public function testAddChild()
{
$c1 = new MenuNode();
$c2 = new MenuNode();
$m = new MenuNode();
$m->addChild($c1);
$ret = $m->addChild($c2);
$children = $m->getChildren();
$this->assertCount(2, $children);
$this->assertSame($m, $children[0]->getParentDocument());
$this->assertSame($c2, $ret);
}
