Alternate node/add page
Due to talking from comments, there answer that help:

You cann't alternate node/add/nodetype via Test. 
You can create alias Test for node/add/nodetype or you can write custom function, that call node/add/nodetype form via drupal_get_form with some node preparements function. 
After this you can apply Panels and so on

First answer was incorrect:
Enable Page manager module (part of CTools), then goto admin/structure/pages and add 'Add custom page', set path to test, save it. Now you can use your Panels that fire for Test page.