Inspired by this XKCD comic (and also this one and its explanation) I was reading up on James Webb Space Telescope... I stumbled on this FAQ:
How is testing different for Hubble and Webb's mirrors? What did Hubble teach us?
First, on Webb, we used completely separate sets of measurement tools and techniques for verification than what we used to guide manufacturing. This avoids one error from the Hubble experience where the same tool used for manufacturing was later used for verification.
Ha! Sounds a lot like developers writing their own tests...
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