From personal experience with courts (and I've had my fair share... unfortunately) be expecting the worst. If you have time, go ahead and start preparing for a drug test.

But a bigger question... does your sentence require you to submit to drug testing? i still have every court paper i've gotten and for all criminal (i know you said traffic court, but im just giving my thoughts since i've never really dealt with traffic court) and it always outlines everything that you agree to under your sentence.

Go through them and see what you find. If you had community service and fines though, I wouldn't be surprised if you were in fact on probation. In my state, even traffic gets assigned probation, but its most likely unsupervised and you never report to an officer. Then your off when you pay off your fines and whatever else they make you do.