public function testPreviousChildWithRemove()
{
$parent = new Node();
$child = new Node();
$child2 = new Node();
$child3 = new Node();
$parent->addChild($child);
$parent->addChild($child2);
$parent->addChild($child3);
$parent->removeChild($child2->id());
$this->assertEquals($child->id(), $parent->previousChild($child3->id())->id());
}
