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I've tended to use wire and bulbs to test stuff, like, connect the front/rear lamps as directly to the hub as possible and see if they light up, probably really only used a meter to check for a circuit from one end of the wiring to the other.
I'd start with that as it seems unlikely the hub is dud if it's that new. If the wiring checks out then you probably should be able to get some illumination of the lamps with some AA batteries?
M_V
So I would then test 1. voltage from the hub connector, and if that works, 2. voltage at the end of the wire to the front light, and if that works, 3. voltage at the connector from the front light to the rear light wire, and if that works, 4. voltage at the end of the wire to the rear light, and if that works, it's the rear light?
I know nothing works if the rear light is connected the wrong way around, so presumably a fault anywhere in the system means it'll all be off