Hi,
As far as we are aware (anyone with more knowledge please feel free to correct me), we develop the product, do internal testing, then send it to ED for testing/quality assurance, then if that passes, it gets made available in the next public update.
With that in mind, it makes our internal testing "final" (we have been testing at every stage of development, so a system will be written, then I will test it, then if I'm happy it is working as I think it should, it gets sent to our internal test team for further scrutiny, bugs/problems are logged, fixed and the cycle repeats). We are now testing the product again, essentially, to catch any last items before sending it on to ED.
Best regards,
Tango.