File: test_picklable.py

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import pickle
from unittest import TestCase

from django.core.exceptions import ValidationError


class PickableValidationErrorTestCase(TestCase):

    def test_validationerror_is_picklable(self):
        original = ValidationError('a', code='something')
        unpickled = pickle.loads(pickle.dumps(original))
        self.assertIs(unpickled, unpickled.error_list[0])
        self.assertEqual(original.message, unpickled.message)
        self.assertEqual(original.code, unpickled.code)

        original = ValidationError('a', code='something')
        unpickled = pickle.loads(pickle.dumps(ValidationError(original)))
        self.assertIs(unpickled, unpickled.error_list[0])
        self.assertEqual(original.message, unpickled.message)
        self.assertEqual(original.code, unpickled.code)

        original = ValidationError(['a', 'b'])
        unpickled = pickle.loads(pickle.dumps(original))
        self.assertEqual(original.error_list[0].message, unpickled.error_list[0].message)
        self.assertEqual(original.error_list[1].message, unpickled.error_list[1].message)

        original = ValidationError(['a', 'b'])
        unpickled = pickle.loads(pickle.dumps(ValidationError(original)))
        self.assertEqual(original.error_list[0].message, unpickled.error_list[0].message)
        self.assertEqual(original.error_list[1].message, unpickled.error_list[1].message)

        original = ValidationError([ValidationError('a'), ValidationError('b')])
        unpickled = pickle.loads(pickle.dumps(original))
        self.assertIs(unpickled.args[0][0], unpickled.error_list[0])
        self.assertEqual(original.error_list[0].message, unpickled.error_list[0].message)
        self.assertEqual(original.error_list[1].message, unpickled.error_list[1].message)

        message_dict = {'field1': ['a', 'b'], 'field2': ['c', 'd']}
        original = ValidationError(message_dict)
        unpickled = pickle.loads(pickle.dumps(original))
        self.assertEqual(unpickled.message_dict, message_dict)