Unit testing for controller

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C#

MVC

i want to create unit test for controller. in my controller i have following codes...


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace Crossover.SmallApps.Controllers
{
public class SkillsController : Controller
{
//
// GET: /Skills/

public ActionResult Index(int? id)
{
if (id.HasValue)
return View(DBHelper.Skills.Select(id.Value));
return View();

}
public JsonResult All(int? id)
{

return Json(DBHelper.Skills.Select());
}

public JsonResult Details(int id)
{
return Json(DBHelper.Skills.Select(id));
}
public ActionResult Update(Utility.Entity.Skills skills)
{
Utility.Entity.Skills obj = DBHelper.Skills.Select(skills.Id);
obj.Name = skills.Name;
DBHelper.Skills.Update(obj);
return new HttpStatusCodeResult(200, "OK");

}
public ActionResult Add(Utility.Entity.Skills skills)
{
DBHelper.Skills.Add(new Utility.Entity.Skills
{
Name=skills.Name
});
return new HttpStatusCodeResult(200, "OK");

}

}
}


what i want is to create unit testing for all methods above.your little help will be great help for me thankyou... :)