mvc rout and get string

im begginer in asp.net mvc

i write this rout code

    routes.MapRoute(
        name: "test",
        url: "test/{name}",
        defaults: new { controller = "Home", action = "test"}
    );

and this controller

public ActionResult test(string data)
{                   

    switch (data)
    {
        case "test1":
            return View("test1");
        case "test2":
            return View("test2");
        case "test3":
            return View("test3");
        default:
            return View("test1");
    }

}

and in my url http://localhost:3598/test/test1

but i get null data in parameter in controller

how i can get 'test1' in switch (data) ?

thank you for your help