Bolt\Twig\TwigExtension::selectField PHP Method

    public function selectField($content, $fieldname, $startempty = false, $keyname = 'id')
    {
        return $this->handlers['record']->selectField($content, $fieldname, $startempty, $keyname);
    }

 public function testSelectField()
 {
     $app = $this->getApp();
     $handlers = $this->getTwigHandlers($app);
     $handlers['record'] = $this->getMockHandler('RecordHandler', 'selectField');
     $twig = new TwigExtension($app, $handlers, true);
     $twig->selectField(null, null, null, null);
 }