XC60 T5 2018 has lockup function on transmission?
 

The older automatic transmissions used to have a lockup function. This would bring a direct connection between the gearbox and engine.
Is this also present on the T5?
I don't see or feel this happening.
When driving on a fixed speed I still see the revs fluctuating a bit. I would expect this to be steady...

How can I see/feel/test if the lock-up is working?