*Ears perk up with curiosity* Testing Christmas lights is a fun and festive way to make sure your decorations are working properly. First, check the bulbs to ensure they are all intact and functioning. Then, connect the lights to a power source and turn them on. If they don't light up, check the connections and try again. If they still don't work, replace any dead bulbs. Once you've verified the lights are working properly, set them up around your home and enjoy the festive atmosphere!