override def beforeAll()

in pekko-sample-cluster-scala/src/multi-jvm/scala/sample/cluster/stats/StatsSampleSpec.scala [57:116]
43 lines of code
2 McCabe index (conditional complexity)

  override def beforeAll() = multiNodeSpecBeforeAll()

  override def afterAll() = multiNodeSpecAfterAll()

  implicit val typedSystem: ActorSystem[Nothing] = system.toTyped

  "The stats sample" must {

    "illustrate how to startup cluster" in within(15.seconds) {
      Cluster(system).subscribe(testActor, classOf[MemberUp])
      expectMsgClass(classOf[CurrentClusterState])

      val firstAddress = node(first).address
      val secondAddress = node(second).address
      val thirdAddress = node(third).address

      Cluster(system).join(firstAddress)

      receiveN(3).collect { case MemberUp(m) => m.address }.toSet should be(
        Set(firstAddress, secondAddress, thirdAddress))

      Cluster(system).unsubscribe(testActor)

      testConductor.enter("all-up")
    }

    "show usage of the statsService from one node" in within(15.seconds) {
      runOn(first, second) {
        val worker = system.spawn(StatsWorker(), "StatsWorker")
        val service = system.spawn(StatsService(worker), "StatsService")
        typedSystem.receptionist ! Receptionist.Register(App.StatsServiceKey, service)
      }
      runOn(third) {
        assertServiceOk()
      }

      testConductor.enter("done-2")
    }

    def assertServiceOk(): Unit = {
      // eventually the service should be ok,
      // first attempts might fail because worker actors not started yet
      awaitAssert {
        val probe = TestProbe[AnyRef]()
        typedSystem.receptionist ! Receptionist.Find(App.StatsServiceKey, probe.ref)
        val App.StatsServiceKey.Listing(actors) = probe.expectMessageType[Receptionist.Listing]
        actors should not be empty

        actors.head ! StatsService.ProcessText("this is the text that will be analyzed", probe.ref)
        probe.expectMessageType[StatsService.JobResult].meanWordLength should be(
          3.875 +- 0.001)
      }
    }

    "show usage of the statsService from all nodes" in within(15.seconds) {
      assertServiceOk()
      testConductor.enter("done-3")
    }

  }