Mutagenesis\Runner\RunnerAbstract::setCacheDirectory PHP Method

    public function setCacheDirectory($dir)
    {
        $dir = rtrim($dir, ' \\/');
        if (!is_dir($dir) || !is_readable($dir)) {
            throw new \Mutagenesis\FUTException('Invalid cache directory: "' . $dir . '"');
        }
        $this->_cacheDirectory = $dir;
        return $this;
    }