Ergo\Http\Url::getUrlForRelativePath PHP Method

    public function getUrlForRelativePath($path)
    {
        return $this->getUrlForPath($this->_joinPathComponents($this->getPath(), ltrim($path, '/')));
    }

 public function testGetForRelativePathWithOnlySlash()
 {
     $url = new Http\Url('http://example.org/test');
     $relative = $url->getUrlForRelativePath('/');
     $this->assertEquals($relative->__toString(), 'http://example.org/test');
 }