src/StreamWrapper.php
public function stream_open($path, $mode, $options, &$opened_path)
    {
        if (!isset(self::$uris[$path])) {
            return false;
        }

        $this->stream = self::$uris[$path];
        $this->mode = $mode;

        $this->stream->rewind();

        return true;
    }
public function stream_open($path, $mode, $options, &$opened_path)
    {
        if (!isset(self::$uris[$path])) {
            return false;
        }

        $this->stream = self::$uris[$path];
        $this->mode = $mode;

        $this->stream->rewind();

        return true;
    }
Open pre-mocked StreamInterface by it's unique uri.

@param string  $path
@param int     $mode
@param int     $options
@param string &$opened_path
@return bool