public function testAbsoluteUrlIsRecognisedAsNonRelative()
 {
     $url = new \webignition\Url\Url('http://example.com/absolute/url');
     $this->assertFalse($url->isRelative());
 }
 /**
  * 
  * @return string
  */
 private function findSitemapUrlsFromRobotsTxt()
 {
     $robotsTxtParser = new \webignition\RobotsTxt\File\Parser();
     $robotsTxtParser->setSource($this->getRobotsTxtContent());
     $robotsTxtFile = $robotsTxtParser->getFile();
     $urls = array();
     if ($robotsTxtFile->directiveList()->containsField('sitemap')) {
         $sitemapDirectives = $robotsTxtFile->directiveList()->filter(array('field' => 'sitemap'));
         foreach ($sitemapDirectives->get() as $sitemapDirective) {
             /* @var $sitemapDirective \webignition\RobotsTxt\Directive\Directive */
             $sitemapUrl = new \webignition\Url\Url((string) $sitemapDirective->getValue());
             if ($sitemapUrl->isRelative()) {
                 $absoluteUrlDeriver = new \webignition\AbsoluteUrlDeriver\AbsoluteUrlDeriver((string) $sitemapUrl, $this->getConfiguration()->getRootUrl());
                 $urls[] = (string) $absoluteUrlDeriver->getAbsoluteUrl();
             } else {
                 $urls[] = (string) $sitemapUrl;
             }
         }
     }
     return $urls;
 }