django/tests/model_utils/tests.py

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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'