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from typing import Annotated, NewType
import pytest
from apischema import ValidationError, deserialize, validator
from apischema.metadata import validators
Palindrome = NewType("Palindrome", str)
@validator # could also use @validator(owner=Palindrome)
def check_palindrome(s: Palindrome):
for i in range(len(s) // 2):
if s[i] != s[-1 - i]:
raise ValidationError("Not a palindrome")
assert deserialize(Palindrome, "tacocat") == "tacocat"
with pytest.raises(ValidationError) as err:
deserialize(Palindrome, "palindrome")
assert err.value.errors == [{"loc": [], "err": "Not a palindrome"}]
# Using Annotated
with pytest.raises(ValidationError) as err:
deserialize(Annotated[str, validators(check_palindrome)], "palindrom")
assert err.value.errors == [{"loc": [], "err": "Not a palindrome"}]
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