These tests are also really really hard to do automatically. The usual way here during education is to get a worksheet parallelly to the lecture every week, wo

These tests are also really really hard to do automatically. The usual way here during education is to get a worksheet parallelly to the lecture every week, work through the problems and hand them in for correction and grading. If it's easy, the solution and correction are straight-forward. But if it's hard, as, say, some mathematical proof, sometimes a lot of knowledge and work goes into determining the correctness of the solution. And these are the problems that I feel changed the structure of my mind over the years. And then, even if things are easy to determine right or wrong, as for a coding assignment, people still profit immensely from getting good feedback on their work, from qualified people (and not peer-grading like online courses occasionally do).