Make use of scalafix to remove unused import. (#26019)

* =build Add scalafix to remote unused import.

* +build Add file ignore plugin for scalafix which support ignore files.

.scalafix.conf

@@ -0,0 +1,16 @@
+// .scalafix.conf
+rules = [
+  RemoveUnused
+]
+RemoveUnused.imports = true
+RemoveUnused.privates = false
+RemoveUnused.locals = false
+
+//ignored files
+ignored-files = [
+  "TypedBenchmarkActors.scala",
+  "FlowPrependSpec.scala",
+  "FlowZipSpec.scala",
+  "FlowZipWithSpec.scala",
+  "FlowZipWithIndexSpec.scala"
+]

akka-actor-tests/src/test/scala/akka/actor/ActorDSLSpec.scala

@@ -16,7 +16,6 @@ import akka.testkit.TimingTest
 
 class ActorDSLDummy {
   //#import
-  import akka.actor.ActorDSL._
   import akka.actor.ActorSystem
 
   implicit val system = ActorSystem("demo")

akka-actor-tests/src/test/scala/akka/io/dns/internal/TcpDnsClientSpec.scala

@@ -6,9 +6,9 @@ package akka.io.dns.internal
 
 import java.net.InetSocketAddress
 
-import akka.actor.{ Props, Terminated }
+import akka.actor.Props
 import akka.io.Tcp
-import akka.io.Tcp.{ CommandFailed, Connected, PeerClosed, Register }
+import akka.io.Tcp.{ Connected, PeerClosed, Register }
 import akka.io.dns.{ RecordClass, RecordType }
 import akka.io.dns.internal.DnsClient.Answer
 import akka.testkit.{ AkkaSpec, ImplicitSender, TestProbe }

akka-actor-tests/src/test/scala/akka/serialization/AsyncSerializeSpec.scala

@@ -6,7 +6,6 @@ package akka.serialization
 
 import java.util.concurrent.CompletableFuture
 import java.util.concurrent.CompletionStage
-import java.util.concurrent.TimeUnit
 
 import akka.actor.ExtendedActorSystem
 import akka.testkit.{ AkkaSpec, EventFilter }

akka-actor-typed-tests/src/test/scala/akka/actor/typed/WatchSpec.scala

@@ -44,7 +44,6 @@ object WatchSpec {
 
 class WatchSpec extends ScalaTestWithActorTestKit(WatchSpec.config) with WordSpecLike {
   // FIXME why systemActor? spawn?
-  import testKit.systemActor
 
   implicit def untypedSystem = system.toUntyped
 

akka-actor-typed-tests/src/test/scala/akka/actor/typed/scaladsl/ReceivePartialSpec.scala

@@ -9,8 +9,6 @@ import akka.actor.testkit.typed.scaladsl.ScalaTestWithActorTestKit
 import akka.actor.testkit.typed.scaladsl.TestProbe
 import org.scalatest.WordSpecLike
 
-import scala.concurrent.duration._
-
 class ReceivePartialSpec extends ScalaTestWithActorTestKit with WordSpecLike {
 
   implicit val ec = system.executionContext

akka-actor-typed-tests/src/test/scala/docs/akka/typed/IntroSpec.scala

@@ -17,8 +17,6 @@ import akka.actor.testkit.typed.scaladsl.ActorTestKit
 import akka.actor.testkit.typed.scaladsl.ScalaTestWithActorTestKit
 import java.net.URLEncoder
 import java.nio.charset.StandardCharsets
-import scala.concurrent.Await
-import scala.concurrent.duration._
 
 object IntroSpec {
   //format: OFF

akka-actor-typed-tests/src/test/scala/docs/akka/typed/OOIntroSpec.scala

@@ -11,8 +11,6 @@ import java.nio.charset.StandardCharsets
 import akka.actor.typed._
 import akka.actor.typed.scaladsl.{ ActorContext, Behaviors, AbstractBehavior }
 
