def test_interface(self):
        verify.verifyObject(iwokkel.IPubSubClient, self.protocol)
Make sure that the Line Item for the SMS Rate has the following:
dataset/ETHPy150Open ralphm/wokkel/wokkel/test/test_pubsub.py/PubSubClientTest.test_interface--crossover with--dataset/ETHPy150Open dimagi/commcare-hq/corehq/apps/accounting/tests/test_invoicing.py/TestSmsLineItem.test_over_limit