Ojs\JournalBundle\Entity\IssueFile::setLangCode PHP Method

    public function setLangCode($langCode)
    {
        $this->langCode = $langCode;
        return $this;
    }

 public function testDelete()
 {
     $em = $this->em;
     $entity = new IssueFile();
     $entity->setCurrentLocale('en');
     $entity->setTitle('Demo File');
     $entity->setDescription('A file');
     $entity->setFile('issue.txt');
     $entity->setLangCode('en');
     $entity->setType(0);
     $entity->setVersion(0);
     $issue = $em->getRepository('OjsJournalBundle:Issue')->find('1');
     $entity->setIssue($issue);
     $em->persist($entity);
     $em->flush();
     $id = $entity->getId();
     $this->logIn();
     $client = $this->client;
     $token = $this->generateToken('ojs_journal_issue_file' . $id);
     $client->request('DELETE', '/journal/1/issue/1/file/' . $id . '/delete', array('_token' => $token));
     $this->assertStatusCode(302, $client);
 }