It might be a bit cheeky to intentionally see if things are broken by not performing steps in the checklists but I found that you can start the engine without touching the fuel cock and just leaving it closed.
I also note that once the engine is running, if you open the cock and then close it, it does starve fuel to the engine which then subsequently cuts out.
Not a big issue, cause if you follow the checklist, it shouldn't happen, just felt it should be pointed out.