### Question:
MockZis { public String createAckString() { SIF_Message message = new SIF_Message(); SIF_Ack ack = message.ackStatus(0); return sifElementToString(ack); }  void parseSIFMessage(String sifString); void broadcastMessage(String xmlMessage); @PostConstruct void setup(); String createAckString(); void getAgentUrls(Set<String> agentCallbackUrls); Set<String> getAgentUrls();  }### Answer:
@Test public void shouldCreateAckMessages() throws ADKException, IOException { String ackString = mockZis.createAckString(); SIFParser parser = SIFParser.newInstance(); SIFElement sifElem = parser.parse(ackString); Assert.assertTrue("Should create a SIF message", (sifElem instanceof SIF_Ack)); }