public void CalculateChangeTestMethod2()
        {
            // в кошеле одна 10руб, три 5-ти руб и восемь 2-х руб и 1 руб
            Wallet wallet = new Wallet(new CoinPack[] { new CoinPack(10, 1), new CoinPack(5, 3), new CoinPack(2, 8), new CoinPack(1, 1) });

            var result = wallet.CalculateChange<LessCoinsAlgorithm>(11).ToArray();

            Assert.IsTrue(2 == result.Count());
            Assert.IsTrue(0 != result.Count(p => p.Nominal == 10 && p.Quantity == 1));
            Assert.IsTrue(0 != result.Count(p => p.Nominal == 1 && p.Quantity == 1));
        }