function testCompare()
{
$box1 = new TestBox('Small', 21, 21, 3, 1, 20, 20, 2, 100);
$box2 = new TestBox('Large', 201, 201, 21, 1, 200, 200, 20, 1000);
$box3 = new TestBox('Medium', 101, 101, 11, 5, 100, 100, 10, 500);
$list = new BoxList();
$list->insert($box1);
$list->insert($box2);
$list->insert($box3);
$sorted = [];
while (!$list->isEmpty()) {
$sorted[] = $list->extract();
}
self::assertEquals(array($box1, $box3, $box2), $sorted);
}
