Replace sleep with latch in valueWithin test

akka-actor/src/test/scala/akka/dispatch/FutureSpec.scala

@@ -277,14 +277,17 @@ class FutureSpec extends JUnitSuite {
   }
 
   @Test def resultWithinShouldNotThrowExceptions {
+    val latch = new StandardLatch
+
     val actors = (1 to 10).toList map { _ =>
       actorOf(new Actor {
-        def receive = { case (add: Int, wait: Int) => Thread.sleep(wait); self reply_? add }
+        def receive = { case (add: Int, wait: Boolean, latch: StandardLatch) => if (wait) latch.await; self reply_? add }
       }).start
     }
 
-    def futures = actors.zipWithIndex map { case (actor: ActorRef, idx: Int) => actor.!!![Int]((idx, if(idx >= 5) 5000 else 0 )) }
+    def futures = actors.zipWithIndex map { case (actor: ActorRef, idx: Int) => actor.!!![Int]((idx, idx >= 5, latch)) }
     val result = for(f <- futures) yield f.valueWithin(2, TimeUnit.SECONDS)
+    latch.open
     val done = result collect { case Some(Right(x)) => x }
     val undone = result collect { case None => None }
     val errors = result collect { case Some(Left(t)) => t }