-import scala.concurrent.duration._
-import scala.concurrent.Await
 import akka.actor.testkit.typed.scaladsl.ScalaTestWithActorTestKit
 import org.scalatest.WordSpecLike
 //#imports

akka-actor-typed/src/main/scala/akka/actor/typed/javadsl/ActorContext.scala

@@ -12,7 +12,6 @@ import akka.annotation.ApiMayChange
 import akka.actor.typed._
 import java.util.Optional
 
-import akka.util.Timeout
 import scala.concurrent.ExecutionContextExecutor
 
 /**

akka-actor-typed/src/main/scala/akka/actor/typed/receptionist/Receptionist.scala

@@ -8,7 +8,6 @@ import akka.actor.typed.{ ActorRef, ActorSystem, Extension, ExtensionId }
 import akka.actor.typed.internal.receptionist._
 import akka.annotation.DoNotInherit
 import scala.collection.JavaConverters._
-import scala.concurrent.duration._
 import scala.reflect.ClassTag
 
 import akka.actor.typed.ExtensionSetup

akka-actor/src/main/scala/akka/actor/TypedActor.scala

@@ -4,7 +4,6 @@
 
 package akka.actor
 
-import language.existentials
 import scala.util.control.NonFatal
 import scala.util.{ Failure, Success, Try }
 import scala.collection.immutable

akka-actor/src/main/scala/akka/io/dns/DnsSettings.scala

@@ -13,7 +13,7 @@ import akka.util.JavaDurationConverters._
 import com.typesafe.config.{ Config, ConfigValueType }
 
 import scala.collection.JavaConverters._
-import scala.collection.{ breakOut, immutable }
+import scala.collection.breakOut
 import scala.concurrent.duration.FiniteDuration
 import scala.util.Try
 

akka-actor/src/main/scala/akka/io/dns/internal/AsyncDnsManager.scala

@@ -4,7 +4,7 @@
 
 package akka.io.dns.internal
 
-import java.net.{ InetAddress, InetSocketAddress }
+import java.net.InetSocketAddress
 import java.util.concurrent.TimeUnit
 
 import akka.actor.{ Actor, ActorLogging, ActorRefFactory, Deploy, Props, Timers }
@@ -16,7 +16,6 @@ import akka.io.{ Dns, DnsExt, PeriodicCacheCleanup }
 import akka.routing.FromConfig
 import akka.util.Timeout
 
-import scala.collection.immutable
 import scala.concurrent.duration.Duration
 
 /**

akka-actor/src/main/scala/akka/io/dns/internal/TcpDnsClient.scala

@@ -10,8 +10,8 @@ import akka.AkkaException
 import akka.actor.{ Actor, ActorLogging, ActorRef, Stash }
 import akka.annotation.InternalApi
 import akka.io.Tcp._
-import akka.io.dns.internal.DnsClient.{ Answer, DnsQuestion, Question4 }
+import akka.io.dns.internal.DnsClient.Answer
-import akka.io.{ IO, Tcp }
+import akka.io.Tcp
 import akka.util.ByteString
 
 /**
@@ -20,8 +20,6 @@ import akka.util.ByteString
 @InternalApi private[akka] class TcpDnsClient(tcp: ActorRef, ns: InetSocketAddress, answerRecipient: ActorRef) extends Actor with ActorLogging with Stash {
   import TcpDnsClient._
 
-  import context.system
-
   override def receive: Receive = idle
 
   val idle: Receive = {

akka-actor/src/main/scala/akka/pattern/BackoffSupervisor.scala

@@ -8,7 +8,7 @@ import java.util.concurrent.ThreadLocalRandom
 import java.util.Optional
 
 import akka.actor.{ Actor, ActorLogging, ActorRef, DeadLetterSuppression, OneForOneStrategy, Props, SupervisorStrategy, Terminated }
-import akka.actor.SupervisorStrategy.{ Directive, Escalate, Restart, Stop }
+import akka.actor.SupervisorStrategy.{ Directive, Escalate }
 import akka.util.JavaDurationConverters._
 
 import scala.concurrent.duration.{ Duration, FiniteDuration }

akka-actor/src/main/scala/akka/util/ManifestInfo.scala

@@ -15,7 +15,6 @@ import akka.actor.ExtendedActorSystem
 import akka.actor.Extension
 import akka.actor.ExtensionId
 import akka.actor.ExtensionIdProvider
-import akka.annotation.InternalApi
 import akka.event.Logging
 
