You won't regret having brakes on the trailer once you get through all this.
You can tell if the brakes function by putting power to them- simple enough, right?
A bigger problem for you is that you have to show the inspector they're "operational" by demonstrating so during the inspection. I don't think running a couple of wires to them during the inspection will do the trick.
It's likely that in an inspection, operational means that they must work when you apply the brakes in your tow vehicle.
For that you need a brake controller installed in the tow vehicle.
. You can buy one for under $100.00 and have it installed for another $100.00 or so.
I recommend professional installation. Any RV place and many U-haul
shops can do this job.
If I were you, I'd have a charging line for the trailer battery
put in at the same time (extra cost, of course, but worth it.)
If you do that, make sure to ask for a battery
isolator so that your trailer doesn't drain your tow vehicle battery
dry while stopped.
You might find Jane's thread on the brake controller subject instructive.
It's atRecommendation for an electric brake controller?
Hope this helps, and congrats on your success so far!