F/A 18 - it's the diff pressure that matters, not the actual outside pressure.
Provided they got the diff right it wouldn't matter whether they were at sea level or 50,000'.
This is why they used to do pressure tests on new airliners in a vacuum, and nowadays in computer modelling.
If they pressurised the aircraft to a typical 8000', but it remained on the ground at the 3000' high Mojave Airport, then there was never going to be enough of a pressure differential to get an explosive decompression.
If they aimed for the correct pressure differential, in order to replicate the air pressure differential for an airliner flying at, say, FL250, they would have had to pump the jet up many more times than the normal amount, someting I doubt the structure of a new aircraft, let alone a hulk with their dodgy brothers patches would have been able to take.
Make sense?