function testRetrieveNextAndPreviousFeedsFromService()
 {
     $user = constant('TESTS_ZEND_GDATA_CLIENTLOGIN_EMAIL');
     $pass = constant('TESTS_ZEND_GDATA_CLIENTLOGIN_PASSWORD');
     $this->blog = constant('TESTS_ZEND_GDATA_BLOG_ID');
     $service = 'youtube';
     $client = Zend_Gdata_ClientLogin::getHttpClient($user, $pass, $service);
     $gd = new Zend_Gdata($client);
     $feed = $gd->getFeed('http://gdata.youtube.com/feeds/api/standardfeeds/recently_featured', 'Zend_Gdata_App_Feed');
     $this->assertNotNull($feed);
     $this->assertTrue($feed instanceof Zend_Gdata_App_Feed);
     $this->assertEquals($feed->count(), 25);
     $nextFeed = $gd->getNextFeed($feed);
     $this->assertNotNull($nextFeed);
     $this->assertTrue($nextFeed instanceof Zend_Gdata_App_Feed);
     $this->assertEquals($nextFeed->count(), 25);
     $previousFeed = $gd->getPreviousFeed($nextFeed);
     $this->assertNotNull($previousFeed);
     $this->assertTrue($previousFeed instanceof Zend_Gdata_App_Feed);
     $this->assertEquals($previousFeed->count(), 25);
 }