I was going to say "Stop your whining and go train" but that might not work out so well.
How about...there's a story about a guy who entered an all karate Japanese tournament with one arm tied behind his back because and Aikido guy busted it for him and he won the tournament. You could try to do the test.
Seriously..I wouldn't think about testing. There are worse things than waiting until the next grading period. Just think how good you'll be then
I do, however, understand your frustration. I had to sit in seiza and watch class for a month 5 days a week, 4 hours a day because I was dumb enough to do something bad to my shoulder and was unable to train. On the plus side, when I was able to slowly start training again my shoulder was a good bounce detector, so I could tell when my balance was off
Good Luck,
--Michael