 /**

akka-bench-jmh/src/main/scala/akka/actor/typed/TypedActorBenchmark.scala

@@ -4,7 +4,7 @@
 
 package akka.actor.typed
 
-import java.util.concurrent.{ CountDownLatch, TimeUnit }
+import java.util.concurrent.TimeUnit
 
 import com.typesafe.config.ConfigFactory
 import org.openjdk.jmh.annotations._

akka-bench-jmh/src/main/scala/akka/actor/typed/TypedBenchmarkActors.scala

@@ -4,12 +4,8 @@
 
 package akka.actor.typed
 
-import java.util.concurrent.{ CountDownLatch, TimeUnit }
-
 import akka.Done
-import akka.actor.typed.scaladsl.{ Behaviors, AbstractBehavior }
+import akka.actor.typed.scaladsl.Behaviors
-import akka.actor.typed.scaladsl.{ ActorContext ⇒ SActorContext }
-
 import scala.concurrent.duration._
 
 object TypedBenchmarkActors {

akka-cluster-metrics/src/multi-jvm/scala/akka/cluster/metrics/ClusterMetricsExtensionSpec.scala

@@ -9,9 +9,7 @@ import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
-import akka.actor.ExtendedActorSystem
 import akka.cluster.MultiNodeClusterSpec
-import akka.testkit.LongRunningTest
 import akka.cluster.MemberStatus
 
 trait ClusterMetricsCommonConfig extends MultiNodeConfig {
@@ -61,7 +59,6 @@ object ClusterMetricsDisabledConfig extends ClusterMetricsCommonConfig {
 }
 
 object ClusterMetricsEnabledConfig extends ClusterMetricsCommonConfig {
-  import ConfigFactory._
 
   commonConfig {
     Seq(
@@ -136,7 +133,6 @@ class ClusterMetricsDisabledMultiJvmNode5 extends ClusterMetricsDisabledSpec
 
 abstract class ClusterMetricsDisabledSpec extends MultiNodeSpec(ClusterMetricsDisabledConfig)
   with MultiNodeClusterSpec with RedirectLogging {
-  import akka.cluster.ClusterEvent.CurrentClusterState
 
   val metricsView = new ClusterMetricsView(cluster.system)
 

akka-cluster-sharding-typed/src/main/scala/akka/cluster/sharding/typed/ClusterShardingSettings.scala

@@ -4,7 +4,7 @@
 
 package akka.cluster.sharding.typed
 
-import scala.concurrent.duration.{ Duration, FiniteDuration }
+import scala.concurrent.duration.FiniteDuration
 import akka.actor.NoSerializationVerificationNeeded
 import akka.actor.typed.ActorSystem
 import akka.annotation.InternalApi

akka-cluster-sharding-typed/src/main/scala/akka/cluster/sharding/typed/javadsl/PersistentEntity.scala

@@ -6,10 +6,7 @@ package akka.cluster.sharding.typed.javadsl
 
 import java.util.Optional
 
-import scala.compat.java8.OptionConverters._
-
 import akka.actor.typed.BackoffSupervisorStrategy
-import akka.actor.typed.Behavior
 import akka.persistence.typed.PersistenceId
 import akka.persistence.typed.javadsl.PersistentBehavior
 

akka-cluster-sharding-typed/src/main/scala/akka/cluster/sharding/typed/scaladsl/PersistentEntity.scala

@@ -4,7 +4,6 @@
 
 package akka.cluster.sharding.typed.scaladsl
 
-import akka.actor.typed.Behavior
 import akka.persistence.typed.scaladsl.Effect
 import akka.persistence.typed.scaladsl.PersistentBehavior
 

akka-cluster-sharding-typed/src/test/scala/akka/cluster/sharding/typed/scaladsl/ClusterShardingPersistenceSpec.scala

