/// <summary>
        /// 蘋果買2顆 , 香蕉一串 ,芭樂3顆 共多少錢
        /// </summary>
        /// <returns></returns>
        public decimal CulcFruitsPrice(Dictionary <string, int> buyFruits)
        {
            var fruits = _prdouctRepository.SelectFruits();

            var totalPrice = 0m;


            foreach (var KeyValue in buyFruits)
            {
                var fruit = fruits.FirstOrDefault(p => p.Name == KeyValue.Key);
                if (fruit != null)
                {
                    totalPrice += fruit.Price * KeyValue.Value;
                }
            }


            //foreach (var fruit in fruits)
            //{
            //    if (fruit.Name == "蘋果")
            //        totalPrice += fruit.Price * 2;
            //    else if (fruit.Name == "香蕉")
            //        totalPrice += fruit.Price * 1;
            //    else if (fruit.Name == "芭樂")
            //        totalPrice += fruit.Price * 3;

            //}


            return(totalPrice);
        }
        public void CulcFruitsPriceTest_Return135()
        {
            var service2 = new ProductService(_mock);

            _mock.SelectFruits().Returns(p => new List <Product> {
                new Product {
                    Name = "蘋果", Price = 30
                },
                new Product {
                    Name = "香蕉", Price = 15
                },
                new Product {
                    Name = "芭樂", Price = 20
                },
            });

            var service = new ProductService(new ProductRepositoryStub());
            var expect  = 130;

            var result = service2.CulcFruitsPrice(GetFruit());

            Assert.AreEqual(expect, result);
        }