Ojs\JournalBundle\Entity\ArticleAuthor::setAuthorOrder PHP Method

    public function setAuthorOrder($authorOrder)
    {
        $this->authorOrder = $authorOrder;
        return $this;
    }

 public function testDelete()
 {
     $em = $this->em;
     $author = new Author();
     $author->setFirstName('firstName delete');
     $author->setLastName('lastName delete');
     $em->persist($author);
     $em->flush();
     $article = $em->getRepository('OjsJournalBundle:Article')->find('1');
     $entity = new ArticleAuthor();
     $entity->setAuthor($author);
     $entity->setArticle($article);
     $entity->setAuthorOrder('1');
     $em->persist($entity);
     $em->flush();
     $id = $entity->getId();
     $this->logIn();
     $client = $this->client;
     $token = $this->generateToken('ojs_journal_article_author' . $id);
     $client->request('DELETE', '/journal/1/article/1/author/' . $id . '/delete', array('_token' => $token));
     $this->assertStatusCode(302, $client);
 }