public static function getFile($fileName)
    {
        $filesystem = new Filesystem();
        $file       = $filesystem->normalizePath(__DIR__ . '/../' . $fileName);

        if (! file_exists($file)) {
            throw new RuntimeException(
                sprintf(
                    'Could not find a matching file for file name "%1$s".',
                    $fileName
                )
            );
        }

        return $file;
    }