@Test
  public void testRemoveUnfinishedLeftovers_multipleFolders_tooManyFinalRecords() throws Throwable {
    testRemoveUnfinishedLeftovers_multipleFolders_errorConditions(
        txn -> {
          List<File> logFiles = txn.logFiles();
          Assert.assertEquals(2, logFiles.size());

          // insert mismatched records
          FileUtils.append(logFiles.get(0), LogRecord.makeCommit(System.currentTimeMillis()).raw);
          FileUtils.append(logFiles.get(1), LogRecord.makeCommit(System.currentTimeMillis()).raw);
          FileUtils.append(logFiles.get(1), LogRecord.makeCommit(System.currentTimeMillis()).raw);
        },
        false);
  }
  @Test
  public void testRemoveUnfinishedLeftovers_multipleFolders_partialFinalRecords_second()
      throws Throwable {
    testRemoveUnfinishedLeftovers_multipleFolders_errorConditions(
        txn -> {
          List<File> logFiles = txn.logFiles();
          Assert.assertEquals(2, logFiles.size());

          // insert a full record and a partial one
          String finalRecord = LogRecord.makeCommit(System.currentTimeMillis()).raw;
          int toChop = finalRecord.length() / 2;
          FileUtils.append(logFiles.get(0), finalRecord);
          FileUtils.append(
              logFiles.get(1), finalRecord.substring(0, finalRecord.length() - toChop));
        },
        true);
  }
  @Test
  public void testRemoveUnfinishedLeftovers_multipleFolders_partialNonFinalRecord_second()
      throws Throwable {
    testRemoveUnfinishedLeftovers_multipleFolders_errorConditions(
        txn -> {
          List<File> logFiles = txn.logFiles();
          Assert.assertEquals(2, logFiles.size());

          // insert a partial sstable record and a full commit record
          String sstableRecord =
              LogRecord.make(LogRecord.Type.ADD, Collections.emptyList(), 0, "abc").raw;
          int toChop = sstableRecord.length() / 2;
          FileUtils.append(logFiles.get(0), sstableRecord);
          FileUtils.append(
              logFiles.get(1), sstableRecord.substring(0, sstableRecord.length() - toChop));
          String finalRecord = LogRecord.makeCommit(System.currentTimeMillis()).raw;
          FileUtils.append(logFiles.get(0), finalRecord);
          FileUtils.append(logFiles.get(1), finalRecord);
        },
        false);
  }
  @Test
  public void testRemoveUnfinishedLeftovers_multipleFolders_missingFinalRecords_second()
      throws Throwable {
    testRemoveUnfinishedLeftovers_multipleFolders_errorConditions(
        txn -> {
          List<File> logFiles = txn.logFiles();
          Assert.assertEquals(2, logFiles.size());

          // insert only one commit record
          FileUtils.append(logFiles.get(1), LogRecord.makeCommit(System.currentTimeMillis()).raw);
        },
        true);
  }