public function testSort()
{
$root = new RootNode();
$parent = $this->createParentNode();
$root->append($parent);
$children = [];
for ($i = 0; $i <= 21; $i++) {
$children[] = $this->createNode();
}
$parent->append($children);
$collection = new NodeCollection($children, TRUE);
foreach ($collection as $k => $child) {
$this->assertSame($children[$k], $child);
}
}
