private void writerWALFile(Path file, List<FSWALEntry> entries)
    throws IOException, StreamLacksCapabilityException {
    fs.mkdirs(file.getParent());
    ProtobufLogWriter writer = new ProtobufLogWriter();
    writer.init(fs, file, conf, true, WALUtil.getWALBlockSize(conf, fs, file),
      StreamSlowMonitor.create(conf, "testMonitor"));
    for (FSWALEntry entry : entries) {
      writer.append(entry);
    }
    writer.sync(false);
    writer.close();
  }
Run the split. Verify only single split file made.
@return The single split file made
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/AbstractTestWALReplay.java