Inheritance: extends eZ\Publish\API\Repository\Values\User\RoleCreateStruct
 /**
  * Creates a role for user registration test.
  *
  * It always has the minimal set of policies to operate (user/login and content/read).
  *
  * @param bool $withUserRegisterPolicy Determines if the role gets the user/register policy
  *
  * @return Role
  */
 private function createRegistrationRole($withUserRegisterPolicy = true)
 {
     $roleIdentifier = uniqid('anonymous_role_' . ($withUserRegisterPolicy ? 'with' : 'without') . '_register');
     $roleService = $this->getRepository()->getRoleService();
     $roleCreateStruct = new RoleCreateStruct(['identifier' => $roleIdentifier]);
     $roleCreateStruct->addPolicy($roleService->newPolicyCreateStruct('user', 'login'));
     $roleCreateStruct->addPolicy($roleService->newPolicyCreateStruct('content', 'read'));
     if ($withUserRegisterPolicy === true) {
         $roleCreateStruct->addPolicy($roleService->newPolicyCreateStruct('user', 'register'));
     }
     $roleService->publishRoleDraft($roleService->createRole($roleCreateStruct));
     return $roleService->loadRoleByIdentifier($roleIdentifier);
 }