If you are testing your app and use urlManager in your config, sometimes you will find a problem: you want to test your site independing from urlManager settings. in that way you need to extend your WebTestCase class by this method:

public function createUrl($route,$params=array()) {
 
$url = explode('phpunit',Yii::app()->createUrl($route,$params));
return $url[1];
}

and in your tests you can use next 'open' constructions:

$this->open($this->createUrl('user/view',array('id'=>$user->id)));