* @param link
* @return Url
*/
public Url urlFor(final AjaxLink<?> link)
{
AbstractAjaxBehavior behavior = WicketTesterHelper.findAjaxEventBehavior(link, "onclick");
Url url = Url.parse(behavior.getCallbackUrl().toString(),
Charset.forName(request.getCharacterEncoding()));
return transform(url);
}