@Test
 public void getChunkForBlockCoordinate() {
   assertEquals(-2, RegionUtil.getChunkForBlockCoordinate(-17));
   assertEquals(-1, RegionUtil.getChunkForBlockCoordinate(-16));
   assertEquals(-1, RegionUtil.getChunkForBlockCoordinate(-1));
   assertEquals(0, RegionUtil.getChunkForBlockCoordinate(0));
   assertEquals(0, RegionUtil.getChunkForBlockCoordinate(15));
   assertEquals(1, RegionUtil.getChunkForBlockCoordinate(16));
   assertEquals(1, RegionUtil.getChunkForBlockCoordinate(31));
   assertEquals(2, RegionUtil.getChunkForBlockCoordinate(32));
 }