如何在C＃中的单元测试的MapPath [英] How to MapPath in a unit test in C#

问题描述

我要加载外部XML文件中的一个单元测试来测试上一些XML处理代码。 ？如何获取该文件的路径

I want to load an external XML file in a unit test to test some processing code on that XML. How do I get the path of the file?

通常在一个web应用程序，我会做：

Usually in a web app I would do:

XDocument.Load(Server.MapPath("/myFile.xml"));

但很明显，在我的单元测试我有没有提到服务器或HttpContext的，所以我怎么能映射路径？这样我就不必指定完整路径

But obviously in my unit test I have no reference to Server or HttpContext so how can I map a path so that I don't have to specify the full path?

更新：

我只想说清楚，我实际测试的代码是一个XML解析器类，是这样的：

I just want to make it clear that the code I'm actually testing is for an XML parser class, something like:

public static class CustomerXmlParser {
  public static Customer ParseXml(XDocument xdoc) {
    //...
  }
}

因此，为了测试这个我需要解析一个有效的XDocument。被测试的方法不访问文件系统本身。我可以从一个字符串直接在测试代码创建的XDocument，但我认为这将是容易只是从文件中加载它。

So to test this I need to parse a valid XDocument. The method being tested does not access the file system itself. I could create the XDocument from a String directly in the test code but I thought it would be easier to just load it from a file.

推荐答案

另一个想法是利用依赖注入。

Another idea would be to utilize dependency injection.

public interface IPathMapper {
string MapPath(string relativePath);
}

，然后只需用2实施

And then simply use 2 implementations

public class ServerPathMapper : IPathMapper {
     public string MapPath(string relativePath){
          return HttpContext.Current.Server.MapPath(relativePath);
     }
}

和则还需要你的模拟实现。

And then you also need your mock implementation

public class DummyPathMapper : IPathMapper {
    public string MapPath(string relativePath){
        return "C:/Basedir/" + relativePath;
    }
}

然后所有的功能需要映射路径的会只需访问IPathMapper的一个实例 - 在你的web应用程序，它需要是ServerPathMapper和单元测试的DummyPathMapper - 基本DI（依赖注入）

And then all your functions that needs to map path's would simply need to have access to an instance of IPathMapper - in your web app it needs to be the ServerPathMapper and in your unit tests the DummyPathMapper - basic DI (Dependency Injection).

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