Unit Testing Code that calls VirtualPathUtility.ToAbsolute

Question

I'm trying to unit test some code that calls into VirtualPathUtility.ToAbsolute.

Is this possible with the unit testing tools provided with VS 2008? If not, is it possible with a later version of Visual Studio?

Answer 1

We're well past VS 2008 but for anyone who is still grappling with this issue, I've found a solution on: http://forums.asp.net/t/995143.aspx?Mocking+HTTPContext+object.

Use the following code in your test init to override the default AppDomain values. (The VirutalPathUtility static methods will use your new values.)

[TestInitialize]
public void Initialize()
{
    // Fake out env for VirtualPathUtility.ToAbsolute(..)
    string path = AppDomain.CurrentDomain.BaseDirectory; 
    const string virtualDir = "/";
    AppDomain.CurrentDomain.SetData(".appDomain", "*");
    AppDomain.CurrentDomain.SetData(".appPath", path);
    AppDomain.CurrentDomain.SetData(".appVPath", virtualDir);
    AppDomain.CurrentDomain.SetData(".hostingVirtualPath", virtualDir);
    AppDomain.CurrentDomain.SetData(".hostingInstallDir", HttpRuntime.AspInstallDirectory);
    TextWriter tw = new StringWriter();
    HttpWorkerRequest wr = new SimpleWorkerRequest("default.aspx", "", tw);
    HttpContext.Current = new HttpContext(wr);
}