function testCompare()
{
$box1 = new TestItem('Small', 20, 20, 2, 100, true);
$box2 = new TestItem('Large', 200, 200, 20, 1000, true);
$box3 = new TestItem('Medium', 100, 100, 10, 500, true);
$list = new ItemList();
$list->insert($box1);
$list->insert($box2);
$list->insert($box3);
$sorted = [];
while (!$list->isEmpty()) {
$sorted[] = $list->extract();
}
self::assertEquals(array($box2, $box3, $box1), $sorted);
}
