@Override
      public void postLogRoll(Path oldFile, Path newFile) {
        LOG.debug("postLogRoll: oldFile=" + oldFile + " newFile=" + newFile);
        paths.add(newFile);
      }
Tests that the LogRoller perform the roll with some data in the log
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/AbstractTestLogRollPeriod.java