TDD 和模拟 TcpClient

问题描述

人们如何模拟 TcpClient(或 TcpClient 之类的东西)?

How do people approach mocking out TcpClient (or things like TcpClient)?

我有一个接收 TcpClient 的服务.我应该用其他更可笑的东西来包装它吗?我应该如何处理?

I have a service that takes in a TcpClient. Should I wrap that in something else more mockable? How should I approach this?

推荐答案

当要模拟对测试不友好的类(即密封/未实现任何接口/方法不是虚拟的)时，您可能希望使用 Adapter 设计模式.

When coming to mock classes that are not test friendly (i.e. sealed/not implementing any interface/methods are not virtual), you would probably want to use the Adapter design pattern.

在此模式中，您添加了一个实现接口的包装类.然后，您应该模拟该接口，并确保您的所有代码都使用该接口而不是不友好的具体类.它看起来像这样:

In this pattern you add a wrapping class that implements an interface. You should then mock the interface, and make sure all your code uses that interface instead of the unfriendly concrete class. It would look something like this:

public interface ITcpClient
{
   Stream GetStream(); 
   // Anything you need here       
}
public class TcpClientAdapter: ITcpClient
{
   private TcpClient wrappedClient;
   public TcpClientAdapter(TcpClient client)
   {
    wrappedClient = client;
   }

   public Stream GetStream()
   {
     return wrappedClient.GetStream();
   }
}

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