public function testUserAnnotationFeed()
 {
     $feed = $this->gdata->getUserAnnotationFeed();
     $this->assertTrue($feed instanceof Books\VolumeFeed);
     foreach ($feed->entries as $entry) {
         $this->assertTrue($entry instanceof Books\VolumeEntry);
         $this->assertEquals($feed->getService(), $entry->getService());
     }
     $entry = new Books\VolumeEntry();
     $entry->setId(new Extension\Id('Mfer_MFwQrkC'));
     $entry->setRating(new \Zend\GData\Extension\Rating(3, 1, 5, 1));
     $newEntry = $this->gdata->insertVolume($entry, Books::MY_ANNOTATION_FEED_URI);
     $this->assertTrue($newEntry instanceof Books\VolumeEntry);
     $this->gdata->deleteVolume($newEntry);
 }