[josephg]

Sure you can.

I’ve done “prac tests” before when I was studying CS. The test happened in a computer lab. We were given some specs and had to submit programs which implemented the specs. (The specs were written in a way that grading could happen automatically).

Just do the same thing, except the student is given some code with some failing tests. Their grade is determined by how many of the bugs they can fix within the time allotted.