TL;DR
In this post I will explain how I tested alternative business flow in my neighborhood store. No computers, no automation, just human interaction.
Few months ago, my local store put a big sign with a business flow:
“If you find that item price do not match, or it item does not have a price tag, we will charge you only half the price.”
For one of my items I do not remember the exact price, but my heuristic is that this item should never cost more than 6 $. And this time price on the register was more than that amount.
So I reported my issue, and pointed to the big sign on the wall (consistency heuristic with claims). They confirmed me, but immediately started with excuses, why the price did not matched. I did not hesitate, show me my money!
So they put me aside, because that alternative flow required some processing of my invoice through their system. Lady at the cash register did not know how to do that, so they asked for the manager. In the end I got my money back.
Conclusion
When you find an issue in product that you are testing, always report that issue. They will use against you various psychology tricks to persuade you that this is not an issue.