### Question:
RMap extends RCollection { private void delete(byte[] key_b, Meta meta) { MetaD metaD = meta.convertMetaBytes(); Key vkey = new Key(key_b.length, key_b, meta.getVersion(), null); deleteHead(vkey.getHead(), SstColumnFamily.DEFAULT); this.deleteDB(ArrayKits.addAll("D".getBytes(charset), key_b, metaD.getVersion()), SstColumnFamily.DEFAULT); } protected  RMap(DB db); void put(String key, String mkey, byte[] value); void putTTL(String key, String mkey, byte[] value, int ttl); void put(String key, Map<String, byte[]> map); void putMayTTL(String key, int ttl, Map<String, byte[]> map); void putMayTTL(String key, int ttl, String mkey, byte[] value); Map<String, byte[]> get(String key, String... keys); byte[] get(String key, String mkey); void remove(String key, String... keys); @Override void delete(String key); @Override KeyIterator getKeyIterator(); void deleteFast(String key); @Override RIterator<RMap> iterator(String key); @Override Entry getEntry(RocksIterator iterator); @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); static byte[] HEAD_B; final static byte[] HEAD_KEY_B; }### Answer:
@Test public void delete() throws KitDBException { }