@Override
    public String toString() {
        return toStringHelper(getClass())
                .add("securityParamIndex", Integer.toString(securityParamIndex))
                .add("sequence", Integer.toString(sequence))
                .toString();
    }
@Test
    public void testToStringESP() throws Exception {
        EncapSecurityPayload esp = deserializer.deserialize(bytePacket, 0, bytePacket.length);
        String str = esp.toString();

        assertTrue(StringUtils.contains(str, "securityParamIndex=" + 0x13572468));
        assertTrue(StringUtils.contains(str, "sequence=" + 0xffff00));
    }