Function test_config_validation_error_cause

tests/test_config.py:545–569

()

@pytest.mark.skipif(sys.version_info < (3, 11), reason='requires backport pre 3.11, fully tested in pydantic core')
def test_config_validation_error_cause():
    class Foo(BaseModel):
        foo: int

        @field_validator('foo')
        def check_foo(cls, v):
            assert v > 5, 'Must be greater than 5'

    # Should be disabled by default:
    with pytest.raises(ValidationError) as exc_info:
        Foo(foo=4)
    assert exc_info.value.__cause__ is None

    Foo.model_config = ConfigDict(validation_error_cause=True)
    Foo.model_rebuild(force=True)
    with pytest.raises(ValidationError) as exc_info:
        Foo(foo=4)
    # Confirm python error attached as a cause, and error location specified in a note:
    assert exc_info.value.__cause__ is not None
    assert isinstance(exc_info.value.__cause__, ExceptionGroup)  # noqa: F821
    assert len(exc_info.value.__cause__.exceptions) == 1
    src_exc = exc_info.value.__cause__.exceptions[0]
    assert repr(src_exc) == "AssertionError('Must be greater than 5\\nassert 4 > 5')"
    assert len(src_exc.__notes__) == 1
    assert src_exc.__notes__[0] == '\nPydantic: cause of loc: foo'


def test_config_defaults_match():