@Test
public void testPerform() throws Exception {

  final StormShutdownWarning shutdownWarning = new StormShutdownWarning();
  PrereqCheckRequest request = new PrereqCheckRequest(m_clusterName);
  PrerequisiteCheck check = new PrerequisiteCheck(null, null);
  shutdownWarning.perform(check, request);
  Assert.assertEquals(PrereqCheckStatus.WARNING, check.getStatus());
}