protected function validField($field , $value , $config) {
        foreach ($config as $validator) {
            $class  = $validator['class'];
            $option = $validator['options'];
            /* @var $test ValidatorInterface */
            $test = new $class($option);
            if(!$this->executeTest($value , $test)) {
                $this->isValid = false;
                $this->addError($field, $test->getMessage());
            }
        }
    }