ASP.NET MVC:使用UrlHelper的单元测试控制器

public class HomeController : Controller
{
    public ActionResult Index()
    {
        UrlHelper urlHelper = new UrlHelper(Request.RequestContext);
        string url = urlHelper.Action("About", "Home");
        return Content(url);
    }
}

[TestMethod]
public void TestIndex()
{
    // Arrange
    var controller = new HomeController();
    var request = new RequestContext();
    var urlHelper = new UrlHelper(request);
    controller.Url = urlHelper;

    // Act
    var result = controller.Index() as ContentResult;

    // Assert
    Assert.AreEqual("/Home/About", result.Content);
}