If you're not current on your manned license, you'll need to talk the standard 107 test. And there is no medical involved. However, you will need to by "physically and mentally" able to fly. But it's just self regulated.
And my knowledge is from personal experience too. I hold a PPL and currently fly under BasicMed. My 3rd Class medical expired in 2014 so I flew Light Sport until BasicMed came out. I got my 107 in August 2016 without taking the $150 test, just the FAA online course. Then CFI & IACRA to submit to the FAA.
However, as it says above, you'll have to current on your BFR, which I was. So it's either become current and have some fun flying or take the $150 test every two years.