Map the route ( NOTE : this route should appear before the default route)
context.MapRoute( name: "app", url: "app/{controller}/{action}/{id}", defaults: new { controller = "Test", action = "Index", id = UrlParameter.Optional } );
Then use Url.Action like this (should give you / application):
@Url.Action("Index", "Test")
You can find the routes in the Global.asax.cs file.
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