public void AgeBrie()
{
var item = new Item {
Name = GildedRose.AgedBrie, SellIn = 1, Quality = 47
};
var app = new GildedRose(null);
// check increases by 1 when before sell in
app.AgeBrie(item);
Assert.AreEqual(48, item.Quality);
Assert.AreEqual(0, item.SellIn);
// check increases by 2 when after sell in
app.AgeBrie(item);
Assert.AreEqual(50, item.Quality);
Assert.AreEqual(-1, item.SellIn);
}
