Feature test http responses interfere between tests

It turned out that issue was caused by redirect in controller in post action:

PHP Code:

        return $this->response->redirect(route_to('abc.view', $id)); 


I replaced it with:

PHP Code:

        return redirect()->to(route_to('abc.view', $id)); 


Now all tests pass fine.
Can anybody please explain what is the difference between them and why first one fails? Is it wrong to use it? In browser all works fine.