### Question:
AAIDeleteTasks { public void deleteInstanceGroupVnf(BuildingBlockExecution execution) { try { InstanceGroup instanceGroup = extractPojosForBB.extractByKey(execution, ResourceKey.INSTANCE_GROUP_ID); aaiInstanceGroupResources.deleteInstanceGroup(instanceGroup); } catch (Exception ex) { logger.error("Exception occurred in AAIDeleteTasks deleteInstanceGroupVnf process", ex); exceptionUtil.buildAndThrowWorkflowException(execution, 7000, ex); } }  void deleteVfModule(BuildingBlockExecution execution); void deleteVnf(BuildingBlockExecution execution); void deleteServiceInstance(BuildingBlockExecution execution); void deleteNetwork(BuildingBlockExecution execution); void deleteCollection(BuildingBlockExecution execution); void deleteInstanceGroup(BuildingBlockExecution execution); void deleteVolumeGroup(BuildingBlockExecution execution); void deleteConfiguration(BuildingBlockExecution execution); void deleteInstanceGroupVnf(BuildingBlockExecution execution); void deleteNetworkPolicies(BuildingBlockExecution execution);  }### Answer:
@Test public void deleteInstanceGroupVnfTest() throws Exception { doNothing().when(aaiInstanceGroupResources).deleteInstanceGroup(instanceGroup); aaiDeleteTasks.deleteInstanceGroupVnf(execution); verify(aaiInstanceGroupResources, times(1)).deleteInstanceGroup(instanceGroup); }