### Question:
ServicePluginFactory { public String preProcessService(ServiceDecomposition serviceDecomposition, String uuiRequest) { if (isSOTN(serviceDecomposition, uuiRequest)) { return preProcessSOTNService(serviceDecomposition, uuiRequest); } return uuiRequest; } private  ServicePluginFactory(); static synchronized ServicePluginFactory getInstance(); @SuppressWarnings("unchecked") String doProcessSiteLocation(ServiceDecomposition serviceDecomposition, String uuiRequest); @SuppressWarnings("unchecked") String doTPResourcesAllocation(DelegateExecution execution, String uuiRequest); Map getTPsfromAAI(String serviceName); String preProcessService(ServiceDecomposition serviceDecomposition, String uuiRequest); String doServiceHoming(ServiceDecomposition serviceDecomposition, String uuiRequest); static void main(String args[]); static String getJsonString(Object srcObj);  }### Answer:
@Test public void preProcessService_isSOTN() { String invalidJsonWithOnlyNeededValues = "\"clientSignal\":\"\",\"vpnType\":\"\"}"; String result = servicePluginFactory.preProcessService(null, invalidJsonWithOnlyNeededValues); Assert.assertEquals(result, invalidJsonWithOnlyNeededValues); }
@Test public void preProcessService() { String result = servicePluginFactory.preProcessService(null, uuiRequest); Assert.assertEquals(result, uuiRequest); }