### Question:
TaskAssigningPlanningKieServerExtension implements KieServerExtension { @Override public List<Object> getAppComponents(SupportedTransports type) { return new ArrayList<>(); }  @Override boolean isActive(); @Override void init(KieServerImpl kieServer, KieServerRegistry registry); @Override boolean isInitialized(); @Override void createContainer(String id, KieContainerInstance kieContainerInstance, Map<String, Object> parameters); @Override void updateContainer(String id, KieContainerInstance kieContainerInstance, Map<String, Object> parameters); @Override boolean isUpdateContainerAllowed(String id, KieContainerInstance kieContainerInstance, Map<String, Object> parameters); @Override void disposeContainer(String id, KieContainerInstance kieContainerInstance, Map<String, Object> parameters); @Override List<Object> getAppComponents(SupportedTransports type); @Override T getAppComponents(Class<T> serviceType); @Override String getImplementedCapability(); @Override List<Object> getServices(); @Override String getExtensionName(); @Override Integer getStartOrder(); @Override String toString(); @Override void serverStarted(); @Override void destroy(KieServerImpl kieServer, KieServerRegistry registry); @Override List<Message> healthCheck(boolean report);  }### Answer:
@Test public void getAppComponents() { System.setProperty(TASK_ASSIGNING_USER_SYSTEM_NAME, USER_SYSTEM_NAME); enableExtension(); extension.init(kieServer, registry); assertThat(extension.getAppComponents(TaskAssigningService.class)).isNotNull(); }