@Override
  public String toString() {
    return "DataChecksum(type=" + type +
      ", chunkSize=" + bytesPerChecksum + ")";
  }
@Test
  public void testToString() {
    assertEquals("DataChecksum(type=CRC32, chunkSize=512)",
        DataChecksum.newDataChecksum(DataChecksum.Type.CRC32, 512).toString());
  }