Akka: Using a ActorRefFactory to make it easier to test

ParentActor.scala

class ParentActor(childFactory: (ActorRefFactory) => ActorRef) extends Actor {
  def receive: Actor.Receive = {
    case msg @ _ => {
      println(s"Received msg, delegating work to a child actor")
      val childActor = childFactory(context)
      childActor ! "Go and do something important!"
    }
  }
}