Testing for an electrical short

I went to start my car and the battery was low and wouldn't turn the engine over. Battery was checked and is good. Somebody told me that there is probably a short draining the battery. They told me to take 1 cable off the battery and hook the test light clip to the cable and the point of the test light to the terminal. If it lights, there is a short somewhere. Is this the correct way to test it?

Fred B