public function testExtensionAttributes()
 {
     $extensionAttributes = $this->comments->extensionAttributes;
     $extensionAttributes['foo1'] = array('name' => 'foo1', 'value' => 'bar');
     $extensionAttributes['foo2'] = array('name' => 'foo2', 'value' => 'rab');
     $this->comments->extensionAttributes = $extensionAttributes;
     $this->assertEquals('bar', $this->comments->extensionAttributes['foo1']['value']);
     $this->assertEquals('rab', $this->comments->extensionAttributes['foo2']['value']);
     $commentsXml = $this->comments->saveXML();
     $newComments = new Zend_Gdata_Extension_Comments();
     $newComments->transferFromXML($commentsXml);
     $this->assertEquals('bar', $newComments->extensionAttributes['foo1']['value']);
     $this->assertEquals('rab', $newComments->extensionAttributes['foo2']['value']);
 }