String decodedPdu = Strings.dumpBytes( buf.array() );
buf.flip();
ChangePasswdDataContainer container = new ChangePasswdDataContainer( buf );
decoder.decode( buf, container );
ChangePasswdData chngPwdData = container.getChngPwdData();
assertArrayEquals( "secret".getBytes(), chngPwdData.getNewPasswd() );