Not purposely tried it but you can fast for longer periods if your basal insulin is set at the right dose, for example I use to eat supper but stopped this several years ago whilst trying to lose weight and have never gone back, I eat my evening meal around 6pm and don't eat again until 6.30 - 7 the next morning, so that's over a 12 hour fast.
If you plan to eat just 2 meals a day then getting your basal insulin right is a must, but you know yourself a basal test requires a fasting period to check bg levels so fasting isn't an impossibility, (but I still think 3 good meals a day is the best approach and keeps the body nourished & healthy..........but that's just my opinion).