public void Can_remove_an_item()
{
var box = new Box();
var item = new Item {Name = "Test Item"};
box.AddItem(1, item);
Assert.Equal(1, box.Contents.Count(x => x.Item == item));
box.RemoveItem(item);
Assert.Empty(box.Contents);
}
public void Removing_an_item_that_is_not_in_box_throws_error()
{
var box = new Box();
Assert.Throws<InvalidOperationException>(() => box.RemoveItem(new Item()));
}