django/tests/modeltests/validation/test_custom_messages.py

from modeltests.validation import ValidationTestCase
from models import CustomMessagesModel


class CustomMessagesTest(ValidationTestCase):
    def test_custom_simple_validator_message(self):
        cmm = CustomMessagesModel(number=12)
        self.assertFieldFailsValidationWithMessage(cmm.full_clean, 'number', ['AAARGH'])

    def test_custom_null_message(self):
        cmm = CustomMessagesModel()
        self.assertFieldFailsValidationWithMessage(cmm.full_clean, 'number', ['NULL'])