public function selectStream()
{
$root = vfsStream::setup();
$file = vfsStream::newFile('foo.txt')->at($root)->withContent('testContent');
$fp = fopen(vfsStream::url('root/foo.txt'), 'rb');
$readarray = array($fp);
$writearray = array();
$exceptarray = array();
stream_select($readarray, $writearray, $exceptarray, 1);
}