public void AddPromotionHandler_price_invalid()
        {
            var repository = new FakeProductRepository();
            var handler    = new ProductHandler(repository);

            var command = new ProductPromotionCommand();

            command.Id    = repository.GetAll().FirstOrDefault().Id;
            command.Price = 11.5m;

            var result = handler.AddPromotion(command);

            Assert.IsFalse(result.Success, result.Message);
        }