### Question:
DLSN implements Comparable<DLSN> { public DLSN(long logSegmentSequenceNo, long entryId, long slotId) { this.logSegmentSequenceNo = logSegmentSequenceNo; this.entryId = entryId; this.slotId = slotId; } DLSN(long logSegmentSequenceNo, long entryId, long slotId); long getLogSegmentSequenceNo(); long getEntryId(); long getSlotId(); @Override int compareTo(DLSN that); byte[] serializeBytes(); byte[] serializeBytes(byte version); String serialize(); String serialize(byte version); static DLSN deserialize(String dlsn); static DLSN deserializeBytes(byte[] data); @Override String toString(); @Override boolean equals(Object o); @Override int hashCode(); DLSN getNextDLSN(); DLSN positionOnTheNextLedger(); static final byte VERSION0; static final byte VERSION1; static final DLSN InitialDLSN; static final DLSN NonInclusiveLowerBound; static final DLSN InvalidDLSN; }### Answer:
@Test(timeout = 60000) public void testDLSN() { DLSN dlsn = new DLSN(99L, 88L, 77L); String dlsnv0 = dlsn.serialize(DLSN.VERSION0); String dlsnv1 = dlsn.serialize(DLSN.VERSION1); String badDLSN = "baddlsn"; assertEquals(dlsn, DLSN.deserialize(dlsnv0)); assertEquals(dlsn, DLSN.deserialize(dlsnv1)); try { DLSN.deserialize(badDLSN); fail("Should fail on deserializing bad dlsn"); } catch (IllegalArgumentException iae) { } assertEquals(dlsn, DLSN.deserialize0(dlsnv0)); try { DLSN.deserialize0(dlsnv1); fail("Should fail on deserializing version one dlsn"); } catch (IllegalArgumentException iae) { } try { DLSN.deserialize0(badDLSN); fail("Should fail on deserializing bad dlsn"); } catch (IllegalArgumentException iae) { } }