Track::finder PHP 메소드

    public static function finder($class = __CLASS__)
    {
        return parent::finder($class);
    }

 function test_belongs_to()
 {
     $track = Track::finder()->withAlbum()->find('id = ?', 1);
     $this->assertEqual($track->id, "1");
     $this->assertEqual($track->song_name, "Track 1");
     $this->assertEqual($track->Album->title, "Album 1");
 }