Not a loyalty test — a scheduling one. Scripted proves the behaviour you already know to check; exploratory finds what nobody specified. Here's which to reach for, when, and how to blend them in one cycle.
The three 'box' terms are interview trivia until you use them right: they describe how much of the code you can see when designing a test, which decides what you'll catch. Most functional QA is quietly grey-box — here's why.
Given/When/Then isn't automatically better than a plain test case — it buys shared language with non-testers at the cost of ceremony. Whether that pays off depends on who actually reads and co-writes your tests.
Every checkout test was green, but combining two discounts and a gift card drove the total negative — and issued credit. A case study in testing invariants, not just features.
A negative quantity on a "remove stock" action inflated inventory and caused overselling. The feature worked; the absent negative test did not. Test the negative space at the endpoint.