As others have said both lights operate on dipped beam on this and many bikes so the tester doesn't know what they are talking about. I would ask to speak with their supervisor and explain that there has never been an issue previously with the throw of the lights and explain that whilst you are happy to adjust the beams you want to make sure that the tester is not mistaken about this as well, so you don't end up having to adjust them back again for next years test.
If you end up having to adjust them, both lights are adjusted independently so you need to be sure which one needs adjusting (if not both). There are 2 adjusters, top inner corner for horizontal adjustment and bottom outer corner for vertical adjustment. For the left hand beam, turning the top inner adjuster anti-clockwise moves the beam to the right and clockwise moves it to the left. For the right hand beam turning the top inner adjuster clockwise moves the beam to the right and anti-clockwise to the left.
If you end up having to adjust them, both lights are adjusted independently so you need to be sure which one needs adjusting (if not both). There are 2 adjusters, top inner corner for horizontal adjustment and bottom outer corner for vertical adjustment. For the left hand beam, turning the top inner adjuster anti-clockwise moves the beam to the right and clockwise moves it to the left. For the right hand beam turning the top inner adjuster clockwise moves the beam to the right and anti-clockwise to the left.