public void PerformPreSellByUpdate_IncreasesQualityByThree_WhenSellInIsBetweenFiveAndOne(int sellIn)
        {
            var item = new Item {
                Quality = 1, SellIn = sellIn
            };
            var subject = new BackstagePassStrategy(item);

            subject.PerformPreSellByUpdate();

            Assert.That(item.Quality, Is.EqualTo(4));
        }
        public void PerformPreSellByUpdate_IncreasesQualityByOne_WhenSellInIsGreaterThanTen(int sellIn)
        {
            var item = new Item {
                Quality = 1, SellIn = sellIn
            };
            var subject = new BackstagePassStrategy(item);

            subject.PerformPreSellByUpdate();

            Assert.That(item.Quality, Is.EqualTo(2));
        }