private static byte[] genValue(String row, String col, long version) {
    return Bytes.toBytes("Value:" + row + "#" + col + "#" + version);
  }
Callers must afterward call {@link HBaseTestingUtil#closeRegionAndWAL(HRegion)}
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestBlocksRead.java