Good questions! The intention is that quality can never go below zero but there's no upper bound. The number of tests in the suite is something the players can know and roll for themselves (and writing tests can add to an existing test suite or start a new one, for example one test suite might be focused on the engines while a different test suite is for the weapons and defenses), the hidden information relates to the numbers in the use cases, not how many use cases there are. The idea is that you know how much you've tested, but you only have an educated guess about how well that corresponds to how well you've tested.