@After
 public void teardown() throws Exception {
   if (pipelineWithTwoStages != null) {
     pipelineWithTwoStages.onTearDown();
   }
   dbHelper.onTearDown();
   pipelineScheduleQueue.clear();
   testRepo.tearDown();
   FileUtil.deleteFolder(new File("pipelines"));
   configHelper.onTearDown();
 }