Crank no start issue

Hi guys, been having.A problem with my vehicle. I am not really sure where to go from here. Battery was drained after sitting several days. Jumped it and it started right up and ran fine. Drove about fifteen miles and stopped to get gas. As I got back in the car and tried to start it, the engine would turn over but not fire up. I ruled out fuel problem, and figured out there was no spark coming from coil pack. I replaced coil pack and the car still will not start. I am starting to believe it is the ignition module but how do I know for sure? I do not want to buy it if that is not the problem because those are not cheap. Could it be wires or sensors? Is there a way to test the module?