public void IfOrderInMarket_ShouldReturnItsID()
        {
            var market = new Market();
            var orderA = new Order(120, Currency.USD, Currency.EUR, 100 / 120);
            var orderB = new Order(100, Currency.EUR, Currency.USD, 120 / 100);

            market.AddOrder(orderA);
            var matchedOrderId = market.FindMatch(orderB);

            Assert.AreEqual(matchedOrderId, 0);
        }