You would be well served to assume that you'll be drug tested.

It's pretty common for probation officers to have the discretion to order drug testing as a standard term of probation, applicable to everybody who is on probation. It's also possible to have drug testing as a specific term of probation, for a particular offender. I can't tell you the terms of probation for your court or case. You could ask your probation officer, but of course that could inspire your probation officer to think, "Perhaps I should be testing this guy."