I guess it depends. Supposedly, if you can prove how you tested, you can be certified. I personally don't think it's worth the time to do it ourselves. Even with that negative thought on my part and even if we can't certify by doing it ourselves, it would be good and less expensive for us to be able to test to find things and fix them rather than the 3rd party finding them and us getting caught in the small but expensive loop of they find it, we fix it, they test again, oops, we didn't really fix it, we fix it again, wash, rinse, repeat.

It would be much less expensive if we found, we fixed it, and there was nothing for them to find.