//Arrange
            var _userRepository = new Mock<IUserRepository>();
            var _userStore = new Mock<IUserStore<ApplicationUser>>();
            var userManager = new UserManager<ApplicationUser>(_userStore.Object);
            var applicationUserManager = new ApplicationUserManager(_userStore.Object);
            var _countersIdRepository = new Mock<ICountersIdRepository>();
            var _userService = new Mock<IUserService>();

            RegisterBindingModel registerModel = new RegisterBindingModel() { Email = "test@gmail.com", Password = "qweasd" };
            ApplicationUser appUser = new ApplicationUser() { FirstName = "TestName", LastName = "TestLastName" };
            UserService userService = new UserService(_userRepository.Object, _countersIdRepository.Object);

            _userStore.Setup(x => x.CreateAsync(appUser)).Returns(Task.FromResult(IdentityResult.Success));
            _countersIdRepository.Setup(x => x.GetUserLastId()).Returns(10);
            _userService.Setup(x => x.Register(registerModel)).Returns(Task.FromResult(IdentityResult.Success));

            userService.UserManager = applicationUserManager;