Well there is a test server online..
Download here: http://www.megaupload.com/?d=Y4OJAO3S
If you downloaded, extract it and then click on Launch 7.3 ATTENTION: YOU ONLY CAN PLAY WITH HAMACHI ON!
When your client is starting click on : server selection (at the right top of client)
and select General Nation. Not the 0 or not 'do not use this one" And next make an acc, and play!