@Test
public void testGetLongestDepth() {

    Stopwatch sw = new Stopwatch();
    Set<Long> cuboidSet1 = Sets.newHashSet(7L, 6L, 5L, 4L, 3L, 2L, 1L);
    sw.start();
    assertEquals(2, CuboidUtil.getLongestDepth(cuboidSet1));
    System.out.println("Time cost for GetLongestDepth: " + sw.elapsed(TimeUnit.MILLISECONDS) + "ms");
    Set<Long> cuboidSet2 = Sets.newHashSet(1024L, 1666L, 1667L, 1728L, 1730L, 1731L, 1760L, 1762L, 1763L, 1776L,
            1778L, 1779L, 1784L, 1788L, 1790L, 1791L, 1920L, 1922L, 1923L, 1984L, 1986L, 1987L, 2016L, 2018L, 2019L,
            2032L, 2034L, 2035L, 2040L, 2044L, 2046L, 2047L);
    sw.reset();
    sw.start();
    assertEquals(8, CuboidUtil.getLongestDepth(cuboidSet2));
    System.out.println("Time cost for GetLongestDepth: " + sw.elapsed(TimeUnit.MILLISECONDS) + "ms");
    Set<Long> cuboidSet3 = Sets.newHashSet(31L, 11L, 5L, 3L, 1L);
    sw.reset();
    sw.start();
    assertEquals(3, CuboidUtil.getLongestDepth(cuboidSet3));
    System.out.println("Time cost for GetLongestDepth: " + sw.elapsed(TimeUnit.MILLISECONDS) + "ms");
    sw.stop();
}