- All items have a SellIn value which denotes the number of days we have to sell the item
- All items have a Quality value which denotes how valuable the item is
- The Quality of an item is never negative
- The Quality of an item is never more than 50
- Once the sell by date has passed, Quality degrades twice as fast
- "Aged Brie" actually increases in Quality the older it gets
- "Sulfuras" always has a value of 80 because it is Legendary
- "Backstage passes", like aged brie, increases in Quality as its SellIn value approaches;
- Quality increases by 2 when there are 10 days or less and by 3 when there are 5 days or less but
- Quality drops to 0 after the concert
- "Conjured" items degrade in Quality twice as fast as normal items
- At the end of each day our system lowers both values for every item
- Make changes to the UpdateQuality method
- Make the UpdateQuality method and Items property static
- Do not alter the Item class or Items property