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That doesn't really have anything to do with the GPS jamming tests. That's because GPS isn't actually global, or at least wasn't a couple decades ago. What you're checking is the number of satellites available on your flight path at the time you'll be there such that you can create an accurate and redundant 3d fix.

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You’re talking about RAIM. But you’re also required to check NOTAMs, where these tests are documented, under the “all pertinent information” clause of the preflight regs.

You're required to check both, RAIM availability (unless you have a WAAS type GPS) and also the NOTAMs where these jamming tests are published.

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