### Question:
TaskAssigningPlanningKieServerExtension implements KieServerExtension { void registerExtractors(KieContainerInstanceImpl container) { LabelValueExtractorRegistry.getInstance().registerExtractors(container.getKieContainer().getClassLoader()); }  @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 serverStartedWithUserSystemContainerExistingAndStartedSuccessful() { prepareServerStartWithUserSystemContainerConfig(); when(registry.getContainer(USER_SYSTEM_CONTAINER_ID)).thenReturn(userSystemContainer); when(userSystemContainer.getStatus()).thenReturn(KieContainerStatus.STARTED); initAndStartServerSuccessful(); verify(extension).registerExtractors(userSystemContainer); }
@Test public void serverStartedWithUserSystemContainerExistingButNeedsActivationSuccessful() { prepareServerStartWithUserSystemContainerConfig(); prepareExistingContainerButNeedsActivationSuccessful(USER_SYSTEM_CONTAINER_ID, userSystemContainer); initAndStartServerSuccessful(); verify(extension).registerExtractors(userSystemContainer); }
@Test public void serverStartedWithUserSystemContainerNotExistingButCreatedSuccessful() { prepareServerStartWithUserSystemContainerConfig(); prepareContainerNotExistingButCreatedSuccessful(USER_SYSTEM_CONTAINER_ID, userSystemContainer); initAndStartServerSuccessful(); verify(extension).registerExtractors(userSystemContainer); }