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);
}