@Test
public void findByIdTest() {

    ClusterVO cluster = new ClusterVO();
    Mockito.doReturn(cluster).when(clusterDao).findById(Mockito.anyLong());
    ClusterVO result = spy.findById(0l);
    Mockito.verify(clusterDao).findById(Mockito.anyLong());
    Assert.assertEquals(cluster, result);
}