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Mar 15, 2019 at 21:51 comment added gnasher729 “Airplane doesn’t spontaneously turn round to fly on its back” was most likely not written down as a requirement. The perverted argument seems to be that since this shouldn’t happen anyway, white box testing with the knowledge that some places might be special is “waste”. I’d check what happens when a plane crosses the equator or flies over the poles, or crosses the 0 meridian or the date line.
Mar 15, 2019 at 11:26 comment added ttulka Safety sounds to me like a good value for the customer :-)
Mar 15, 2019 at 11:13 history answered gnasher729 CC BY-SA 4.0