public void ReduceStockWillReduceListOfCurrentStockByOne()
{
var expectedStock = new List <StockItem> {
new StockItem(VendingStock.Candy, 6), new StockItem(VendingStock.Chips, 0), new StockItem(VendingStock.Pop, 0)
};
_stockRepo.AddInventory(VendingStock.Candy, 7);
var actual = _stockRepo.ReduceStock(VendingStock.Candy, 1);
CollectionAssert.AreEquivalent(expectedStock, actual);
}
public int PurchaseItem(VendingStock stock)
{
var stockItems = _vendingStockRepository.ReduceStock(stock, ReduceStock);
var stockItem = stockItems.Single(x => x.Item == stock);
return(stockItem.AvailableStock);
}