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import sys
from dataclasses import dataclass
import pytest
from apischema import ValidationError, deserialization_method, deserialize, validator
def validate_checksum(b: bytes):
if b and sum(b[:-1]) % 255 != int(b[-1]):
raise ValidationError("Invalid checksum")
valid_bytes = b"toto" + (sum(b"toto") % 255).to_bytes(1, byteorder=sys.byteorder)
invalid_bytes = b"toto" + (sum(b"toto") % 255 + 42).to_bytes(1, byteorder=sys.byteorder)
def test_pass_through_run_upper_validators():
method = deserialization_method(
bytes, pass_through={bytes}, validators=[validate_checksum]
)
assert method(valid_bytes) is valid_bytes
with pytest.raises(ValidationError):
method(invalid_bytes)
@dataclass
class MyClass:
field: int
@validator
def field_is_not_zero(self):
if self.field == 0:
raise ValidationError("ZERO!")
def test_pass_through_doesnt_run_type_validators():
obj = MyClass(0)
method = deserialization_method(MyClass, pass_through={MyClass})
assert method(obj) is obj
with pytest.raises(ValidationError):
method({"fields": 0})
deserialize(MyClass, {"field": 0}, pass_through={MyClass})
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