Originally Posted by
Neo380
Inputting the wrong data - often as little as a missed full stop - is not an 'edge case', actually it's normal human behaviour. This has nothing to do with fail overs that don't work.
If I understand it correctly, the data provided to NATS has been pre-processed and so any errors (mistakes) should have been caught by the system doing the pre-processing. If my understanding is correct, I would expect that the assumption is that the data is now ONLY valid data, so this failure case isn't as straight forward as you may believe.
I work in the world of complex software, testing is a nightmare. As others have asked, at what point do you stop? How many bugs do you release (bearing in mind you may not know about them)? These are questions we're constantly asking and we never ever get to a stage where we satisfy everyone.