So, this means refactoring becomes potentially difficult. While the gem is still a great accomplishment and very useful, I'd have to engineer my way around this

So, this means refactoring becomes potentially difficult. While the gem is still a great accomplishment and very useful, I'd have to engineer my way around this issue before using it with things like a Rails Model which could have changing shape. @OP: I wonder if the README (and possibly runner) should suggest writing a test-case that doesn't rely on PBT when the user wants to preserve a case for future testing. The issue here is that if you're saving a singular example and it represents a weird corner case, it's totally conceivable that a small change will result in an invisible change to that test case. Another idea: it'd be great if the test could simply take examples that are failing and add them to a `failing_examples.rb` or some such. I know I'd use a feature like this quite a bit.