Can you show an example of a test where you need this? I never needed anything like it, instead it would be really benefitial for my tests if Request would not be a service (and Response as well for that matter).

Also I certainly wouldn't like this method in the IRequest interface.

@JanTvrdik I like the idea, doing this every time is tedious.

instead it would be really benefitial for my tests if Request would not be a service

Feel free to join the relevant discussion.

Can you show an example of a test where you need this?

Sorry, I have a really bad memory. I found the code I have written (6 days ago) and the withUrl method would not help in that case. The reason why I brought it up today is because I was creating a draft for a router where the method would be helpful.

class DevRouter implements Application\IRouter
{
 // *.signaly.cz -> *.signaly.l 
 // *.signaly.cz -> localhost/signaly/www/*
 public function __construct($fromMask, $toMask, Application\IRouter $innerRouter)
 {
 $this->fromMask = $fromMask;
 $this->toMask = $toMask;
 $this->innerRouter = $innerRouter;
 }
 public function match(Nette\Http\IRequest $httpRequest)
 {
 $fixedUrl = $this->transformIn($httpRequest->url);
 $fixedHttpRequest = $httpRequest->withUrl($fixedUrl); // <-- THIS IS THE LINE
 return $this->innerRouter->match($fixedHttpRequest);
 }
 public function constructUrl(Request $appRequest, Nette\Http\Url $refUrl)
 {
 $url = $this->innerRouter->constructUrl($appRequest, $refUrl);
 $fixedUrl = $this->transformOut($url);
 return $fixedUrl;
 }
}

In my opinion you should just write a static helper method cloneRequestWithUrl($request, $url) outside of this class.