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gh-132805 - annotationlib - Fix unions of real types and forward references. #132806

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gh-132805 - annotationlib - Fix unions of real types and forward references. #132806

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fba5efa
Add a test for union forward references
DavidCEllis Apr 22, 2025
d810953
Make stringifiers create unions if create_unions is True
DavidCEllis Apr 22, 2025
1908a4a
modify broken test, move test to forwardref format group
DavidCEllis Apr 22, 2025
97abdc7
Apparently trim trailing whitespace was turned off
DavidCEllis Apr 22, 2025
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Add a test for union forward references
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@DavidCEllis
DavidCEllis committed Apr 22, 2025
commit fba5efa2a04871b845403443f85b18a20d303e3a
22 changes: 22 additions & 0 deletions Lib/test/test_annotationlib.py
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Expand Up @@ -936,6 +936,28 @@ def __call__(self):
annotationlib.get_annotations(obj, format=format), {}
)

def test_union_forwardref(self):
# Test unions with '|' syntax equal unions with typing.Union[] with forwardrefs
class UnionForwardrefs:
pipe: str | undefined
union: Union[str, undefined]

annos = get_annotations(UnionForwardrefs, format=Format.FORWARDREF)

match = (
str,
support.EqualToForwardRef("undefined", is_class=True, owner=UnionForwardrefs)
)

self.assertEqual(
typing.get_args(annos["pipe"]),
typing.get_args(annos["union"])
)

self.assertEqual(typing.get_args(annos["pipe"]), match)
self.assertEqual(typing.get_args(annos["union"]), match)


def test_pep695_generic_class_with_future_annotations(self):
ann_module695 = inspect_stringized_annotations_pep695
A_annotations = annotationlib.get_annotations(ann_module695.A, eval_str=True)
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