### Question:
HBaseClient10 extends com.yahoo.ycsb.DB { @Override public Status update(String table, String key, Map<String, ByteIterator> values) { if (!tableName.equals(table)) { currentTable = null; try { getHTable(table); tableName = table; } catch (IOException e) { System.err.println("Error accessing HBase table: " + e); return Status.ERROR; } } if (debug) { System.out.println("Setting up put for key: " + key); } Put p = new Put(Bytes.toBytes(key)); p.setDurability(durability); for (Map.Entry<String, ByteIterator> entry : values.entrySet()) { byte[] value = entry.getValue().toArray(); if (debug) { System.out.println("Adding field/value " + entry.getKey() + "/" + Bytes.toStringBinary(value) + " to put request"); } p.addColumn(columnFamilyBytes, Bytes.toBytes(entry.getKey()), value); } try { if (clientSideBuffering) { bufferedMutator.mutate(p); } else { currentTable.put(p); } } catch (IOException e) { if (debug) { System.err.println("Error doing put: " + e); } return Status.ERROR; } catch (ConcurrentModificationException e) { return Status.ERROR; } return Status.OK; }  @Override void init(); @Override void cleanup(); void getHTable(String table); Status read(String table, String key, Set<String> fields,
      Map<String, ByteIterator> result); @Override Status scan(String table, String startkey, int recordcount,
      Set<String> fields, Vector<HashMap<String, ByteIterator>> result); @Override Status update(String table, String key,
      Map<String, ByteIterator> values); @Override Status insert(String table, String key,
                       Map<String, ByteIterator> values); @Override Status delete(String table, String key);  }### Answer:
@Test public void testUpdate() throws Exception{ final String key = "key"; final Map<String, String> input = new HashMap<String, String>(); input.put("column1", "value1"); input.put("column2", "value2"); final Status status = client.insert(tableName, key, StringByteIterator.getByteIteratorMap(input)); assertEquals(Status.OK, status); final Get get = new Get(Bytes.toBytes(key)); final Result result = this.table.get(get); assertFalse(result.isEmpty()); assertEquals(2, result.size()); for(final java.util.Map.Entry<String, String> entry : input.entrySet()) { assertEquals(entry.getValue(), new String(result.getValue(Bytes.toBytes(COLUMN_FAMILY), Bytes.toBytes(entry.getKey())))); } }