A simple TCP/UDP mock server for using in test projects which test .Net core based projects.

When I was working on Cimon.Net project, I realized that I can't mock sockets with existed libraries, So I changed my project to create fake sockets. But the problem still existed, So I started to write this project and finally I used this in Cimon.Net.

You can install Rony.Net with NuGet Package Manager Console:

Install-Package Rony.Net -Version 0.1.2

Or via the .NET Core command-line interface:

dotnet add package Rony.Net --version 0.1.2

With Rony.Net you can create 3 types of Server :

• TCP Server
• TCP Server with SSL/TLS support
• UDP Server

You can create and run mock servers as below. Port, IP and other settings are configurable via constructors :

using var tcpServer = new MockServer(new TcpServer(3000));
tcpSever.Start();

using var tcpSslServer = new MockServer(new TcpServerSsl(4000, certificateName, SslProtocols.None));
tcpSslServer.Start();

You must address a valid and installed certificate which you have read permission on its private key, and also you can set SslProtocol based on your requirements.

using var udpServer = new MockServer(new UdpServer(5000));

Please pay attention that UDP server does not need to start, because of its nature.

Then you can use a normal client to connect and sending request to them, just like below :

using var client = new TcpClient();
await client.ConnectAsync(IPAddress.Parse("127.0.0.1"), 3000);

var client = new UdpClient();
client.Connect(IPAddress.Parse("127.0.0.1"), 5000);

You can use mockServer.Mock to manage Send/Receive data, then server will return configured data, based on sent data:

mockServer.Mock.Send("Test String").Receive("Test Response");
mockServer.Mock.Send(new byte[] { 1, 2, 3 }).Receive(new byte[] { 3, 2, 1 });
mockServer.Mock.Send("abcd").Receive(x=> x.ToUpper());

An important option in using mockServer.Mock is adding Any request to it, then it will reply to any unconfigured request base on this config (verion 0.1.1 and later), you can config server for this option by using an empty string in Send() method, just like below :

mockServer.Mock.Send("").Receive("Test Response");

You can use mockServer.Mock either before or after mockServer.Run(). For more details please check Test projects.

You need at least Visual Studio 2019 (you can download the Community Edition for free).

All tests uses Xunit, for running TCP server with SSL/TLS, you should change _certificateName field to a certificate name on your machine. Please pay attention that you must have read permission on private key of certificate.