internal async Task ValidateBasket(ShoppingBasketDto basket)
{
if (basket == null || basket.Articles == null || !basket.Articles.Any())
{
throw new InvalidBasketException("Basket is empty");
}
foreach (var item in basket.Articles)
{
var articleDto = item.Article;
var articleDiscountDto = item.ArticleDiscount;
var articlePriceDto = item.ArticlePrice;
var numberOfArticlesDto = item.NumberOfArticles;
// check number of articles
if (!numberOfArticlesDto.HasValue)
{
throw new InvalidBasketException("Number of articles is invalid");
}
// check discount
if (articleDiscountDto != null)
{
ArticleDiscount articleDiscount = await _discountRepository.GetByIdAsync(articleDiscountDto.Id.Value).ConfigureAwait(false);
var articleDiscountDbDto = _mapper.Map <ArticleDiscountDto>(articleDiscount);
if (!articleDiscountDbDto.Equals(articleDiscountDto))
{
throw new InvalidDiscountException("ArticleDiscount is invalid");
}
}
// check article
Article article = await _articleRepository.GetByIdAsync(articleDto.Id.Value).ConfigureAwait(false);
var articleDbDto = _mapper.Map <ArticleDto>(article);
if (!articleDbDto.Equals(articleDto))
{
throw new InvalidArticleException("Article is invalid");
}
// check articlePrice
var articlePrice = await _priceRepository.GetByIdAsync(articlePriceDto.Id.Value).ConfigureAwait(false);
var articlePriceDbDto = _mapper.Map <ArticlePriceDto>(articlePrice);
if (!articlePriceDbDto.Equals(articlePriceDto))
{
throw new InvalidArticlePriceException("ArticlePrice is invalid");
}
}
}
public void CalculatePrice_TestCases_Success(int numberOfArticels, decimal articlePrice, int amountOfArticlesForDiscount, decimal discountPrice, decimal expectedPrice)
{
// Arrange
var supermarketCheckout = new SupermarketCheckoutService(_subDiscountRepository, _subPriceRepository, _subArticleRepository, _mapper);
var itemDiscount = new ArticleDiscount
{
NumberOfArticles = amountOfArticlesForDiscount,
NewPrice = discountPrice
};
// Act
decimal price = supermarketCheckout.CalculatePrice(numberOfArticels, articlePrice, itemDiscount);
// Assert
Assert.That(price, Is.EqualTo(expectedPrice));
}
internal decimal CalculatePrice(int numberOfArticles, decimal itemPrice, ArticleDiscount articleDiscount)
{
decimal price = 0;
int currentNumberOfArticles = numberOfArticles;
// 1st try to use the discount price for as much items as possible
while (articleDiscount != null && articleDiscount.NumberOfArticles != 0 && currentNumberOfArticles >= articleDiscount.NumberOfArticles)
{
price += articleDiscount.NewPrice;
currentNumberOfArticles -= articleDiscount.NumberOfArticles;
}
// 2nd use the common single item price
if (currentNumberOfArticles > 0)
{
price += currentNumberOfArticles * itemPrice;
}
return(price);
}
