public function testRetrievesUniqueHubServerUrlsOnly()
 {
     $this->subscriber->addHubUrls(array('http://www.example.com/hub', 'http://www.example.com/hub2', 'http://www.example.com/hub'));
     $this->assertEquals(array('http://www.example.com/hub', 'http://www.example.com/hub2'), $this->subscriber->getHubUrls());
 }