public function testUrl()
 {
     $result = $this->Media->url('http://example.com/img/image-png');
     $this->assertNull($result);
     $result = $this->Media->url('img/special-image-&-png');
     $this->assertEqual($result, 'http://fo&o:bar@example.com/media/special%5Bfolder%5D/img/special-image-%26-png.png');
     $result = $this->Media->url('img/image-png');
     $this->assertEqual($result, '/media/static/img/image-png.png');
     $result = $this->Media->url('s/static/img/image-png');
     $this->assertEqual($result, '/media/filter/s/static/img/image-png.png');
     $result = $this->Media->url('img/image-png-x');
     $this->assertNull($result);
     $result = $this->Media->url('img/image-png-xyz');
     $this->assertNull($result);
     $result = $this->Media->url('s/transfer/img/image-png-x');
     $this->assertEqual($result, '/media/filter/s/transfer/img/image-png-x.png');
     $result = $this->Media->url($this->Data->settings['filter'] . 's/transfer/img/image-png-x.png');
     $this->assertEqual($result, '/media/filter/s/transfer/img/image-png-x.png');
 }