How to test code built to save/restore Lifecycle of an Activity?

Question

How can I test all of the following methods code? I want to play scenarios when all of them are happening to see if my code works for save/restore process of an activity. So

Answer 1

We had an issue whereby re-launching an app after long periods of inactivity crashed. We found that "Don't keep activities" wasn't reproducing the issue, but Background process settings :: No background processes in Dev Settings did (even while debugging).