When I consider which devices might make it a difficult job, I think of a comparator. Its output is either high impedance, or connected internally to ground.
My first experience with trying to get a comparator to operate was frustrating. I could not tell when it was on or off.
For a while I thought I had broken it and had no idea what I did wrong.
So I tried to think of some non-obvious way to detect whether the output was changing. Finally I connected one lead of my meter to the positive supply, and the other lead to the output. That's when I saw the output changing.
The device worked differently than my normal conception of on/off, or high/low.
If the output goes to high impedance after a delay, then you need to find a way to detect when the output is on, or is sourcing current, or sinking current, or is shorting between two terminals.
If the output is tri-state, then it will take a little more ingenuity.