@@ -8,7 +8,6 @@ import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.TimeUnit
 
-import scala.concurrent.duration._
 import scala.concurrent.ExecutionContext
 import scala.concurrent.Future
 import scala.concurrent.Promise

akka-cluster-sharding-typed/src/test/scala/akka/cluster/sharding/typed/scaladsl/ClusterShardingSpec.scala

@@ -10,7 +10,6 @@ import scala.concurrent.duration._
 import scala.util.Failure
 import scala.util.Success
 
-import akka.Done
 import akka.actor.ExtendedActorSystem
 import akka.actor.testkit.typed.scaladsl.ActorTestKit
 import akka.actor.testkit.typed.scaladsl.ScalaTestWithActorTestKit

akka-cluster-tools/src/test/scala/akka/cluster/singleton/ClusterSingletonLeavingSpeedSpec.scala

@@ -16,7 +16,6 @@ import akka.cluster.Cluster
 import akka.cluster.MemberStatus
 import akka.cluster.singleton.ClusterSingletonLeavingSpeedSpec.TheSingleton
 import akka.testkit.AkkaSpec
-import akka.testkit.TestActors
 import akka.testkit.TestProbe
 import com.typesafe.config.ConfigFactory
 

akka-cluster-typed/src/main/scala/akka/cluster/ddata/typed/internal/ReplicatorBehavior.scala

@@ -6,7 +6,6 @@ package akka.cluster.ddata.typed.internal
 
 import scala.compat.java8.OptionConverters._
 import scala.concurrent.duration._
-import scala.concurrent.duration.Duration
 
 import akka.annotation.InternalApi
 import akka.cluster.{ ddata ⇒ dd }

akka-cluster-typed/src/main/scala/akka/cluster/typed/internal/AdaptedClusterImpl.scala

@@ -4,7 +4,6 @@
 
 package akka.cluster.typed.internal
 
-import akka.actor.ExtendedActorSystem
 import akka.actor.typed.Props
 import akka.annotation.InternalApi
 import akka.cluster.ClusterEvent.MemberEvent

akka-cluster-typed/src/main/scala/akka/cluster/typed/internal/receptionist/ClusterReceptionist.scala

@@ -13,12 +13,11 @@ import akka.actor.typed.{ ActorRef, Behavior, Terminated }
 import akka.annotation.InternalApi
 import akka.cluster.ClusterEvent.MemberRemoved
 import akka.cluster.ddata.{ DistributedData, ORMultiMap, ORMultiMapKey, Replicator }
-import akka.cluster.{ Cluster, ClusterEvent, MemberStatus, UniqueAddress }
+import akka.cluster.{ Cluster, ClusterEvent, UniqueAddress }
 import akka.remote.AddressUidExtension
 import akka.util.TypedMultiMap
 
 import scala.concurrent.duration._
-import scala.language.existentials
 
 /** INTERNAL API */
 @InternalApi

akka-cluster-typed/src/main/scala/akka/cluster/typed/internal/receptionist/Registry.scala

@@ -11,7 +11,6 @@ import akka.annotation.InternalApi
 import akka.cluster.{ Cluster, UniqueAddress }
 import akka.cluster.ddata.{ ORMultiMap, ORMultiMapKey }
 import akka.cluster.typed.internal.receptionist.ClusterReceptionist.{ DDataKey, EmptyORMultiMap, Entry }
-import akka.util.Timeout
 
 import scala.concurrent.duration.Deadline
 

akka-cluster-typed/src/multi-jvm/scala/akka/cluster/typed/MultiNodeTypedClusterSpec.scala

