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POFaking a slow connect with TcpClient and Socket
 

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    <p>I'm attempting to write an integration test to prove that a TCP client will correctly time out if an attempt to connect to the server is too slow. I have a <code>FakeServer</code> class that opens a <code>Socket</code> and listens for incoming connections:</p> <pre><code>public sealed class FakeServer : IDisposable { ... public TimeSpan ConnectDelay { get; set; } public void Start() { this.CreateSocket(); this.socket.Listen(int.MaxValue); this.socket.BeginAccept(this.OnSocketAccepted, null); } private void CreateSocket() { var ip = new IPAddress(new byte[] { 0, 0, 0, 0 }); var endPoint = new IPEndPoint(ip, Port); this.socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); this.socket.Bind(endPoint); } private void OnSocketAccepted(IAsyncResult asyncResult) { Thread.Sleep(this.connectDelay); this.clientSocket = this.socket.EndAccept(asyncResult); } } </code></pre> <p>Notice my attempt to delay the success of the connection via a call to <code>Thread.Sleep()</code>. Unfortunately, this does not work:</p> <pre><code>[Fact] public void tcp_client_test() { this.fakeServer.ConnectDelay = TimeSpan.FromSeconds(20); var tcpClient = new TcpClient(); tcpClient.Connect("localhost", FakeServer.Port); } </code></pre> <p>In the test above, the call to <code>tcpClient.Connect()</code> succeeds immediately, before the server-side <code>OnSocketAccepted</code> method is even called. I've had a look around the APIs and I can't see any obvious way for me to inject some server-side logic that must finish before the connection from the client is established.</p> <p>Is there any way for me to fake a slow server/connection using <code>TcpClient</code> and <code>Socket</code>?</p>
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    1. USKevin Reid
    1. USKent Boogaart
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    1. CO+1 for actually testing bad/slow connections unlike the rest of the ignorant world :)
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    2. COYou could use a tool like NetLimiter to throttle the connection. Unfortunately not free.
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    3. COThere are quite a few questions on the SO/SE network that cover this topic. Many are specific to browsers or a particular OS (there are at least 2 for OS X), but [this one](http://stackoverflow.com/questions/1094760/network-tools-that-simulate-slow-network-connection), [this one](http://stackoverflow.com/questions/11488888/simulate-slow-internet-connection-on-a-real-device), and [this one](http://superuser.com/questions/297103/how-to-simulate-slow-internet-connection) should have solutions you might be able to use.
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      1. USLèse majesté
 

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