public function testPackWithoutBox()
{
$item1 = new TestItem('Item 1', 2500, 2500, 20, 2000, true);
$item2 = new TestItem('Item 2', 25000, 2500, 20, 2000, true);
$item3 = new TestItem('Item 3', 2500, 2500, 20, 2000, true);
$packer = new Packer();
$packer->addItem($item1);
$packer->addItem($item2);
$packer->addItem($item3);
$packedBoxes = $packer->pack();
}