public void CreateOrderValidationTest(string userId, string firstName, string lastName, string phoneNumber, string pickUpAdress, DateTime fromDate, DateTime toDate, int?carId)
        {
            //Arrange
            var mockUow = new Mock <IUnitOfWork>();

            mockUow.Setup(a => a.Orders.Create(It.IsAny <Order>()));

            //Act
            var service = new RentService(mockUow.Object);

            //Assert
            Assert.Throws <ValidationException>(
                () =>
                service.CreateOrder(new OrderDTO
            {
                UserId        = userId,
                FirstName     = firstName,
                LastName      = lastName,
                PhoneNumber   = phoneNumber,
                FromDate      = fromDate,
                ToDate        = toDate,
                PickUpAddress = pickUpAdress
            }, carId));
        }