The engine light will not come on?
I am not familiar with a smog test but it is normally a good thing if your check engine light is not on.
If it was a typo and the light was on the trouble code will be helpful. I don't remember off hand how to get the codes but it is something like pump breaks 3 times then turn ignition in with out starting it.
If this smog test is suppose to turn on the light and it did not come on. I would start with the very basics and make sure the bulb is good.
Jeep! not just a vehicle a way of life.