public void GetAllItemTypes_ReturnsAllTypesOfItem()
{
_inv.TotalSlots = 4;
var itemA = Substitute.For <IItemInfo>();
itemA.ID = 1;
itemA.SlotsRequired = 1;
itemA.StackSize = 5;
var itemB = Substitute.For <IItemInfo>();
itemB.ID = 2;
itemB.SlotsRequired = 2;
itemB.StackSize = 1;
_inv.Store(itemA, 2);
_inv.Store(itemA, 3);
_inv.Store(itemB, 1);
_inv.Store(itemB, 1);
var types = _inv.GetAllItemTypes();
Assert.AreEqual(2, types.Count);
Assert.IsTrue(types.Contains(itemA));
Assert.IsTrue(types.Contains(itemB));
}