Google\Spreadsheet\Spreadsheet::getWorksheetFeed PHP Method

    public function getWorksheetFeed()
    {
        $res = ServiceRequestFactory::getInstance()->get($this->getWorksheetsFeedUrl());
        return new WorksheetFeed(new \SimpleXMLElement($res));
    }

 public function testGetWorksheetFeed()
 {
     $this->setServiceRequest("worksheet-feed.xml");
     $spreadsheet = new Spreadsheet($this->getSimpleXMLElement("spreadsheet"));
     $this->assertTrue($spreadsheet->getWorksheetFeed() instanceof WorksheetFeed);
 }