public void Can_remove_some_from_boxed_item_quantity()
{
var item = new Item();
var boxedItem = new BoxedItem(2, item);
Assert.Equal(2, boxedItem.Quantity);
boxedItem.RemoveSome(1);
Assert.Equal(1, boxedItem.Quantity);
}
public void Trying_to_remove_by_negative_number_throws_error()
{
var boxedItem = new BoxedItem(1, new Item());
Assert.Throws<InvalidOperationException>(() => boxedItem.RemoveSome(-1));
}