from django.db.models.utils import create_namedtuple_class

from django.test import SimpleTestCase

class NamedTupleClassTests(SimpleTestCase):

    def test_immutability(self):

        row_class = create_namedtuple_class("field1", "field2")

        row = row_class("value1", "value2")

        with self.assertRaises(AttributeError):

            row.field3 = "value3"