A quiz where the teacher has set a time limit, a close date and "When time expires" to "the attempt is submitted automatically". The time limit must be long enough so that the close date can expire before the time limit.
1. As student, start a quiz attempt and answer some questions but not all, then log out of Moodle.
2. Wait until the close date has expired but before the time limit has passed. CRON has not been run yet.
3. CRON runs!
4. Log in as teacher, and you should be able to see that the attempt has been updated to finished and no longer "In-progress".
5. Log in as student, and you should see that the attempt has been submitted.