org\bovigo\vfs\vfsStreamWrapper::getRoot PHP Метод

    public static function getRoot()
    {
        return self::$root;
    }

 private function createFile($filePath, $body = 'hello')
 {
     vfsStream::newFile($filePath)->at(vfsStreamWrapper::getRoot());
     $path = vfsStream::url('root/' . $filePath);
     file_put_contents($path, $body);
     return $path;
 }