I'm not sure where they test them at, but It had to have been an F-22. The FB-23 is still in the concept phase and nowhere near flying yet. I know
that Tyndall in Florida, Edwards in California, Nellis in Nevada, and Langley in Virginia have Raptors currently.
The best place to see them is actually in Marietta, Georgia. They are built there, and the first few flights of each new aircraft occurs there. They
fly the Raptors several times a week. The highway runs right by the factory, so they are easy to spot.