aaaaerfwfwe

        public void Test_SetStockPrice_NewPrice()
        {
            string stockName = "IBM";
            decimal oldPrice = 10m;
            _stockExchange.ListStock(stockName, 1000000, oldPrice, new DateTime(2012, 1, 10, 15, 22, 00));
            decimal newPrice = 20m;
            _stockExchange.SetStockPrice(stockName, new DateTime(2012, 1, 10, 15, 40, 00), newPrice);

            Assert.AreEqual(newPrice, _stockExchange.GetStockPrice(stockName, new DateTime(2012, 1, 10, 15, 50, 0, 0)));
        }