public void Constructs_The_Correct_Message(int token, string directoryName)
        {
            var a   = new FolderContentsRequest(token, directoryName);
            var msg = a.ToByteArray();

            var reader = new MessageReader <MessageCode.Peer>(msg);
            var code   = reader.ReadCode();

            Assert.Equal(MessageCode.Peer.FolderContentsRequest, code);
            Assert.Equal(8 + 4 + 4 + directoryName.Length, msg.Length);
        }