public function testLastChild()
{
$parent = new Node();
$child = new Node();
$child2 = new Node();
$child3 = new Node();
$parent->addChild($child);
$parent->addChild($child2);
$parent->addChild($child3);
$this->assertEquals($child3->id(), $parent->lastChild()->id());
}
public function testGetGreatAncestor()
{
$parent = new Node();
$child = new Node();
$child2 = new Node();
$parent->addChild($child);
$child->addChild($child2);
$ancestor = $child2->getAncestor($parent->id());
$this->assertEquals($parent->id(), $ancestor->id());
}
