code: /** 
   * Test file and folder creation and deletion;
   * @throws Exception
   */
  @Test public void DeleteTest() throws Exception {
    for (int i=0; i < 10; i++) {
      mTfs.mkdir("/i" + i);
      for (int j=0; j < 10; j++) {
        mTfs.createFile("/i" + i + "/j"+ j,(i + j + 1) * 64);
        if (j >= 5) {
          mTfs.delete("/i" + i + "/j"+ j,false);
        }
      }
      if (i >= 5) {
        mTfs.delete("/i" + i,true);
      }
    }
    mLocalTachyonCluster.stop();
    DeleteTestUtil();
    String editLogPath=mLocalTachyonCluster.getEditLogPath();
    UnderFileSystem.get(editLogPath).delete(editLogPath,true);
    DeleteTestUtil();
  }
  