How to test the “On Demand” front wheels drive Xplorer 250

For those of you that have been following my post- you know that I am slowly breathing life into a hand me down Xplorer 250 I got to thinking is there a simple way to test if the automatic AWD works? Can I simply put the whole unit up on block and start it with the electric switch in the "on" position, put it in gear will the front wheels turn then?

Thanks