...]],
tuple[*tuple[int, ...], str],
tuple[float, *tuple[int, ...], str],
tuple[*tuple[*tuple[int, ...]]],
# Unpacked tuple using `Unpack`
Unpack[tuple[int]],
Unpack[tuple[T]],
Unpack[tuple[int, str]],
Unpack[tuple[int, ...]],
Unpack[tuple[T, ...]],
tuple[Unpack[tuple[int, ...]]],
tuple[Unpack[tuple[T, ...]]],
tuple[str, Unpack[tuple[int, ...]]],
tuple[Unpack[tuple[int, ...]], str],
tuple[float, Unpack[tuple[int, ...]], str],
tuple[Unpack[tuple[Unpack[tuple[int, ...]]]]],
# Unpacked tuple using `*` AND `Unpack`
tuple[Unpack[tuple[*tuple[int, ...]]]],
tuple[*tuple[Unpack[tuple[int, ...]]]],
]


class BaseTest(unittest.TestCase):
"""Test basics."""
generic_types = [type, tuple, list, dict, set, frozenset, enumerate,
Expand Down Expand Up @@ -351,13 +383,15 @@ class MyType(type):
MyType[int]

def test_pickle(self):
alias = GenericAlias(list, T)
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
s = pickle.dumps(alias, proto)
loaded = pickle.loads(s)
self.assertEqual(loaded.__origin__, alias.__origin__)
self.assertEqual(loaded.__args__, alias.__args__)
self.assertEqual(loaded.__parameters__, alias.__parameters__)
aliases = [GenericAlias(list, T)] + _UNPACKED_TUPLES
for alias in aliases:
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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with self.subTest(alias=alias, proto=proto):
s = pickle.dumps(alias, proto)
loaded = pickle.loads(s)
self.assertEqual(loaded.__origin__, alias.__origin__)
self.assertEqual(loaded.__args__, alias.__args__)
self.assertEqual(loaded.__parameters__, alias.__parameters__)

def test_copy(self):
class X(list):
Expand All @@ -366,16 +400,21 @@ def __copy__(self):
def __deepcopy__(self, memo):
return self

for origin in list, deque, X:
alias = GenericAlias(origin, T)
copied = copy.copy(alias)
self.assertEqual(copied.__origin__, alias.__origin__)
self.assertEqual(copied.__args__, alias.__args__)
self.assertEqual(copied.__parameters__, alias.__parameters__)
copied = copy.deepcopy(alias)
self.assertEqual(copied.__origin__, alias.__origin__)
self.assertEqual(copied.__args__, alias.__args__)
self.assertEqual(copied.__parameters__, alias.__parameters__)
aliases = [
GenericAlias(list, T),
GenericAlias(deque, T),
GenericAlias(X, T)
] + _UNPACKED_TUPLES
for alias in aliases:
with self.subTest(alias=alias):
copied = copy.copy(alias)
self.assertEqual(copied.__origin__, alias.__origin__)
self.assertEqual(copied.__args__, alias.__args__)
self.assertEqual(copied.__parameters__, alias.__parameters__)
copied = copy.deepcopy(alias)
self.assertEqual(copied.__origin__, alias.__origin__)
self.assertEqual(copied.__args__, alias.__args__)
self.assertEqual(copied.__parameters__, alias.__parameters__)

def test_union(self):
a = typing.Union[list[int], list[str]]
Expand Down