How to unit test code that uses HostingEnvironment.MapPath

Question

I have some code that uses HostingEnvironment.MapPath which I would like to unit test.

How can I setup HostingEnvironment so that it retur

Answer 1

Well I was writing a test today for code that I don't control and they used

    private static String GetApplicationPath()
    {
        return HostingEnvironment.ApplicationVirtualPath.TrimEnd('/');
    }

so here is a C# reflection hack to set that value

var path =  "/aaaa/bb";

HostingEnvironment hostingEnvironment;
if (HostingEnvironment.IsHosted.isFalse())
    new HostingEnvironment();

hostingEnvironment = (HostingEnvironment)typeof(HostingEnvironment).fieldValue("_theHostingEnvironment");

var virtualPath = "System.Web".assembly()
                   .type("VirtualPath").ctor();

virtualPath.field("_virtualPath", path);
//return virtualPath.prop("VirtualPathString");                
//return virtualPath.prop("VirtualPathStringNoTrailingSlash");                 

hostingEnvironment.field("_appVirtualPath", virtualPath);
//hostingEnvironment.field("_appVirtualPath") == virtualPath;

return HostingEnvironment.ApplicationVirtualPath == path;       

//using  System.Web.Hosting