Merge pull request #1211 from akka/wip-3110-test-thread-dump-rich

Dump diagnostics (Coroner's Report) if a test takes too long. Fixes #3110

akka-cluster/src/multi-jvm/scala/akka/cluster/MultiNodeClusterSpec.scala

@@ -50,16 +50,23 @@ object MultiNodeClusterSpec {
     """)
 }
 
-trait MultiNodeClusterSpec extends Suite with STMultiNodeSpec { self: MultiNodeSpec ⇒
+trait MultiNodeClusterSpec extends Suite with STMultiNodeSpec with WatchedByCoroner { self: MultiNodeSpec ⇒
 
   override def initialParticipants = roles.size
 
   private val cachedAddresses = new ConcurrentHashMap[RoleName, Address]
 
   override def atStartup(): Unit = {
+    startCoroner()
     muteLog()
   }
 
+  override def afterTermination(): Unit = {
+    stopCoroner()
+  }
+
+  override def expectedTestDuration = 60.seconds
+
   def muteLog(sys: ActorSystem = system): Unit = {
     if (!sys.log.isDebugEnabled) {
       Seq(".*Metrics collection has started successfully.*",