Testing your webcam is done with mplayer, first though you’ll have to install mplayer as so:
sudo aptitude install mplayer
then fire up mplayer as so but in one line:
mplayer tv:// -tv driver=v4l2:width=320:height=240:fps=200:device=/dev/video0 -nosound
And you SHOULD see your pretty face on the screen. Good Luck.