I don't know the answer, but this doesn't seem to tell us one way or the other. Even if there is independent lab testing for the final certification, it would

I don't know the answer, but this doesn't seem to tell us one way or the other. Even if there is independent lab testing for the final certification, it would be crazy for the company to not perform their own testing many many more times during the R&D process. I have a friend who does mass spectroscopy testing to measure volatile chemical emissions from consumer goods. They don't do final certification testing for the relevant government agency, but they are contracted by the companies themselves to provide continuous testing services as the products are being developed and manufacturing processes are being dialed in. Once they have a finished product, it's sent to a government lab (or independent contractor, I'm not sure) for final certification.