### Question:
ZSet extends RCollection { @Override public void delTtl(String key) throws KitDBException { checkTxStart(); try (CloseLock ignored = checkClose()) { LockEntity lockEntity = lock(key); byte[] key_b = getKey(key); try { MetaV metaV = getMetaP(key_b); if (metaV == null) { checkTxCommit(); return; } start(); delTimerCollection(KeyEnum.COLLECT_TIMER, metaV.getTimestamp(), key_b, metaV.convertMetaBytes().toBytesHead()); metaV.setTimestamp(-1); putDB(key_b, metaV.convertMetaBytes().toBytes(), SstColumnFamily.META); commit(); } finally { unlock(lockEntity); release(); } checkTxCommit(); } catch (KitDBException e) { checkTxRollBack(); throw e; } } protected  ZSet(DB db); void add(String key, byte[] v, long score); void add(String key, List<Entry> entryList); void addMayTTL(String key, int ttl, byte[] v, long score); boolean contains(String key, byte[] value); List<Entry> range(String key, long start, long end, int limit); List<Entry> rangeDel(String key, long start, long end, int limit); @Override @SuppressWarnings("unchecked") RIterator<ZSet> iterator(String key); void remove(String key, byte[]... vs); List<Long> score(String key, byte[]... vs); Long score(String key, byte[] v); @Override void delete(String key); @Override KeyIterator getKeyIterator(); void deleteFast(String key); @Override int getTtl(String key); @Override void delTtl(String key); @Override void ttl(String key, int ttl); @Override boolean isExist(String key); @Override int size(String key); @Override Entry getEntry(RocksIterator iterator); static String HEAD; static byte[] HEAD_B; static byte[] HEAD_SCORE_B; static byte[] HEAD_V_B; }### Answer:
@Test public void delTtl() { }