TDD on TCPClient and unwrap received message

Question

Here's my scenario.

I need to connect to a TCP Server and receive message from it. The message is encapsulated with start tag and end tag.

I want to implement it in TDD way, but I do not know where to start.

I have been doing the bowling game kata for some days now, but still can't apply it to real world case.

An example of it would be much appreciated.

Thanks.

Answer 1

make your server implement something like IServer, let's say with event SendData.

Have your client side class with injectable server. Example:

public class client{
readonly IServer _server;
public client(IServer server){this._server = server;}
}

All that remains is creating a client object with a mock IServer in your tests. Note: this is testing the behavior of your client, not testing network.

Also, to do TDD, start with a test method like this:

[TestMethod]
public void ClientReceivesData()
{
 var mockServer = new Mock<IServer>();//fails, makes you create the interface
 var client = new Client(mockServer.Object); // fails, makes you create client

 mockServer.Raise(s=>s.SendData+=null).Returns("test"); 
 // makes you create an event in the interface. Please check the syntax

 client.Listen(); 
 //makes you have some code on the client side to listen to server data.

 Assert.AreEqual("test", client.ReceivedData);// one of the many ways of asserting
}