C＃单元测试一个方法调用Console.ReadLine（） [英] C# unit test for a method which calls Console.ReadLine()

问题描述

我想为一个名为 ScoreBoard 的类的成员函数创建一个单元测试，该类存储一个游戏中的前五名玩家。

$ b $问题是，我创建了一个测试（ SignInScoreBoard ）的方法是调用 Console.ReadLine（），所以用户可以输入他们的名字：

  public void SignInScoreBoard（int steps）
 {
 if（topScored.Count< 5）
 {
 Console.Write（ASK_FOR_NAME_MESSAGE）; 
 string name = Console.ReadLine（）; 
 KeyValuePair< string，int> pair = new KeyValuePair< string，int>（name，steps）; 
 topScored.Insert（topScored.Count，pair）; 
} 
 else 
 {
 if（steps< topScored [4] .Value）
 {
 topScored.RemoveAt（4）; 
 Console.Write（ASK_FOR_NAME_MESSAGE）; 
 string name = Console.ReadLine（）; 
 topScored.Insert（4，new KeyValuePair< string，int>（name，steps））; 
} 
} 
} 
  

像十个用户，所以我可以检查是否五个用较少的移动（步骤）被存储？

解决方案

您需要将调用Console.ReadLine的代码行重构为单独的对象，

作为一个简单的例子，你可以像这样创建一个类：

  public class ConsoleNameRetriever {
 public virtual string GetNextName（）
 {
 return Console.ReadLine（）; 
} 
} 
  

然后，在您的方法中，重构它该类的实例。但是，在测试时，你可以用测试实现覆盖这个：

  public class TestNameRetriever：ConsoleNameRetriever {
 / /这应该给你的想法... 
 private string [] names = new string [] {Foo，Foo2，...}; 
 private int index = 0; 
 public override string GetNextName（）
 {
 return names [index ++]; 
} 
} 
  

测试时，实现。

授予，我个人使用一个框架使这更容易，并使用干净的接口，而不是这些实现，但希望上面是足够给你正确的想法...

I want to create a unit test for a member function of a class called ScoreBoard which is storing the top five players in a game.

The problem is that the method I created a test for (SignInScoreBoard) is calling Console.ReadLine() so the user can type their name:

public void SignInScoreBoard(int steps)
{
    if (topScored.Count < 5)
    {
        Console.Write(ASK_FOR_NAME_MESSAGE);
        string name = Console.ReadLine();
        KeyValuePair<string, int> pair = new KeyValuePair<string, int>(name, steps);
        topScored.Insert(topScored.Count, pair);
    }
    else
    {
        if (steps < topScored[4].Value)
        {
            topScored.RemoveAt(4);
            Console.Write(ASK_FOR_NAME_MESSAGE);
            string name = Console.ReadLine();
            topScored.Insert(4, new KeyValuePair<string, int>(name, steps));
        }
    }
}

Is there a way to insert like ten users so I can check if the five with less moves (steps) are being stored?

解决方案

You'll need to refactor the lines of code that call Console.ReadLine into a separate object, so you can stub it out with your own implementation in your tests.

As a quick example, you could just make a class like so:

public class ConsoleNameRetriever {
     public virtual string GetNextName()
     {
         return Console.ReadLine();
     }
}

Then, in your method, refactor it to take an instance of this class instead. However, at test time, you could override this with a test implementation:

public class TestNameRetriever : ConsoleNameRetriever {
     // This should give you the idea...
     private string[] names = new string[] { "Foo", "Foo2", ... };
     private int index = 0;
     public override string GetNextName()
     {
         return names[index++];
     }
}

When you test, swap out the implementation with a test implementation.

Granted, I'd personally use a framework to make this easier, and use a clean interface instead of these implementations, but hopefully the above is enough to give you the right idea...

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