@Override
    public String toString() {
      return "FailureCaseDetails: [buf=" + Bytes.toStringBinary(buf, offset, length) + ", offset="
        + offset + ", " + "length=" + length + ", expectedMessage=" + expectedMessage
        + ", withtags=" + withTags + "]";
    }
Tests that getTimestamp() does always return the proper timestamp, even after updating it. See
HBASE-6265.
hbase-common/src/test/java/org/apache/hadoop/hbase/TestKeyValue.java