AppBundle\Entity\User::getRoles PHP Метод

    public function getRoles()
    {
        $roles = $this->roles;
        // guarantees that a user always has at least one role for security
        if (empty($roles)) {
            $roles[] = 'ROLE_USER';
        }
        return array_unique($roles);
    }

 public function testFindAllUsersByDepartmentAndRoles()
 {
     $this->users = $this->em->getRepository('AppBundle:User')->findAllUsersByDepartmentAndRoles(1, $this->em->getRepository('AppBundle:Role')->findOneByRole('ROLE_USER'));
     foreach ($this->users as $this->user) {
         $this->assertEquals(1, $this->user->getFieldOfStudy()->getDepartment()->getId());
         $this->assertContains(toArray('ROLE_USER'), $this->user->getRoles());
     }
 }