public void When_CalculatePriceForProductWithVolumePriceWithNotEnoghtCount_Expected_PriceMultiplayOnCount()
        {
            PricingVolumeAlgorithm algorithm = new PricingVolumeAlgorithm();
            decimal result = algorithm.Calculate("B", 11, 1.00m, 1.20m, 100);

            Assert.That(result, Is.EqualTo(11.0));
        }
        public void When_CalculatePriceForProductWithSinglePrice_Expected_PriceMultiplayOnCount()
        {
            PricingVolumeAlgorithm algorithm = new PricingVolumeAlgorithm();
            decimal result = algorithm.Calculate("A", 3, 1.25m, null, null);

            Assert.That(result, Is.EqualTo(3.75m));
        }