code: @Test public void multipleActorsOfTheSameType() throws ExecutionException, InterruptedException {
    List<OrbitStage> stages=new ArrayList<>();
    for (int i=0; i < 10; i++) {
      stages.add(createStage());
    }
    Random r=new Random();
    List<ISomeActor> actors=new ArrayList<>();
    for (int i=0; i < 100; i++) {
      ISomeActor actor=stages.get(r.nextInt(stages.size())).getReference(ISomeActor.class,String.valueOf(i));
      actors.add(actor);
    }
    for (  ISomeActor actor : actors) {
      assertEquals("bla",actor.sayHello("bla").get());
    }
  }
  