Test normal healthy cluster, see #2195

* Fix that membership listeners should only notified when something changed

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

@@ -0,0 +1,78 @@
+/**
+ *  Copyright (C) 2009-2012 Typesafe Inc. <http://www.typesafe.com>
+ */
+package akka.cluster
+
+import com.typesafe.config.ConfigFactory
+import org.scalatest.BeforeAndAfter
+import akka.remote.testkit.MultiNodeConfig
+import akka.remote.testkit.MultiNodeSpec
+import akka.testkit._
+import akka.util.duration._
+import java.util.concurrent.atomic.AtomicReference
+import scala.collection.immutable.SortedSet
+
+object SunnyWeatherMultiJvmSpec extends MultiNodeConfig {
+  val first = role("first")
+  val second = role("second")
+  val third = role("third")
+  val fourth = role("fourth")
+  val fifth = role("fifth")
+
+  commonConfig(ConfigFactory.parseString("""
+    akka.cluster {
+      gossip-interval = 400 ms
+      nr-of-deputy-nodes = 0
+    }
+    akka.loglevel = DEBUG
+    """))
+}
+
+class SunnyWeatherMultiJvmNode1 extends SunnyWeatherSpec
+class SunnyWeatherMultiJvmNode2 extends SunnyWeatherSpec
+class SunnyWeatherMultiJvmNode3 extends SunnyWeatherSpec
+class SunnyWeatherMultiJvmNode4 extends SunnyWeatherSpec
+class SunnyWeatherMultiJvmNode5 extends SunnyWeatherSpec
+
+abstract class SunnyWeatherSpec
+  extends MultiNodeSpec(SunnyWeatherMultiJvmSpec)
+  with MultiNodeClusterSpec {
+
+  import SunnyWeatherMultiJvmSpec._
+
+  override def initialParticipants = roles.size
+
+  "A normal cluster" must {
+    "be healthy" taggedAs LongRunningTest in {
+
+      // start some
+      awaitClusterUp(first, second, third)
+      runOn(first, second, third) {
+        log.info("3 joined")
+      }
+
+      // add a few more
+      awaitClusterUp(first, second, third, fourth, fifth)
+      log.info("5 joined")
+
+      val unexpected = new AtomicReference[SortedSet[Member]]
+      cluster.registerListener(new MembershipChangeListener {
+        def notify(members: SortedSet[Member]) {
+          // we don't expected any changes to the cluster
+          unexpected.set(members)
+        }
+      })
+
+      for (n ← 1 to 40) {
+        testConductor.enter("period-" + n)
+        unexpected.get must be(null)
+        awaitUpConvergence(roles.size)
+        assertLeaderIn(roles)
+        if (n % 5 == 0) log.info("Passed period [{}]", n)
+        1.seconds.sleep
+      }
+
+      testConductor.enter("after")
+    }
+  }
+}