public function testGetSize()
{
$root = new Node();
$root->addChild($child1 = new Node('child1'))->addChild($child2 = new Node('child2'))->addChild($child3 = new Node('child3'));
$child3->addChild(new Node("a"))->addChild($child4 = new Node("b"));
$child4->addChild($child5 = new Node("c"));
$child5->addChild(new Node("d"))->addChild(new Node("f"));
$this->assertEquals(9, $root->getSize());
$this->assertEquals(3, $child5->getSize());
$this->assertEquals(4, $child4->getSize());
$this->assertEquals(6, $child3->getSize());
$this->assertEquals(1, $child2->getSize());
}