@@ -4,7 +4,6 @@
 
 package akka.cluster.typed
 
-import java.util.UUID
 import java.util.concurrent.ConcurrentHashMap
 
 import akka.actor.{ Address, Scheduler }
@@ -15,7 +14,6 @@ import org.scalatest.{ Matchers, Suite }
 import akka.actor.typed.scaladsl.adapter._
 import akka.cluster.{ ClusterEvent, MemberStatus }
 import akka.remote.testconductor.RoleName
-import com.typesafe.config.{ Config, ConfigFactory }
 
 import scala.concurrent.duration._
 import scala.language.implicitConversions

akka-cluster-typed/src/test/scala/akka/cluster/ddata/typed/scaladsl/ReplicatorSpec.scala

@@ -15,7 +15,7 @@ import akka.actor.typed.scaladsl.Behaviors
 import akka.actor.typed.scaladsl.adapter._
 import akka.cluster.Cluster
 import akka.cluster.ddata.typed.scaladsl.Replicator._
-import akka.cluster.ddata.{ GCounter, GCounterKey, ReplicatedData }
+import akka.cluster.ddata.{ GCounter, GCounterKey }
 import akka.actor.testkit.typed.scaladsl._
 import akka.util.Timeout
 import com.typesafe.config.ConfigFactory

akka-cluster-typed/src/test/scala/akka/cluster/typed/RemoteDeployNotAllowedSpec.scala

@@ -12,7 +12,7 @@ import com.typesafe.config.ConfigFactory
 import scala.concurrent.duration._
 import akka.actor.testkit.typed.scaladsl.ActorTestKit
 import akka.actor.testkit.typed.scaladsl.ScalaTestWithActorTestKit
-import org.scalatest.{ WordSpec, WordSpecLike }
+import org.scalatest.WordSpecLike
 
 object RemoteDeployNotAllowedSpec {
   def config = ConfigFactory.parseString(

akka-cluster-typed/src/test/scala/akka/cluster/typed/internal/receptionist/ClusterReceptionistSpec.scala

@@ -10,7 +10,7 @@ import akka.actor.{ ExtendedActorSystem, RootActorPath }
 import akka.actor.typed.receptionist.{ Receptionist, ServiceKey }
 import akka.actor.typed.scaladsl.Behaviors
 import akka.actor.typed.scaladsl.adapter._
-import akka.actor.typed.{ ActorRef, ActorRefResolver, scaladsl }
+import akka.actor.typed.{ ActorRef, ActorRefResolver }
 import akka.cluster.MemberStatus
 import akka.cluster.typed.{ Cluster, Join }
 import akka.serialization.SerializerWithStringManifest

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

@@ -12,7 +12,7 @@ import akka.actor.Identify
 import akka.actor.Props
 import akka.remote.transport.ThrottlerTransportAdapter.Direction
 import akka.testkit._
-import akka.remote.testkit.{ STMultiNodeSpec, MultiNodeConfig, MultiNodeSpec }
+import akka.remote.testkit.{ MultiNodeConfig, MultiNodeSpec }
 import akka.actor.PoisonPill
 
 object AttemptSysMsgRedeliveryMultiJvmSpec extends MultiNodeConfig {

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

@@ -4,12 +4,9 @@
 
 package akka.cluster
 
-import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
-import akka.actor.Address
-import scala.collection.immutable
 
 final case class ClientDowningNodeThatIsUnreachableMultiNodeConfig(failureDetectorPuppet: Boolean) extends MultiNodeConfig {
   val first = role("first")

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

@@ -4,13 +4,9 @@
 
 package akka.cluster
 
-import com.typesafe.config.ConfigFactory
-import scala.concurrent.duration._
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
-import akka.actor.Address
-import scala.collection.immutable
 
 final case class ClientDowningNodeThatIsUpMultiNodeConfig(failureDetectorPuppet: Boolean) extends MultiNodeConfig {
   val first = role("first")

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

@@ -6,7 +6,6 @@ package akka.cluster
 
 import scala.collection.immutable
 import com.typesafe.config.ConfigFactory
-import org.scalatest.BeforeAndAfter
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._

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

@@ -4,7 +4,6 @@
 
 package akka.cluster
 
-import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._

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

@@ -7,8 +7,6 @@ package akka.cluster
 import language.postfixOps
 import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
-import akka.actor.Actor
-import akka.actor.Props
 import akka.cluster.ClusterEvent.CurrentClusterState
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec

