/**
  * helper method to assert presence and content of binford headers
  *
  * @param  stubbles\peer\HeaderList  $headerList
  */
 protected function assertBinford(HeaderList $headerList)
 {
     assertTrue($headerList->containsKey('Binford'));
     assertTrue($headerList->containsKey('X-Power'));
     assert($headerList, isOfSize(2));
     assert($headerList->get('Binford'), equals('6100'));
     assert($headerList->get('X-Power'), equals('More power!'));
 }