diff options
| -rw-r--r-- | Lib/test/test_typing.py | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py index 0bb9ada..a75dac4 100644 --- a/Lib/test/test_typing.py +++ b/Lib/test/test_typing.py @@ -10129,6 +10129,18 @@ class ConcatenateTests(BaseTestCase): self.assertEqual(C4.__args__, (Concatenate[int, T, P], T)) self.assertEqual(C4.__parameters__, (T, P)) + def test_invalid_uses(self): + with self.assertRaisesRegex(TypeError, 'Concatenate of no types'): + Concatenate[()] + with self.assertRaisesRegex( + TypeError, + ( + 'The last parameter to Concatenate should be a ' + 'ParamSpec variable or ellipsis' + ), + ): + Concatenate[int] + def test_var_substitution(self): T = TypeVar('T') P = ParamSpec('P') |