#fixed code
                              @Test
  public void testZeroSizeInProgressFile() throws Exception {
    final RaftStorage storage = RaftStorageTestUtils.newRaftStorage(storageDir);
    final File file = storage.getStorageDir().getOpenLogFile(0);
    storage.close();

    // create zero size in-progress file
    LOG.info("file: " + file);
    Assert.assertTrue(file.createNewFile());
    final Path path = file.toPath();
    Assert.assertTrue(Files.exists(path));
    Assert.assertEquals(0, Files.size(path));

    // getLogSegmentFiles should remove it.
    final List<RaftStorageDirectory.LogPathAndIndex> logs = storage.getStorageDir().getLogSegmentFiles();
    Assert.assertEquals(0, logs.size());
    Assert.assertFalse(Files.exists(path));
  }
#vulnerable code 
                              @Test
  public void testZeroSizeInProgressFile() throws Exception {
    final RaftStorage storage = new RaftStorage(storageDir, StartupOption.REGULAR);
    final File file = storage.getStorageDir().getOpenLogFile(0);
    storage.close();

    // create zero size in-progress file
    LOG.info("file: " + file);
    Assert.assertTrue(file.createNewFile());
    final Path path = file.toPath();
    Assert.assertTrue(Files.exists(path));
    Assert.assertEquals(0, Files.size(path));

    // getLogSegmentFiles should remove it.
    final List<RaftStorageDirectory.LogPathAndIndex> logs = storage.getStorageDir().getLogSegmentFiles();
    Assert.assertEquals(0, logs.size());
    Assert.assertFalse(Files.exists(path));
  } 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE