public void SellInMoreThan10Day_QualityIncreases_ByOne()
        {
            var input = new Item(string.Empty, 15, 2);

            var target = new BackstagePassesDayUpdater();

            var result = target.Add(input);

            Assert.Equal(input.Quality + 1, result.Quality);
        }
        public void SellIn5OrLessDays_QualityIncreases_By3()
        {
            var input = new Item(string.Empty, 5, 2);

            var target = new BackstagePassesDayUpdater();

            var result = target.Add(input);

            Assert.Equal(input.Quality + 3, result.Quality);
        }