What is the expected behavior of remote bangbang?

RemoteExampleForBangBang.scala

package unit.akka

import org.junit.Test
import akka.remote.netty.NettyRemoteSupport
import akka.actor.Actor
import akka.event.slf4j.Logging
import org.scalatest.junit.{ShouldMatchersForJUnit, JUnitSuite}
import org.scalatest.BeforeAndAfterAll
import akka.actor.Actor._
import java.nio.channels.ClosedChannelException

class RemoteMailboxTest extends JUnitSuite with Logging with ShouldMatchersForJUnit with BeforeAndAfterAll {
  def OptimizeLocal = false
  var optimizeLocal_? = remote.asInstanceOf[NettyRemoteSupport].optimizeLocalScoped_?

  override def beforeAll(configMap: Map[String, Any]) {
    if (!OptimizeLocal)
      remote.asInstanceOf[NettyRemoteSupport].optimizeLocal.set(false) //Can't run the test if we're eliminating all remote calls
    remote.start("localhost", 2002)
  }

  override def afterAll(configMap: Map[String, Any]) {
    if (!OptimizeLocal)
      remote.asInstanceOf[NettyRemoteSupport].optimizeLocal.set(optimizeLocal_?) //Reset optimizelocal after all     tests
    Actor.registry.shutdownAll()
    remote.shutdown()
  }
  // doesnt work
  @Test def testRemoteBangBangTimeout() {
    remote.register("strings",actorOf(new TestActor))
    val actorRef = remote.actorFor("strings", "localhost",2003)
    (actorRef !! "test").isDefined should be (false)
  }
  // doesnt work
  @Test def testRemoteBangNoException() {
    remote.register("strings",actorOf(new TestActor))
    val actorRef = remote.actorFor("strings", "localhost",2003)
    actorRef ! "test"
  }
  // works
  @Test(expected = classOf[ClosedChannelException])
  def testRemoteBangBangFailure() {
    remote.register("strings",actorOf(new TestActor))
    val actorRef = remote.actorFor("strings", "localhost",2003)
    (actorRef !! "test").isDefined should be (false)
  }
  //works
  @Test(expected = classOf[ClosedChannelException])
  def testRemoteBangFailure() {
    remote.register("strings",actorOf(new TestActor))
    val actorRef = remote.actorFor("strings", "localhost",2003)
    actorRef ! "test"
  }
}

class TestActor extends Actor {
  def receive = {
    case s:String => self.reply_?(s)
  }
}