public function _afterSuite() {

    if (isset($this->users)) {
      $users = User::loadMultiple($this->users);
      /** @var \Drupal\user\Entity\User $user */
      foreach ($users as $user) {
        $user->delete();
      }
    }

    if ($this->config['check_logs']) {
      if (\Drupal::moduleHandler()->moduleExists('dblog')) {
        // @todo Make log levels configurable
        // Load any database log entries of level WARNING or more serious.
        $query = \Drupal::database()->select('watchdog', 'w');
        $query->fields('w', ['type', 'severity', 'message', 'variables'])
          ->condition('severity', RfcLogLevel::NOTICE, '<=')
          ->condition('type', 'php');
        $result = $query->execute();
        foreach ($result as $row) {
          // Build a readable message and declare a failure.
          $variables = @unserialize($row->variables);
          $message = $row->type . ' - ';
          $message .= RfcLogLevel::getLevels()[$row->severity] . ': ';
          $message .= t(Xss::filterAdmin($row->message), $variables)->render();
          $this->fail($message);
        }
      }
    }
  }