Why are you trying the benchmark NMEAtest? That doesn't even use a GPS device. See comments at the top.
Try the sketches in the order listed in the Installation instructions: NMEA and NMEAorder.
If they work, you could then try NMEAsimple, NMEAloc, NMEAtimezone, NMEAdistance... be sure to read the comment blocks at the top so you know what they are supposed to do. And what you might need to do.