django/tests/modeltests/validation/validators.py

from modeltests.validation import ValidationTestCase
from models import *


class TestModelsWithValidators(ValidationTestCase):
    def test_custom_validator_passes_for_correct_value(self):
        mtv = ModelToValidate(number=10, name='Some Name', f_with_custom_validator=42)
        self.assertEqual(None, mtv.full_clean())

    def test_custom_validator_raises_error_for_incorrect_value(self):
        mtv = ModelToValidate(number=10, name='Some Name', f_with_custom_validator=12)
        self.assertFailsValidation(mtv.full_clean, ['f_with_custom_validator'])
        self.assertFieldFailsValidationWithMessage(
            mtv.full_clean,
            'f_with_custom_validator',
            [u'This is not the answer to life, universe and everything!']
        )