public void GetItem_GivenValidItemName_ReturnsItem()
{
testShelf.AddNewItem(twixBar, 10);
testShelf.AddNewItem(snickers, 20);
int previousItemCount = testShelf.items[twixBar.name].Count;
IProduct results = testShelf.GetItem(twixBar.name);
int currentItemCount = testShelf.items[twixBar.name].Count;
Assert.That(results, Is.EqualTo(twixBar));
Assert.That(previousItemCount, Is.GreaterThan(currentItemCount));
}
