### Question:
PayloadClient { public static Optional<String> startStopFormat(String aicIdentity) throws JsonProcessingException { StartStopAction payloadResult = new StartStopAction(); payloadResult.setAicIdentity(aicIdentity); return Optional.of(mapper.writeValueAsString(payloadResult)); } private  PayloadClient(); static Optional<String> upgradeFormat(Optional<String> payload, String vnfName); static Optional<String> distributeTrafficFormat(Optional<String> payload, String vnfName); static Optional<String> distributeTrafficCheckFormat(Optional<String> payload, String vnfName); static Optional<String> resumeTrafficFormat(String vnfName); static Optional<String> quiesceTrafficFormat(Optional<String> payload, String vnfName); static Optional<String> startStopFormat(String aicIdentity); static Optional<String> healthCheckFormat(String vnfName, String vnfHostIpAddress); static Optional<String> snapshotFormat(String vmId, String identityUrl);  }### Answer:
@Test public void startStopFormatTest() throws Exception { String payloadResult = "{\" AICIdentity \":\"aicIdentity1\"}"; Optional<String> payloadClient = PayloadClient.startStopFormat("aicIdentity1"); assertEquals(payloadResult, payloadClient.get()); }