Do you have in your company's normal procedues a documented requirement for the takeoff configuration warning to be tested during the preflight scan?
Yes, using both levers individually before start and with the button before takeoff. Before start check was limited to (your) first flight of the day.
The original Boeing checklists on the -200 did not include a T/O warning system test. This was added by individual carriers several years after introduction. I do not know the current Boeing standing on this. Perhaps someone familiar with such a well-seasoned document could elighten us.