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

@@ -5,7 +5,6 @@
 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._

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

@@ -5,12 +5,9 @@
 package akka.cluster
 
 import scala.collection.immutable
-import com.typesafe.config.ConfigFactory
-import org.scalatest.BeforeAndAfter
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
-import scala.concurrent.duration._
 import akka.actor.Address
 
 object JoinSeedNodeMultiJvmSpec extends MultiNodeConfig {

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

@@ -11,7 +11,6 @@ import akka.actor.ActorRef
 import akka.actor.ExtendedActorSystem
 import akka.actor.Identify
 import akka.cluster.ClusterEvent.UnreachableMember
-import akka.remote.RARP
 import akka.remote.artery.ArterySettings
 import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig

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

@@ -38,7 +38,6 @@ abstract class LeaderDowningAllOtherNodesSpec
   with MultiNodeClusterSpec {
 
   import LeaderDowningAllOtherNodesMultiJvmSpec._
-  import ClusterEvent._
 
   "A cluster of 6 nodes with monitored-by-nr-of-members=2" must {
     "setup" taggedAs LongRunningTest in {

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

@@ -10,9 +10,7 @@ import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
-import akka.actor._
 import scala.concurrent.duration._
-import scala.collection.immutable
 
 final case class LeaderDowningNodeThatIsUnreachableMultiNodeConfig(failureDetectorPuppet: Boolean) extends MultiNodeConfig {
   val first = role("first")

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

@@ -5,12 +5,10 @@
 package akka.cluster
 
 import language.postfixOps
-import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
 import scala.concurrent.duration._
-import scala.collection.immutable
 
 final case class LeaderElectionMultiNodeConfig(failureDetectorPuppet: Boolean) extends MultiNodeConfig {
   val controller = role("controller")

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

@@ -4,7 +4,6 @@
 
 package akka.cluster
 
-import scala.collection.immutable.SortedSet
 import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec

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

@@ -13,7 +13,6 @@ import javax.management.ObjectName
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
-import scala.util.Try
 
 object MBeanMultiJvmSpec extends MultiNodeConfig {
   val first = role("first")
@@ -38,7 +37,6 @@ abstract class MBeanSpec
   with MultiNodeClusterSpec {
 
   import MBeanMultiJvmSpec._
-  import ClusterEvent._
 
   val mbeanName = new ObjectName("akka:type=Cluster")
   lazy val mbeanServer = ManagementFactory.getPlatformMBeanServer

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

@@ -4,13 +4,9 @@
 
 package akka.cluster
 
-import scala.collection.immutable.SortedSet
-import org.scalatest.BeforeAndAfter
-import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
-import scala.concurrent.duration._
 import akka.actor.Props
 import akka.actor.Actor
 import akka.cluster.MemberStatus._

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

@@ -4,8 +4,6 @@
 
 package akka.cluster
 
-import scala.collection.immutable.SortedSet
-import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._

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

@@ -5,16 +5,10 @@
 package akka.cluster
 
 import com.typesafe.config.ConfigFactory
-import org.scalatest.BeforeAndAfter
-import scala.collection.immutable.SortedSet
-import scala.concurrent.duration._
 import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
-import java.util.concurrent.atomic.AtomicReference
-import akka.actor.Props
-import akka.actor.Actor
 import akka.cluster.MemberStatus._
 
 object MinMembersBeforeUpMultiJvmSpec extends MultiNodeConfig {
@@ -109,8 +103,6 @@ abstract class MinMembersBeforeUpBase(multiNodeConfig: MultiNodeConfig)
   extends MultiNodeSpec(multiNodeConfig)
   with MultiNodeClusterSpec {
 
-  import ClusterEvent._
-
   def first: RoleName
   def second: RoleName
   def third: RoleName

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

@@ -14,7 +14,6 @@ import com.typesafe.config.ConfigFactory
 
 import scala.collection.immutable
 import scala.concurrent.duration._
-import scala.language.postfixOps
 
 object NodeChurnMultiJvmSpec extends MultiNodeConfig {
   val first = role("first")

