AVR-Chat

I've been developing an embedded device for some time now, and have
decided to manufacture a batch for sale to the public.  Although I
have tested it as thoroughly as I possibly can, I would like to do
more before offering it for sale (an ounce of debugging is worth a
pound of bug fixing...).

Is there a standard testing procedure that should be used to test for
electrical and/or mechanical robustness (similar to testing for IP67
etc...)?

Obviously software testing is left up to me, which is fine; been
running 10,000 hrs non-stop on the prototypes so far.

-Don