It has admittedly been a long time since I went to law school, but in my experience there was only one test per course -- the final exam. No other evaluation whatsoever.
It is over 30 years since I graduated law school, but except for a couple of courses, that was how it was when I was in law school. Exceptions: research course in 1st year (pass/fail), course where we represented mental patients in civil commitment hearings, and third year seminar which was a written project (one grade, just not an exam).
To the OP - I find this topic really interested. I'm not a scientist, but I enjoy learning new things. I do a lot of reading on stuff just for fun to learn things. I find though that I personally don't like non-credit courses. I feel that if I'm going to do the work I like having credit for it. I actually like working for a grade and doing tests/assignments.
I actually like being a student. The CC has some courses for seniors, but they are mostly short, not in depth, and have no grades, and give no credit. That doesn't appeal to me.
I've actually thought about taking some for credit courses from the CC, just for fun but getting credit. I've even considered taking some courses at the state university about an hour from our house. But, that is kind of pricy and I have nothing that I really want to study.
I did spend several years about 20 years ago where I did some post-baccalaureate psychology courses and that was interesting enough to me that I actually went to school part-time and earned an MSW degree although I never worked in that field.
I don't really want to have a job, but just learning for the sake of learning is interesting.