source: class CubeInstanceTest {
  
      private CubeInstance cubeInstance;
  
      @Test
      public void getTreeCuboidSchedulerTest() {
  
target:         Map<Long, Long> cuboidsWithRowCnt = cubeInstance.getCuboids();
          TreeCuboidScheduler.CuboidTree.createFromCuboids(Lists.newArrayList(cuboidsWithRowCnt.keySet()),
                  new TreeCuboidScheduler.CuboidCostComparator(cuboidsWithRowCnt));
  
          List<Long> cuboids = Lists.newArrayList(cuboidsWithRowCnt.keySet());
          Collections.sort(cuboids);
          for (Long cuboid : cuboids) {
              System.out.println(cuboid + ":" + cuboidsWithRowCnt.get(cuboid));
          }
          Assert.assertNotNull(cuboidsWithRowCnt.get(255L));
      }
  
  }