Во время выполнения тестового проекта получение system.nullreferenceexception: ссылка на объект не установлена на экземпляр объекта.

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Это тестовый проект

public class UnitTest1
    {

        //private ProductRepository<iproductrepository> repository;
        //private ProductRepository<iproductdaterepository> productDateRepositor;
        private IProductRepository productRepository;
        private IProductDateRepository productDateRepository;
        public ProductController productController;
        List<productmodel> list;

        [TestInitialize]
        public void setUpController()
        {
            //repository = new ProductRepository<iproductrepository>();
            //productDateRepositor = new ProductRepository<iproductdaterepository>();
            productController = new ProductController(productRepository, productDateRepository);
            list = new List<productmodel>()
            {
                 new ProductModel(){Id=1,tickersymbol = "AAP", Price = 11100 ,Date=DateTime.Parse("12/25/2018") },
                new ProductModel(){Id=2,tickersymbol = "DAL", Price = 22200,Date=DateTime.Parse("11/27/2018")},
                new ProductModel(){Id=3,tickersymbol = "GE", Price = 33300,Date=DateTime.Parse("12/26/2018")},
                new ProductModel(){Id=4,tickersymbol = "AMZN", Price = 44400,Date=DateTime.Parse("11/27/2018")},
                new ProductModel(){Id=5,tickersymbol = "FNB", Price = 55500,Date=DateTime.Parse("12/28/2018")},
            };


        }
        [TestMethod]
        public void Index()
        {
            

            //Arrange
            var controller = productController;
            //Act
            
            var result = controller.Index("AAP") as ViewResult;
            var tickerdetails = (ProductModel)result.ViewData.Model;

            //Assert
            Assert.AreEqual("AAP",tickerdetails.tickersymbol );
            
        }

Во время выполнения этого я получаю сообщение: тестовый метод UnitTestProject2.UnitTest1.Index выбросил исключение:
System.NullReferenceException: ссылка на объект не установлена на экземпляр объекта.

Что я уже пробовал:

Это и есть хранилище

public class ProductRepository : IProductRepository,IProductDateRepository
    {
        private List<productmodel> _products;

        public ProductRepository()
        {
            _products = new List<productmodel>()
            {
                // Add products for the Demonstration
                new ProductModel(){Id=1,tickersymbol = "AAP", Price = 11100 ,Date=DateTime.Parse("12/25/2018") },
                new ProductModel(){Id=2,tickersymbol = "DAL", Price = 22200,Date=DateTime.Parse("11/27/2018")},
                new ProductModel(){Id=3,tickersymbol = "GE", Price = 33300,Date=DateTime.Parse("12/26/2018")},
                new ProductModel(){Id=4,tickersymbol = "AMZN", Price = 44400,Date=DateTime.Parse("11/27/2018")},
                new ProductModel(){Id=5,tickersymbol = "FNB", Price = 55500,Date=DateTime.Parse("12/28/2018")},

            };
        }

        public IEnumerable<productmodel> GetPrice(string Name, DateTime? Date)
        {
            if (Date != null && Name!="")
            {
                var product = _products.Where(x => x.tickersymbol.StartsWith(Name) && x.Date == Date).ToList();
                return product;
            }
            else
            {
                return _products.ToList();
            }
        }

        ProductModel IProductRepository.Get(int id)
        {
            return _products.Find(p => p.Id == id);
        }

        IEnumerable<productmodel> IProductRepository.GetAll(string Name)
        {
            if (Name != "")
            {
                var product = _products.Where(x => x.tickersymbol.StartsWith(Name) || Name == null).ToList();
                return product;
            }
            else
            {
                return _products.ToList();
            }

        }

        IEnumerable<productmodel> IProductRepository.GetAll()
        {
            return _products.ToList();
        }


    }

Controller
public class ProductController : Controller
    {
        private readonly IProductRepository _repository;
        private readonly IProductDateRepository _productDateRepository;
        
        public ProductController(IProductRepository repository, IProductDateRepository productDateRepositor)
        {
            _repository = repository;
            _productDateRepository = productDateRepositor;
        }


        public ActionResult Index()
        {

            var model = _repository.GetAll();
            return View(model);
        }
        [HttpPost]
        public ActionResult Index(string Name)
        {
            
                var model = _repository.GetAll(Name);
                return View(model);
            
        }

        
        public ActionResult Details(string Name, DateTime? Date)
        {
           var model = _productDateRepository.GetPrice(Name, Date);
         
            return View(model);
        }
  Unit test file
<pre>[TestClass]
    public class UnitTest1
    {

        //private ProductRepository<iproductrepository> repository;
        //private ProductRepository<iproductdaterepository> productDateRepositor;
        private IProductRepository productRepository;
        private IProductDateRepository productDateRepository;
        public ProductController productController;
        List<productmodel> list;

        [TestInitialize]
        public void setUpController()
        {
            //repository = new ProductRepository<iproductrepository>();
            //productDateRepositor = new ProductRepository<iproductdaterepository>();
            productController = new ProductController(productRepository, productDateRepository);
            list = new List<productmodel>()
            {
                 new ProductModel(){Id=1,tickersymbol = "AAP", Price = 11100 ,Date=DateTime.Parse("12/25/2018") },
                new ProductModel(){Id=2,tickersymbol = "DAL", Price = 22200,Date=DateTime.Parse("11/27/2018")},
                new ProductModel(){Id=3,tickersymbol = "GE", Price = 33300,Date=DateTime.Parse("12/26/2018")},
                new ProductModel(){Id=4,tickersymbol = "AMZN", Price = 44400,Date=DateTime.Parse("11/27/2018")},
                new ProductModel(){Id=5,tickersymbol = "FNB", Price = 55500,Date=DateTime.Parse("12/28/2018")},
            };


        }
        [TestMethod]
        public void Index()
        {
            

            //Arrange
            var controller = productController;
            //Act
            
            var result = controller.Index("AAP") as ViewResult;
            var tickerdetails = (ProductModel)result.ViewData.Model;

            //Assert
            Assert.AreEqual("AAP",tickerdetails.tickersymbol );
            
        }

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