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test: functools: add test for bpo-40464 

Signed-off-by: Filipe Laíns <lains@archlinux.org>
This commit is contained in:
Filipe Laíns 2020-05-03 00:52:09 +01:00
parent 73433f7434
commit d8305d46c5
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1 changed files with 33 additions and 0 deletions
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33
Lib/test/test_functools.py
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@ -2441,6 +2441,39 @@ class TestSingleDispatch(unittest.TestCase):
'typing.Iterable[str] is not a class.'
))
with self.assertRaises(TypeError) as exc:
@i.register
def _(arg) -> str:
# At runtime, dispatching on generics is impossible.
# When registering implementations with singledispatch, avoid
# types from `typing`. Instead, annotate with regular types
# or ABCs.
return "I annotated with a generic collection"
self.assertTrue(str(exc.exception).startswith(
"Invalid first argument to `register()`:"
))
self.assertTrue(str(exc.exception).endswith(
'Use either `@register(some_class)` or plain `@register` on an annotated function.'
))
@functools.singledispatch
def i(arg1, arg2):
return "base"
with self.assertRaises(TypeError) as exc:
@i.register
def _(arg1, arg2: int) -> str:
# At runtime, dispatching on generics is impossible.
# When registering implementations with singledispatch, avoid
# types from `typing`. Instead, annotate with regular types
# or ABCs.
return "I annotated with a generic collection"
self.assertTrue(str(exc.exception).startswith(
"Invalid first argument to `register()`:"
))
self.assertTrue(str(exc.exception).endswith(
'Use either `@register(some_class)` or plain `@register` on an annotated function.'
))
def test_invalid_positional_argument(self):
@functools.singledispatch
def f(*args):