Unit testing for Server.MapPath

Question

I\'ve a method. which retrieve a document from hard disk. I can\'t test this from unit testing. It always throw an exception invalid null path or something. How to test that

Answer 1

If you need to test legacy code which you can't or don't want to change, you can try FakeHttpContext.

This is how it works:

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