### Question:
CommonUtil { public static boolean addDefaultHandlersIfNotAvailable(Registry configSystemRegistry) throws RegistryException, FileNotFoundException, XMLStreamException { if (!configSystemRegistry.resourceExists(RegistryConstants.HANDLER_CONFIGURATION_PATH)) { Collection handlerConfigurationCollection = new CollectionImpl(); String description = "Handler configurations are stored here."; handlerConfigurationCollection.setDescription(description); configSystemRegistry.put(RegistryConstants.HANDLER_CONFIGURATION_PATH, handlerConfigurationCollection); } else { Resource handlerRoot = configSystemRegistry.get(getContextRoot()); if (!(handlerRoot instanceof Collection)) { String msg = "Failed to continue as the handler configuration root: " + getContextRoot() + " is not a collection."; log.error(msg); throw new RegistryException(msg); } Collection handlerRootCol = (Collection)handlerRoot; String[] handlerConfigPaths = handlerRootCol.getChildren(); if (handlerConfigPaths != null) { for (String handlerConfigPath: handlerConfigPaths) { generateHandler(configSystemRegistry, handlerConfigPath); } } } return true; }  static synchronized void setRegistryService(RegistryService service); static RegistryService getRegistryService(); static void simulateRegistryOperation(Registry rootRegistry, SimulationRequest simulationRequest); static SimulationResponse getSimulationResponse(); static boolean updateHandler(Registry configSystemRegistry, String oldName, String payload); static boolean addHandler(Registry configSystemRegistry, String payload); static boolean handlerExists(Registry configSystemRegistry, String name); static boolean deleteHandler(Registry configSystemRegistry, String name); static String getHandlerConfiguration(Registry configSystemRegistry, String name); static String[] getHandlerList(Registry configSystemRegistry); static String getContextRoot(); static void setContextRoot(String contextRoot); static boolean generateHandler(Registry configSystemRegistry, String resourceFullPath); static boolean removeHandler(Registry configSystemRegistry, String handlerName); static boolean isHandlerNameInUse(String name); static boolean addDefaultHandlersIfNotAvailable(Registry configSystemRegistry); static SimulationService getSimulationService(); static void setSimulationService(SimulationService simulationService); static HandlerConfigurationBean deserializeHandlerConfiguration(OMElement configurationElement); static OMElement serializeHandlerConfiguration(HandlerConfigurationBean bean);  }### Answer:
@Test public void testAddDefaultHandlersIfNotAvailable() throws Exception { assertTrue(CommonUtil.addDefaultHandlersIfNotAvailable(registry)); }