public function createRoot(Node $node)
    {
        if($node instanceof NodeWrapper)
        {
            throw new \InvalidArgumentException('Can\'t create a root node from a NodeWrapper node');
        }

        $node->setLeftValue(1);
        $node->setRightValue(2);

        if($this->getConfiguration()->hasManyRoots())
        {
            $rootValue = $node->getId();
            if($rootValue === null)
            {
                // Set a temporary value in case wrapped node requires root value to be set
                $node->setRootValue(0);
                $this->getEntityManager()->persist($node);
                $this->getEntityManager()->flush();
                $rootValue = $node->getId();
            }

            if($rootValue === null)
            {
                // @codeCoverageIgnoreStart
                throw new \RuntimeException('Node must have an identifier available via getId()');
                // @codeCoverageIgnoreEnd
            }

            $node->setRootValue($rootValue);
        }


        $this->getEntityManager()->persist($node);
        $this->getEntityManager()->flush();

        return $this->wrapNode($node);
    }