Codeception\Specify::specifyGetClassPrivateProperties PHP Method

    private function specifyGetClassPrivateProperties()
    {
        static $properties = [];
        if (!isset($properties[__CLASS__])) {
            $reflection = new \ReflectionClass(__CLASS__);
            $properties[__CLASS__] = get_class($this) !== __CLASS__ ? $reflection->getProperties(\ReflectionProperty::IS_PRIVATE) : [];
        }
        return $properties[__CLASS__];
    }