8000 gh-105433: Add `pickle` tests for PEP695 (#105443) · python/cpython@1af8251 · GitHub
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gh-105433: Add pickle tests for PEP695 (#105443)
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‎Lib/test/test_type_aliases.py

Lines changed: 65 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -228,8 +228,69 @@ def test_module(self):
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self.assertEqual(mod_generics_cache.OldStyle.__module__,
229229
mod_generics_cache.__name__)
230230

231+
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# All these type aliases are used for pickling tests:
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T = TypeVar('T')
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type SimpleAlias = int
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type RecursiveAlias = dict[str, RecursiveAlias]
236+
type GenericAlias[X] = list[X]
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type GenericAliasMultipleTypes[X, Y] = dict[X, Y]
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type RecursiveGenericAlias[X] = dict[str, RecursiveAlias[X]]
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type BoundGenericAlias[X: int] = set[X]
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type ConstrainedGenericAlias[LongName: (str, bytes)] = list[LongName]
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type AllTypesAlias[A, *B, **C] = Callable[C, A] | tuple[*B]
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class TypeAliasPickleTest(unittest.TestCase):
231245
def test_pickling(self):
232-
pickled = pickle.dumps(mod_generics_cache.Alias)
233-
self.assertIs(pickle.loads(pickled), mod_generics_cache.Alias)
234-
pickled = pickle.dumps(mod_generics_cache.OldStyle)
235-
self.assertIs(pickle.loads(pickled), mod_generics_cache.OldStyle)
246+
things_to_test = [
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SimpleAlias,
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RecursiveAlias,
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GenericAlias,
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GenericAlias[T],
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GenericAlias[int],
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GenericAliasMultipleTypes,
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GenericAliasMultipleTypes[str, T],
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GenericAliasMultipleTypes[T, str],
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GenericAliasMultipleTypes[int, str],
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RecursiveGenericAlias,
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RecursiveGenericAlias[T],
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RecursiveGenericAlias[int],
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BoundGenericAlias,
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BoundGenericAlias[int],
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BoundGenericAlias[T],
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ConstrainedGenericAlias,
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ConstrainedGenericAlias[str],
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ConstrainedGenericAlias[T],
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AllTypesAlias,
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AllTypesAlias[int, str, T, [T, object]],
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# Other modules:
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mod_generics_cache.Alias,
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mod_generics_cache.OldStyle,
277+
]
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for thing in things_to_test:
279+
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
280+
with self.subTest(thing=thing, proto=proto):
281+
pickled = pickle.dumps(thing, protocol=proto)
282+
self.assertEqual(pickle.loads(pickled), thing)
283+
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type ClassLevel = str
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def test_pickling_local(self):
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type A = int
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things_to_test = [
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self.ClassLevel,
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A,
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]
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for thing in things_to_test:
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for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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with self.subTest(thing=thing, proto=proto):
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with self.assertRaises(pickle.PickleError):
296+
pickle.dumps(thing, protocol=proto)

‎Lib/test/test_type_params.py

Lines changed: 66 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2,6 +2,7 @@
22
import textwrap
33
import types
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import unittest
5+
import pickle
56
from test.support import requires_working_socket, check_syntax_error, run_code
67

78
from typing import Generic, Sequence, TypeVar, TypeVarTuple, ParamSpec, get_args
@@ -855,3 +856,68 @@ def func[A]():
855856

856857
ns = run_code(code)
857858
self.assertEqual(ns["func"].__type_params__, ())
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# All these type aliases are used for pickling tests:
863+
T = TypeVar('T')
864+
def func1[X](x: X) -> X: ...
865+
def func2[X, Y](x: X | Y) -> X | Y: ...
866+
def func3[X, *Y, **Z](x: X, y: tuple[*Y], z: Z) -> X: ...
867+
def func4[X: int, Y: (bytes, str)](x: X, y: Y) -> X | Y: ...
868+
869+
class Class1[X]: ...
870+
class Class2[X, Y]: ...
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class Class3[X, *Y, **Z]: ...
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class Class4[X: int, Y: (bytes, str)]: ...
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class TypeParamsPickleTest(unittest.TestCase):
876+
def test_pickling_functions(self):
877+
things_to_test = [
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func1,
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func2,
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func3,
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func4,
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]
883+
for thing in things_to_test:
884+
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
885+
with self.subTest(thing=thing, proto=proto):
886+
pickled = pickle.dumps(thing, protocol=proto)
887+
self.assertEqual(pickle.loads(pickled), thing)
888+
889+
def test_pickling_classes(self):
890+
things_to_test F5C7 = [
891+
Class1,
892+
Class1[int],
893+
Class1[T],
894+
895+
Class2,
896+
Class2[int, T],
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Class2[T, int],
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Class2[int, str],
899+
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Class3,
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Class3[int, T, str, bytes, [float, object, T]],
902+
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Class4,
904+
Class4[int, bytes],
905+
Class4[T, bytes],
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Class4[int, T],
907+
Class4[T, T],
908+
]
909+
for thing in things_to_test:
910+
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
911+
with self.subTest(thing=thing, proto=proto):
912+
pickled = pickle.dumps(thing, protocol=proto)
913+
self.assertEqual(pickle.loads(pickled), thing)
914+
915+
for klass in things_to_test:
916+
real_class = getattr(klass, '__origin__', klass)
917+
thing = klass()
918+
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
919+
with self.subTest(thing=thing, proto=proto):
920+
pickled = pickle.dumps(thing, protocol=proto)
921+
# These instances are not equal,
922+
# but class check is good enough:
923+
self.assertIsInstance(pickle.loads(pickled), real_class)

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