@jack__d: If you're just getting "no data" once and nothing else, the test isn't working correctly. You should get "no data" twice when it works correctly and the issue is fixed, or "unknown error" and some other info if the issue is present. I'm not sure why it doesn't work for you though.

I tried it with Python 3.9.6 now, and I'm still seeing the issue, with the same output as in my original post (apart from a newline between "no data" and "unknown error", and a different line number and id numbers).