code: @Test public void localtionTest(){
    BlockInfo tInfo=new BlockInfo(new InodeFile("t",100,0,Constants.DEFAULT_BLOCK_SIZE_BYTE,System.currentTimeMillis()),300,800);
    tInfo.addLocation(15,new NetAddress("abc",1));
    Assert.assertEquals(1,tInfo.getLocations().size());
    tInfo.addLocation(22,new NetAddress("def",2));
    Assert.assertEquals(2,tInfo.getLocations().size());
    tInfo.addLocation(29,new NetAddress("gh",3));
    Assert.assertEquals(3,tInfo.getLocations().size());
    tInfo.addLocation(15,new NetAddress("abc",1));
    Assert.assertEquals(3,tInfo.getLocations().size());
    tInfo.addLocation(22,new NetAddress("def",2));
    Assert.assertEquals(3,tInfo.getLocations().size());
    tInfo.addLocation(29,new NetAddress("gh",3));
    Assert.assertEquals(3,tInfo.getLocations().size());
    tInfo.removeLocation(15);
    Assert.assertEquals(2,tInfo.getLocations().size());
    tInfo.removeLocation(10);
    Assert.assertEquals(2,tInfo.getLocations().size());
  }
  