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gh-90633: Improve error and docs for typing.assert_never (#91720)

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Closes #90633

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
This commit is contained in:
Jelle Zijlstra 2022-04-25 06:40:18 -07:00 • committed by GitHub
parent 9ff2f12c87
commit 93d280141c
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4 changed files with 37 additions and 2 deletions
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13
Lib/test/test_typing.py
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@ -223,6 +223,19 @@ class AssertNeverTests(BaseTestCase):
with self.assertRaises(AssertionError):
assert_never(None)
value = "some value"
with self.assertRaisesRegex(AssertionError, value):
assert_never(value)
# Make sure a huge value doesn't get printed in its entirety
huge_value = "a" * 10000
with self.assertRaises(AssertionError) as cm:
assert_never(huge_value)
self.assertLess(
len(cm.exception.args[0]),
typing._ASSERT_NEVER_REPR_MAX_LENGTH * 2,
)
class SelfTests(BaseTestCase):
def test_equality(self):