code: @Test public void assertFailoverLeaderExecutionCallbackIfNotNecessary(){
    JobRegistry.getInstance().registerJob("test_job",jobScheduleController,regCenter);
    JobRegistry.getInstance().setJobRunning("test_job",false);
    when(jobNodeStorage.isJobNodeExisted("leader/failover/items")).thenReturn(false);
    failoverService.new FailoverLeaderExecutionCallback().execute();
    verify(jobNodeStorage).isJobNodeExisted("leader/failover/items");
    verify(jobNodeStorage,times(0)).getJobNodeChildrenKeys("leader/failover/items");
    JobRegistry.getInstance().shutdown("test_job");
  }
  