code: /** 
   * Test add checkpoint
   * @throws Exception
   */
  @Test public void AddCheckpointTest() throws Exception {
    TestUtils.createByteFile(mTfs,"/xyz",WriteType.THROUGH,10);
    ClientFileInfo fInfo=mLocalTachyonCluster.getMasterInfo().getClientFileInfo("/xyz");
    String ckPath=fInfo.getCheckpointPath();
    mTfs.createFile("/xyz_ck",ckPath);
    ClientFileInfo ckFileInfo=mLocalTachyonCluster.getMasterInfo().getClientFileInfo("/xyz_ck");
    mLocalTachyonCluster.stop();
    AddCheckpointTestUtil(fInfo,ckFileInfo);
    String editLogPath=mLocalTachyonCluster.getEditLogPath();
    UnderFileSystem.get(editLogPath).delete(editLogPath,true);
    AddCheckpointTestUtil(fInfo,ckFileInfo);
  }
  