I'm not the one claiming that Autopilot is able to make a cross-country trip but delaying the test because it would be "too easy" to prove anything. If it were actually that easy, Tesla would have done it, because Musk has never passed up the chance for that sort of publicity.

Ergo, logically, if Tesla has not performed such a test, it is strong evidence that Autopilot is not currently capable of passing it.