I assume that you want to test the point switching action and the operation of the lantern as well.
The easiest way if you have several to test is to hook up a track feeder section to a transformer. It doesn't matter about the red wire so long as the brown ground wire is connected.
Then just connect each point in turn to this feeder track section. Plug the yellow into the lighting socket on the transformer and the lantern should glow. Grounding either of the blue wires by touching them to one of the rails should switch the point one way or the other depending on which blue wire you touch to the rail.

You don't actually need a feeder track - a wire plugged into the ground connection on the transformer with a crocodile clip on the other end to clip it to one of the rails on the point would do but is a bit more fiddly.