Not exactly fuzzing, no. Most tests are written with a fixed date, or now(). Instead, using now()+delta can help discover future bugs and give you some time to

Not exactly fuzzing, no. Most tests are written with a fixed date, or now(). Instead, using now()+delta can help discover future bugs and give you some time to remedy the issue. Often annoying to write tests like that, though, without them breaking for unrelated/timing issues compared to a fixed value.