Testing huh...
Well all you really need to do is download a good toolbox such as BackTrack. I still use BackTrack3, but 4 is good too. You can get it here:
http://www.remote-exploit.org/backtrack_download.html
After you have downloaded it, you can either install it on a Linux box, or create a VM on your Windows box to install it on, or just burn a live CD, and you are all set.
Next you can find some good tutorials on YouTube that will show some good demos of using aircrack. Pretty simple... Really you should just drop using WEP all together and config your setup for WPA2. It is more secure, not uncrackable, but more likely to deter someone from trying to cracking your wireless network.. Have fun!