//Test
public void TestMethod1()
        {
            Mock<IUserRepository> mock = new Mock<IUserRepository>();

            mock.Setup(u => u.users).Returns(new MyUser[] {
               new MyUser{ID=1, username = "Example1", password = "Password", email="example@gmail.com"},
               new MyUser{ID=2, username = "Example2", password = "Password", email="example1@gmail.com"},
               new MyUser{ID=3, username = "Example3", password = "Password", email="example2@gmail.com"}
            });
            mock.Setup(u => u.FindByUsername("Example1")).Returns(new MyUser { ID = 1, username = "Example1", password = "Password", email = "example@gmail.com" });
            MyUser user = new MyUser { ID = 1, username = "Example1", password = "Password", email = "example@gmail.com" };
            HomeController controller = new HomeController(mock.Object);
            controller.SignIn(user);
        }

//Metod od kontroler
[HttpPost]
        public ActionResult SignIn([Bind(Include ="username, password, email")] MyUser user)
        {

            MyUser usernameUser = users.FindByUsername(user.username);
            MyUser emailUser = users.FindByEmail(user.email);
            if (usernameUser!=null) //pagja na ovaa linija testot so NullReferenceException
            {
                Session["userID"] = usernameUser.ID;
                return RedirectToAction("Profile", "User", new { id = usernameUser.ID });
            }
            else
                return RedirectToAction("Profile","User", new { id = emailUser.ID });
        }