You have a point. It's probably not unreasonable to test every Unicode codepoint against a low-level shared library, at least for APIs that process a single cod

You have a point. It's probably not unreasonable to test every Unicode codepoint against a low-level shared library, at least for APIs that process a single codepoint. I don't think it's a no-brainer though. And it is unreasonable to expect a testing technique to be applied in every case where it is reasonable to do so. There are a lot of techniques that are reasonable to use in any give case but it would be no sense at all to apply every one of them. To focus on this one, now, amounts to Monday morning quarterbacking. Once you know the bug it's easy to see how it could have been caught. Of course if you somehow knew of a bug ahead of time you wouldn't need any test at all!