1. Testing servers

2. Testing a server: The idea
Start the server (manually)
[TestMethod]
Send a request to the server
Read the response from the server
Compare the response to your expectations
Assert.AreEqual(expected, response)
Stop the server (manually)
Example: EchoTcpServer
Note: Although we use a Unit test tool this is not unit testing. It is integration testing

3. Start and stop the server automatically
The test should be able to start and later stop the server automatically
The server should have methods Start() and Stop()
[ClassInitialize]
executed once - before the first [TestMethod]
[ClassCleanup]
Executed once - after the last [TestMethod]
Example: EchoTcpServer

4. Start and stop the server from the test
private const int Port = 14593; private static EchoServer _server; [ClassInitialize] public static void TestStart(TestContext context) { _server = new EchoServer(Port); Task.Run(() => _server.Start()); }
[ClassCleanup] public static void TestStop() { _server.Stop(); }

5. The servers Stop() method
Server refuses new connections
Existing connections (Tasks) must be given a chance to finish
Example: EchoTcpServer