### Question:
AlertDefinitionDAO { @Transactional public AlertDefinitionEntity merge(AlertDefinitionEntity alertDefinition) { AlertDefinitionEntity entity = entityManagerProvider.get().merge(alertDefinition); AlertDefinition definition = alertDefinitionFactory.coerce(entity); AlertDefinitionChangedEvent event = new AlertDefinitionChangedEvent( alertDefinition.getClusterId(), definition); eventPublisher.publish(event); return entity; }  @RequiresSession AlertDefinitionEntity findById(long definitionId); @RequiresSession AlertDefinitionEntity findByName(long clusterId, String definitionName); @RequiresSession List<AlertDefinitionEntity> findAll(); @RequiresSession List<AlertDefinitionEntity> findAll(long clusterId); @RequiresSession List<AlertDefinitionEntity> findAllEnabled(long clusterId); @RequiresSession List<AlertDefinitionEntity> findByIds(List<Long> definitionIds); @RequiresSession List<AlertDefinitionEntity> findByService(long clusterId,
      String serviceName); @RequiresSession List<AlertDefinitionEntity> findByServiceMaster(long clusterId,
      Set<String> services); @RequiresSession List<AlertDefinitionEntity> findByServiceComponent(long clusterId,
      String serviceName, String componentName); @RequiresSession List<AlertDefinitionEntity> findAgentScoped(long clusterId); @RequiresSession List<AlertDefinitionEntity> findBySourceType(Long clusterId, SourceType sourceType); @Transactional void create(AlertDefinitionEntity alertDefinition); @Transactional void refresh(AlertDefinitionEntity alertDefinition); @Transactional AlertDefinitionEntity merge(AlertDefinitionEntity alertDefinition); void createOrUpdate(AlertDefinitionEntity alertDefinition); @Transactional void remove(AlertDefinitionEntity alertDefinition); @Transactional void removeAll(long clusterId);  }### Answer:
@Test public void testMerge() { }