Check for URL's absence will always pass due to wrong var name

Currently :

  $edit_links = $this->xpath('//a[@href=:href]', array(
      ':href' => url('admin/structure/contact/manage/personal')
    ));
    $this->assertTrue(empty($links), format_string('No link containing href %href found.',
      array('%href' => 'admin/structure/contact/manage/personal')
    ));

$links is never defined, so will always be empty.