@Test
public void testPerform() throws Exception {

  final String upgradePackName = "upgrade_pack";
  final HostsMasterMaintenanceCheck hostsMasterMaintenanceCheck = new HostsMasterMaintenanceCheck();
  hostsMasterMaintenanceCheck.clustersProvider = new Provider<Clusters>() {
    @Override
    public Clusters get() {
      return clusters;
    }
  };
  hostsMasterMaintenanceCheck.repositoryVersionDaoProvider = new Provider<RepositoryVersionDAO>() {
    @Override
    public RepositoryVersionDAO get() {
      return repositoryVersionDAO;
    }
  };
  hostsMasterMaintenanceCheck.repositoryVersionHelper = new Provider<RepositoryVersionHelper>() {
    @Override
    public RepositoryVersionHelper get() {
      return repositoryVersionHelper;
    }
  };
  hostsMasterMaintenanceCheck.ambariMetaInfo = new Provider<AmbariMetaInfo>() {
    @Override
    public AmbariMetaInfo get() {
      return ambariMetaInfo;
    }
  };
  final Cluster cluster = Mockito.mock(Cluster.class);
  Mockito.when(cluster.getClusterId()).thenReturn(1L);
  Mockito.when(clusters.getCluster("cluster")).thenReturn(cluster);
  Mockito.when(cluster.getDesiredStackVersion()).thenReturn(new StackId("HDP", "1.0"));
  Mockito.when(repositoryVersionHelper.getUpgradePackageName(Mockito.anyString(), Mockito.anyString(), Mockito.anyString(), (UpgradeType) Mockito.anyObject())).thenReturn(null);
  PrerequisiteCheck check = new PrerequisiteCheck(null, null);
  hostsMasterMaintenanceCheck.perform(check, new PrereqCheckRequest("cluster"));
  Assert.assertEquals(PrereqCheckStatus.FAIL, check.getStatus());
  Mockito.when(repositoryVersionHelper.getUpgradePackageName(Mockito.anyString(), Mockito.anyString(), Mockito.anyString(), (UpgradeType) Mockito.anyObject())).thenReturn(upgradePackName);
  Mockito.when(ambariMetaInfo.getUpgradePacks(Mockito.anyString(), Mockito.anyString())).thenReturn(new HashMap<String, UpgradePack>());
  check = new PrerequisiteCheck(null, null);
  hostsMasterMaintenanceCheck.perform(check, new PrereqCheckRequest("cluster"));
  Assert.assertEquals(PrereqCheckStatus.FAIL, check.getStatus());
  final Map<String, UpgradePack> upgradePacks = new HashMap<String, UpgradePack>();
  final UpgradePack upgradePack = Mockito.mock(UpgradePack.class);
  Mockito.when(upgradePack.getName()).thenReturn(upgradePackName);
  upgradePacks.put(upgradePack.getName(), upgradePack);
  Mockito.when(ambariMetaInfo.getUpgradePacks(Mockito.anyString(), Mockito.anyString())).thenReturn(upgradePacks);
  Mockito.when(upgradePack.getTasks()).thenReturn(new HashMap<String, Map<String,ProcessingComponent>>());
  Mockito.when(cluster.getServices()).thenReturn(new HashMap<String, Service>());
  Mockito.when(clusters.getHostsForCluster(Mockito.anyString())).thenReturn(new HashMap<String, Host>());
  check = new PrerequisiteCheck(null, null);
  hostsMasterMaintenanceCheck.perform(check, new PrereqCheckRequest("cluster"));
  Assert.assertEquals(PrereqCheckStatus.PASS, check.getStatus());
}