I'm not sure about how you could test the actuation capsule, unless you have a suction pump. (Now, if you knew a nurse who may be able to borrow one from a hospital/ambulane/paramedic etc, then the ones for clearing vomit from an airway are ideal

)
If you undo the pipe and apply a vacuum to the end, you should get the wastegate rod to move visibly.
As a thought, if you undo one end of the pipe from the intercooler to the inlet - green arrow on photo......
engine bay.jpg
with the engine running you should be able to feel / hear the pressure of the 'boosted' air coming from the pipe from the intercooler (where it goes into the wing).
The engine will not be pulling air from the pipe with it disconected, but the turbo should still be pushing air through it.
I can't remember if it is noticable at idle speeds, but with a blip of the throttle, it is! This should at least confirm that the compressor wheel is spinning and pressurising the air to give boost.
If you try driving the car with one end of the pipe disconected, then it will be running atmospheric pressure....maybe you will notice a difference with it connected vs disconnected, which will indicate that the turbo is (at least partially) working

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