diff --git a/akka-http-tests/src/test/scala/akka/http/scaladsl/server/DontLeakActorsOnFailingConnectionSpecs.scala b/akka-http-tests/src/test/scala/akka/http/scaladsl/server/DontLeakActorsOnFailingConnectionSpecs.scala
index 9371ff3e3f..790e38b7f8 100644
--- a/akka-http-tests/src/test/scala/akka/http/scaladsl/server/DontLeakActorsOnFailingConnectionSpecs.scala
+++ b/akka-http-tests/src/test/scala/akka/http/scaladsl/server/DontLeakActorsOnFailingConnectionSpecs.scala
@@ -4,23 +4,19 @@
 
 package akka.http.scaladsl.server
 
-import java.net.InetSocketAddress
-import java.nio.channels.ServerSocketChannel
 import java.util.concurrent.{ TimeUnit, CountDownLatch }
 
 import akka.actor.ActorSystem
 import akka.event.Logging
 import akka.http.scaladsl.{ TestUtils, Http }
 import akka.http.scaladsl.model.{ HttpResponse, Uri, HttpRequest }
-import akka.stream.impl.{ StreamSupervisor, ActorMaterializerImpl }
-import akka.stream.{ ActorMaterializer, Materializer, OverflowStrategy }
+import akka.stream.ActorMaterializer
 import akka.stream.scaladsl.{ Sink, Source }
-import akka.testkit.TestProbe
+import akka.stream.testkit.Utils.assertAllStagesStopped
 import com.typesafe.config.ConfigFactory
 import org.scalatest.{ Matchers, BeforeAndAfterAll, WordSpecLike }
 
-import scala.concurrent.duration.FiniteDuration
-import scala.concurrent.{ Await, Future }
+import scala.concurrent.Await
 import scala.concurrent.duration._
 import scala.util.{ Failure, Success, Try }
 
@@ -38,32 +34,10 @@ class DontLeakActorsOnFailingConnectionSpecs extends WordSpecLike with Matchers
 
   val log = Logging(system, getClass)
 
-  // TODO DUPLICATED
-  def assertAllStagesStopped[T](name: String)(block: ⇒ T)(implicit materializer: Materializer): T =
-    materializer match {
-      case impl: ActorMaterializerImpl ⇒
-        val probe = TestProbe()(impl.system)
-        probe.send(impl.supervisor, StreamSupervisor.StopChildren)
-        probe.expectMsg(StreamSupervisor.StoppedChildren)
-        val result = block
-        probe.within(5.seconds) {
-          probe.awaitAssert {
-            impl.supervisor.tell(StreamSupervisor.GetChildren, probe.ref)
-            val children = probe.expectMsgType[StreamSupervisor.Children].children.filter { c ⇒
-              c.path.toString contains name
-            }
-            assert(children.isEmpty,
-              s"expected no StreamSupervisor children, but got [${children.mkString(", ")}]")
-          }
-        }
-        result
-      case _ ⇒ block
-    }
-
   "Http.superPool" should {
 
-    "not leak connection Actors when hitting non-existing endpoint" ignore {
-      assertAllStagesStopped("InternalConnectionFlow") {
+    "not leak connection Actors when hitting non-existing endpoint" in {
+      assertAllStagesStopped {
         val reqsCount = 100
         val clientFlow = Http().superPool[Int]()
         val (_, _, port) = TestUtils.temporaryServerHostnameAndPort()
diff --git a/project/AkkaBuild.scala b/project/AkkaBuild.scala
index b1d00c1d58..64f3377c19 100644
--- a/project/AkkaBuild.scala
+++ b/project/AkkaBuild.scala
@@ -271,7 +271,7 @@ object AkkaBuild extends Build {
   lazy val httpTests = Project(
     id = "akka-http-tests",
     base = file("akka-http-tests"),
-    dependencies = Seq(httpTestkit % "test", testkit % "test->test", httpSprayJson, httpXml, httpJackson)
+    dependencies = Seq(httpTestkit % "test", streamTestkit % "test->test", testkit % "test->test", httpSprayJson, httpXml, httpJackson)
   )
 
   lazy val httpMarshallersScala = Project(