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Add more tests for variable substitution in generics (GH-31170)

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(cherry picked from commit 3da5526136)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2022-02-06 12:15:29 -08:00 • committed by GitHub
parent c88407ccf5
commit cb789944b2
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1 changed files with 27 additions and 0 deletions
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27
Lib/test/test_typing.py
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@ -247,6 +247,15 @@ class TypeVarTests(BaseTestCase):
with self.assertRaises(ValueError):
TypeVar('T', covariant=True, contravariant=True)
def test_bad_var_substitution(self):
T = TypeVar('T')
for arg in (), (int, str):
with self.subTest(arg=arg):
with self.assertRaises(TypeError):
List[T][arg]
with self.assertRaises(TypeError):
list[T][arg]
class UnionTests(BaseTestCase):
@ -560,8 +569,11 @@ class BaseCallableTests:
C2 = Callable[[KT, T], VT]
C3 = Callable[..., T]
self.assertEqual(C1[str], Callable[[int, str], str])
if Callable is typing.Callable:
self.assertEqual(C1[None], Callable[[int, type(None)], type(None)])
self.assertEqual(C2[int, float, str], Callable[[int, float], str])
self.assertEqual(C3[int], Callable[..., int])
self.assertEqual(C3[NoReturn], Callable[..., NoReturn])
# multi chaining
C4 = C2[int, VT, str]
@ -4880,6 +4892,17 @@ class ParamSpecTests(BaseTestCase):
self.assertEqual(G1.__args__, ((int, str), (bytes,)))
self.assertEqual(G2.__args__, ((int,), (str, bytes)))
def test_bad_var_substitution(self):
T = TypeVar('T')
P = ParamSpec('P')
bad_args = (42, int, None, T, int|str, Union[int, str])
for arg in bad_args:
with self.subTest(arg=arg):
with self.assertRaises(TypeError):
typing.Callable[P, T][arg, str]
with self.assertRaises(TypeError):
collections.abc.Callable[P, T][arg, str]
def test_no_paramspec_in__parameters__(self):
# ParamSpec should not be found in __parameters__
# of generics. Usages outside Callable, Concatenate
@ -4909,6 +4932,10 @@ class ParamSpecTests(BaseTestCase):
self.assertEqual(G1.__parameters__, (P, T))
self.assertEqual(G2.__parameters__, (P, T))
self.assertEqual(G3.__parameters__, (P, T))
C = Callable[[int, str], float]
self.assertEqual(G1[[int, str], float], List[C])
self.assertEqual(G2[[int, str], float], list[C])
self.assertEqual(G3[[int, str], float], list[C] | int)
class ConcatenateTests(BaseTestCase):