def test_get_prep_value_convert(self):
        field = StringListField('testing')

        self.assertEqual(field.get_prep_value(["A", "B", "C"]), '["A", "B", "C"]')

        with self.assertRaises(ValueError):
            field.get_prep_value(5)
    def test_get_prep_value_convert(self):
        field = StringListField('testing')

        self.assertEqual(field.get_prep_value(["A", "B", "C"]), 'A,B,C')
        self.assertEqual(field.get_prep_value(["A", "B,C", "D"]), 'A,"B,C",D')

        with self.assertRaises(ValueError):
            field.get_prep_value(5)