NodeTest::testNumChildren PHP Method

    public function testNumChildren()
    {
        // start with root node only
        $parent = NodeFactory::getInstance();
        $this->assertEquals($parent->numChildren(), 0);
        // add a child
        $child = NodeFactory::getInstance();
        $parent->addChild($child);
        $this->assertEquals($parent->numChildren(), 1);
        // add a direct grandchild, this one doesn't count as
        // it's not enclosed in a CONTAINER
        $child->addChild(NodeFactory::getInstance());
        $this->assertEquals($parent->numChildren(), 1);
        // add a container, this one doesn't count wither
        $container = NodeFactory::getInstance('Node', 'default', Node::CONTAINER);
        $parent->addChild($container);
        $this->assertEquals($parent->numChildren(), 1);
        // add a grandchild to container, this one counts
        $container->addChild(NodeFactory::getInstance());
        $this->assertEquals($parent->numChildren(), 2);
        // add another grandchild to container, this one counts
        $container->addChild(NodeFactory::getInstance());
        $this->assertEquals($parent->numChildren(), 3);
    }