Add more tests for relative path

Author: SenseException

src/Url.php

@@ -100,7 +100,7 @@ private static function split($url)
         } else {
             // No path, only host
             $host = $url;
-            $url = '';
+            $url = '/';
         }
 
         // At this point, we have $scheme, $host and $path

tests/UrlTest.php

@@ -165,6 +165,15 @@ public function provideMakeRelativeIsAlreadyRelativeTests()
             array('css/style.css', '', 'css/style.css'),
             array('css/../style.css', '', 'style.css'),
             array('css/./style.css', '', 'css/style.css'),
+            array('../style.css', '/', 'style.css'),
+            array('./style.css', '/', 'style.css'),
+            array('../../style.css', '/', 'style.css'),
+            array('../../style.css', '', 'style.css'),
+            array('./style.css', '', 'style.css'),
+            array('../style.css', '', 'style.css'),
+            array('./../style.css', '', 'style.css'),
+            array('css/./../style.css', '', 'style.css'),
+            array('css//style.css', '', 'css/style.css'),
         );
     }
 }