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| author | James Hilton-Balfe <gobot1234yt@gmail.com> | 2022-03-08 03:50:46 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-03-08 03:50:46 (GMT) |
| commit | f391f9bf28f0bba7939d9f9e5a7a6396d2b0df62 (patch) | |
| tree | 4151190384181dca5446c61e6dd7c3230739a6e0 /Lib/test/test_typing.py | |
| parent | 50731297a9b6d57eec3b3f89522785b23f7b3e71 (diff) | |
| download | cpython-f391f9bf28f0bba7939d9f9e5a7a6396d2b0df62.zip cpython-f391f9bf28f0bba7939d9f9e5a7a6396d2b0df62.tar.gz cpython-f391f9bf28f0bba7939d9f9e5a7a6396d2b0df62.tar.bz2 | |
bpo-46170: Improve the error message when subclassing NewType (GH-30268)
Co-authored-by: Alex Waygood <alex.waygood@gmail.com>
Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
Diffstat (limited to 'Lib/test/test_typing.py')
| -rw-r--r-- | Lib/test/test_typing.py | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py index 17d78cf..c76aa0a 100644 --- a/Lib/test/test_typing.py +++ b/Lib/test/test_typing.py @@ -4423,6 +4423,17 @@ class NewTypeTests: ) exec(code, {}) + def test_error_message_when_subclassing(self): + with self.assertRaisesRegex( + TypeError, + re.escape( + "Cannot subclass an instance of NewType. Perhaps you were looking for: " + "`ProUserId = NewType('ProUserId', UserId)`" + ) + ): + class ProUserId(UserId): + ... + class NewTypePythonTests(NewTypeTests, BaseTestCase): module = py_typing |