### Question:
ZSet extends RCollection { private void delete(byte[] key_b, MetaD metaD) { MetaV metaV = metaD.convertMetaV(); SData sData = new SData(key_b.length, key_b, metaV.getVersion(), null); deleteHead(sData.getHead(), SstColumnFamily.DEFAULT); ZData zData = new ZData(sData.getMapKeySize(), sData.getMapKey(), sData.getVersion(), 0, null); deleteHead(zData.getHead(), SstColumnFamily.DEFAULT); deleteDB(ArrayKits.addAll("D".getBytes(charset), key_b, metaD.getVersion()), SstColumnFamily.DEFAULT); } 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 delete() { }