def METHOD_NAME(self):
    for value in [
        2,
        -2,
        2**256,
        2**260,
        25572735541615049941137326092682691158109824779649981270427004917341670006487,
        None,
    ]:
        uint256 = Uint256.objects.create(value=value)
        uint256.refresh_from_db()
        self.assertEqual(uint256.value, value)
    # Overflow
    with self.assertRaises(Exception):
        value = 2**263
        Uint256.objects.create(value=value)