public function testUnknownFeed()
 {
     $input = json_decode('{
         "Foo": [
           "search",
           [ "foo" ]
         ],
         "Bar": [
           "search",
           [
             "bar",
             "baz"
           ]
         ]
       }', true);
     $response = new AfsAcpResponseHelper($input);
     $this->assertTrue($response->has_replyset());
     try {
         $response->get_replyset('BAZ');
         $this->fail('Retrieving replyset from unknown feed should have raised exception!');
     } catch (OutOfBoundsException $e) {
     }
 }