def METHOD_NAME(self):
    empty_data_examples = (
        {"foo": None, "bar": None},
        {"foo": None},
        {"foo": ""},
        {},
    )
    for empty_data in empty_data_examples:
        with self.subTest(data=empty_data):
            serializer = AllOrNoneTruthyFieldsValidatorSerializer(data=empty_data)
            is_valid = serializer.is_valid()
            self.assertTrue(is_valid)