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gh-90172: add test for functools.singledispatch on Union types with None type #92174

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Merged
merged 4 commits into from
May 3, 2022
Merged

gh-90172: add test for functools.singledispatch on Union types with None type #92174

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b1d5522
added test for functools.singledispatch on Union types with None type
pr-watson May 2, 2022
baafeca
Update Lib/test/test_functools.py
JelleZijlstra May 2, 2022
cf72d7e
fix indentation
JelleZijlstra May 2, 2022
f587878
Feedback from Serhiy
JelleZijlstra May 3, 2022
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43 changes: 43 additions & 0 deletions Lib/test/test_functools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2792,6 +2792,49 @@ def _(arg: int | float):
self.assertEqual(f(1), "types.UnionType")
self.assertEqual(f(1.0), "types.UnionType")

def test_union_conflict(self):
@functools.singledispatch
def f(arg):
return "default"

@f.register
def _(arg: typing.Union[str, bytes]):
return "typing.Union"

@f.register
def _(arg: int | str):
return "types.UnionType"

self.assertEqual(f([]), "default")
self.assertEqual(f(""), "types.UnionType") # last one wins
self.assertEqual(f(b""), "typing.Union")
self.assertEqual(f(1), "types.UnionType")

def test_union_None(self):
@functools.singledispatch
def typing_union(arg):
return "default"

@typing_union.register
def _(arg: typing.Union[str, None]):
return "typing.Union"

self.assertEqual(typing_union(1), "default")
self.assertEqual(typing_union(""), "typing.Union")
self.assertEqual(typing_union(None), "typing.Union")

@functools.singledispatch
def types_union(arg):
return "default"

@types_union.register
def _(arg: int | None):
return "types.UnionType"

self.assertEqual(types_union(""), "default")
self.assertEqual(types_union(1), "types.UnionType")
self.assertEqual(types_union(None), "types.UnionType")

def test_register_genericalias(self):
@functools.singledispatch
def f(arg):
Expand Down