If you like to test for example the steps counter or gyro effect there is no way to do this then on your watch. Would be great to have some sliders for this to see the effect of your design.
If you press play in Facer Creator, Step Count increases from 0 at 12:00 am to several thousand by 11:59 pm. But you’re correct that multi-day complications (like Day of Week) are difficult to test.