public function testExtensionAttributes() {
$extensionAttributes = $this->who->extensionAttributes;
$extensionAttributes['foo1'] = array('name'=>'foo1', 'value'=>'bar');
$extensionAttributes['foo2'] = array('name'=>'foo2', 'value'=>'rab');
$this->who->extensionAttributes = $extensionAttributes;
$this->assertEquals('bar', $this->who->extensionAttributes['foo1']['value']);
$this->assertEquals('rab', $this->who->extensionAttributes['foo2']['value']);
$whoXml = $this->who->saveXML();
$newWho = new Zend_Gdata_Extension_Who();
$newWho->transferFromXML($whoXml);
$this->assertEquals('bar', $newWho->extensionAttributes['foo1']['value']);
$this->assertEquals('rab', $newWho->extensionAttributes['foo2']['value']);
}