ASP.Net寻找如何为MVC操作单元测试代码的指导

Question

道歉在这里发布这个问题，但我突然遇到问题，因为我需要编写单元测试代码，以便我不好的行动。

我对asp.net mvc有点熟悉。在我从未编写单元测试代码进行操作之前，我会手动测试操作。现在我想知道为我的行动编写单元测试代码的艺术。所以我阅读了关于单元测试的几篇文章，但是请注意所有文章分享关于在mvc控制器中为动作方法编写单元测试代码的非常基本的想法但是我无法为我的动作编写单元测试代码。所以我在这里粘贴我的一个样本控制器和他们的行为。所以任何人请分享知识如何为我的行动方法编写单元测试代码。如果可能，请与代码示例或良好提示进行讨论，以便在VS2013和MVC版本5中编写单元测试代码。

这是我的代码

public class StudentController : Controller
    {
        private StudentRepository _Studentdata;
        private StateRepository _Statedata;
        private CityRepository _Citydata;

        public StudentController()
        {

            _Studentdata = new StudentRepository(System.Configuration.ConfigurationManager.ConnectionStrings["StudentDBContext"].ConnectionString);
            _Statedata = new StateRepository(System.Configuration.ConfigurationManager.ConnectionStrings["StudentDBContext"].ConnectionString);
            _Citydata = new CityRepository(System.Configuration.ConfigurationManager.ConnectionStrings["StudentDBContext"].ConnectionString);

            //_Studentdata = new StudentRepository(System.Configuration.ConfigurationManager.ConnectionStrings["StudentSQLDBContext"].ConnectionString);
            //_Statedata = new StateRepository(System.Configuration.ConfigurationManager.ConnectionStrings["StudentSQLDBContext"].ConnectionString);
            //_Citydata = new CityRepository(System.Configuration.ConfigurationManager.ConnectionStrings["StudentSQLDBContext"].ConnectionString);

        }

        // GET: Stuent
        public ActionResult List(StudentListViewModel oSVm)
        {
            if (Request.IsAjaxRequest())
                System.Threading.Thread.Sleep(1000); // just simulate delay of one second

            StudentListViewModel SVm = new StudentListViewModel();
            SVm.SetUpParams(oSVm);
            SVm.Students = _Studentdata.GetStudents(oSVm.page, oSVm.PageSize, oSVm.sort, oSVm.sortdir).ToList();
            SVm.States = _Statedata.GetAll().ToList();
            SVm.Cities = _Citydata.GetAll().ToList();
            SVm.RowCount = _Studentdata.DataCounter;
            return View("ListStudents",SVm);
        }

        [HttpPost]
        public ActionResult UpdateStudents(StudentListViewModel oSVm, string Action)
        {
            if (Request.IsAjaxRequest())
                System.Threading.Thread.Sleep(1000); // just simulate delay of one second

            StudentListViewModel SVm = new StudentListViewModel();
            SVm.SetUpParams(oSVm);
            if (Action == "UPDATE")
            {
                SVm.Students = _Studentdata.SaveXML(new List<Student>(oSVm.Students).ToXml("Students"),
                    oSVm.page, oSVm.PageSize, oSVm.sort, oSVm.sortdir).ToList();
            }
            else if (Action == "DELETE")
            {
                SVm.Students = _Studentdata.Delete(oSVm.Students[0].ID,
                    oSVm.page, oSVm.PageSize, oSVm.sort, oSVm.sortdir).ToList();

            }

            SVm.States = _Statedata.GetAll().ToList();
            SVm.Cities = _Citydata.GetAll().ToList();
            SVm.RowCount = _Studentdata.DataCounter;
            return PartialView("_StudentGrid", SVm);
        }

        [HttpPost]
        public ActionResult RefreshStudents(StudentListViewModel oSVm)
        {
            if (Request.IsAjaxRequest())
                System.Threading.Thread.Sleep(1000); // just simulate delay of one second

            StudentListViewModel SVm = new StudentListViewModel();
            SVm.SetUpParams(oSVm);
            SVm.Students = _Studentdata.GetStudents(oSVm.page, oSVm.PageSize, oSVm.sort, oSVm.sortdir).ToList();
            SVm.States = _Statedata.GetAll().ToList();
            SVm.Cities = _Citydata.GetAll().ToList();
            SVm.RowCount = _Studentdata.DataCounter;
            return PartialView("_StudentGrid", SVm);
        }

        [HttpGet]
        public JsonResult GetCityName(int StateID)
        {
            if (Request.IsAjaxRequest())
                System.Threading.Thread.Sleep(1000); // just simulate delay of one second

            return Json(new {CityList =_Citydata.GetCityByStateId(StateID)} , JsonRequestBehavior.AllowGet);
        }

    }

由于