response_status_is  [ GET => '/javascripts/test.js' ], 200,
    'response status is 200 for /js/test.js';
response_content_is [ GET => '/javascripts/test.js' ], 'var test = 1;', 'Fetched JS';
response_headers_include [ GET => '/javascripts/test.js' ],
    [ 'Content-Type' => 'text/javascript' ], "MIME type set for JS";