Answering part of my own question: 

I figured out how to watch termination of a typed actor, relying on the 
classic converters which requires the following import import 
akka.actor.typed.scaladsl.adapter._:

"!!! terminate typed actor with ActorTestKit - that's how !!!" in {

  import akka.actor.typed.scaladsl.adapter._

val actorTestKit = ActorTestKit()
implicit val classicActorSystem = actorTestKit.system.toClassic
val probe = TestProbe()
val timeout = actorTestKit.spawn(timeoutBehavior)
probe.watch(timeout.toClassic)
probe.expectTerminated(timeout.toClassic)

}


I assume that's the way to go. If not please let me know. 


Concerning the BehaviorTestKit approach I would still look for an answer.

 "??? terminate typed actor with BehaviorTestKit - but how ???" in {
      val behaviorTestKit = BehaviorTestKit.create(timeoutBehavior)
      //works ...
      behaviorTestKit.expectEffect(ReceiveTimeoutSet(500 millis, "terminated"))
      //...but how to intercept the actual termination (-> Stopped) without 
sending a message???


    }



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