assertEquals(FtpConst.Replyes.REPLY_331, client.executeCommand(new CmdUser("admin")));
assertEquals(FtpConst.Replyes.REPLY_230, client.executeCommand(new CmdPass("admin")));
assertEquals(FtpConst.Replyes.REPLY_215, client.executeCommand(new CmdSyst()));
assertEquals(FtpConst.Replyes.REPLY_227, client.executeCommand(new CmdPasv()));
assertEquals(FtpConst.Replyes.REPLY_350, client.executeCommand(new CmdRest(9)));
CmdRetr cmdRetr = new CmdRetr("/production/test_file.txt");
assertEquals(FtpConst.Replyes.REPLY_226, client.executeCommand(cmdRetr));
byte[] fileContent = cmdRetr.getFileContent();