We call that "testing" in our house
It's not easy while it's happening and is definitely time consuming! Our approach was to take the requests on face value, especially during toilet training. If they said they needed potty, we went there quickly - with only going to the toilet allowed. If nothing was produced in a minute or so, pants on, wash hands etc and out of the room again. As the kids got a little older, we started to say things like "It's a shame you're so tired (whatever behavior/request) right now, I was going to get glitter (or any other interesting thing) out. Ok I'll put you to bed." Strangely enough, not so sleepy after all!
They do get tired of it eventually, as long as you don't enable the manipulation. All the best though - it's exhausting keeping two steps in front!
