Does anyone outside safety-critical industries (eg aerospace) actually work with proper test sets?  Perhaps it's just my (30-year) experience, but I'm yet to work anywhere which has proper test data sets (that are not yesterdays/last weeks' backup restored), and that's across insurance, pensions, oil exploration, finance,merchant banking, and logistic sectors... everywhere wants their software yesterday and is not prepared to put in the time/money/people to test it properly.