public static function getIncludedFilesAsString()
 {
     $blacklist = PHPUnit_Util_Filter::getBlacklistedFiles();
     $blacklist = array_flip($blacklist['PHPUNIT']);
     $files = get_included_files();
     $result = '';
     for ($i = count($files) - 1; $i > 0; $i--) {
         if (!isset($blacklist[$files[$i]]) && is_file($files[$i])) {
             $result = 'require_once \'' . $files[$i] . "';\n" . $result;
         }
     }
     return $result;
 }