ObjectCalisthenics\AbstractPropertyTypePerClassLimitSniff::checkUntrackedClassPropertyAmount PHP Method

    private function checkUntrackedClassPropertyAmount() : string
    {
        $untrackedPropertyList = PropertyFilter::filterUntrackedClassPropertyList($this->propertyList, $this->getTrackedPropertyTypeList());
        $untrackedPropertyAmount = count($untrackedPropertyList);
        if ($untrackedPropertyAmount > $this->untrackedMaxCount) {
            $message = 'You have %d properties declared of %s type, must be less or equals than %d properties in total';
            $error = sprintf($message, $untrackedPropertyAmount, 'object instance', $this->untrackedMaxCount);
            return $error;
        }
        return '';
    }