Server.MapPath的单元测试

Question

我有一个方法.从硬盘检索文档.我不能通过单元测试来测试这个.它总是抛出异常无效的空路径或其他东西.如何测试.我暂时创建了单元测试会话.但我不能为这个Server.MapPath.怎么做 ？

Answer 1

You can use dependancy injection and abstraction over Server.MapPath

public interface IPathProvider
{
   string MapPath(string path);
}

And production implementation would be:

public class ServerPathProvider : IPathProvider
{
     public string MapPath(string path)
     {
          return HttpContext.Current.Server.MapPath(path);
     }
}

While testing one:

public class TestPathProvider : IPathProvider
{
    public string MapPath(string path)
    {
        return Path.Combine(@"C:\project\",path);
    }
}

Answer 2

如果您需要测试您不能或不想更改的遗留代码,可以尝试FakeHttpContext.

这是它的工作原理:

var expectedPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "path");
using (new FakeHttpContext())
{
    var mappedPath = Http.Context.Current.Server.MapPath("path");
    Assert.Equal(expectedPath, mappedPath);
}