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

@@ -4,7 +4,6 @@
 
 package akka.cluster
 
-import scala.collection.immutable.SortedSet
 import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec

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

@@ -4,8 +4,6 @@
 
 package akka.cluster
 
-import scala.collection.immutable.SortedSet
-import com.typesafe.config.ConfigFactory
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._

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

@@ -4,8 +4,6 @@
 
 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._

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

@@ -7,14 +7,12 @@ package akka.cluster
 import java.util.concurrent.ThreadLocalRandom
 
 import akka.actor.{ ActorSystem, Address }
-import akka.remote.RARP
 import akka.remote.testkit.{ MultiNodeConfig, MultiNodeSpec }
 import akka.testkit._
 import com.typesafe.config.ConfigFactory
 
 import scala.collection.immutable
 import scala.concurrent.duration._
-import scala.language.postfixOps
 
 // This test was a reproducer for issue #20639
 object QuickRestartMultiJvmSpec extends MultiNodeConfig {

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

@@ -7,7 +7,6 @@ package akka.cluster
 import language.postfixOps
 import scala.collection.immutable
 import com.typesafe.config.ConfigFactory
-import org.scalatest.BeforeAndAfter
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
@@ -20,7 +19,6 @@ import akka.actor.Actor
 import akka.actor.RootActorPath
 import akka.cluster.MemberStatus._
 import akka.actor.Deploy
-import akka.remote.RARP
 
 object RestartFirstSeedNodeMultiJvmSpec extends MultiNodeConfig {
   val seed1 = role("seed1")

akka-cluster/src/multi-jvm/scala/akka/cluster/RestartNode2Spec.scala

@@ -13,9 +13,7 @@ import akka.actor.Address
 import akka.actor.Deploy
 import akka.actor.Props
 import akka.actor.RootActorPath
-import akka.cluster.ClusterEvent._
 import akka.cluster.MemberStatus._
-import akka.remote.AddressUidExtension
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._

akka-cluster/src/multi-jvm/scala/akka/cluster/RestartNode3Spec.scala

@@ -13,7 +13,6 @@ import akka.actor.Deploy
 import akka.actor.Props
 import akka.actor.RootActorPath
 import akka.cluster.MemberStatus._
-import akka.remote.RARP
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.remote.transport.ThrottlerTransportAdapter.Direction

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

@@ -11,9 +11,7 @@ import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.testkit._
 import scala.concurrent.duration._
-import akka.actor.Address
 import scala.concurrent.duration._
-import scala.collection.immutable
 import akka.remote.transport.ThrottlerTransportAdapter.Direction
 
 final case class SplitBrainMultiNodeConfig(failureDetectorPuppet: Boolean) extends MultiNodeConfig {

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

@@ -9,7 +9,6 @@ import scala.annotation.tailrec
 import scala.collection.immutable
 import scala.concurrent.duration._
 import java.util.concurrent.ThreadLocalRandom
-import java.util.concurrent.atomic.AtomicReference
 import org.scalatest.BeforeAndAfterEach
 import com.typesafe.config.Config
 import com.typesafe.config.ConfigFactory
@@ -257,8 +256,6 @@ private[cluster] object StressMultiJvmSpec extends MultiNodeConfig {
       immutable.SortedMap.empty[Address, CurrentInternalStats]
     }
 
-    import context.dispatcher
-
     def receive = {
       case PhiResult(from, phiValues) ⇒ phiValuesObservedByNode += from → phiValues
       case StatsResult(from, stats)   ⇒ clusterStatsObservedByNode += from → stats
@@ -290,7 +287,6 @@ private[cluster] object StressMultiJvmSpec extends MultiNodeConfig {
     def formatPhi: String = {
       if (phiValuesObservedByNode.isEmpty) ""
       else {
-        import akka.cluster.Member.addressOrdering
         val lines =
           for {
             (monitor, phiValues) ← phiValuesObservedByNode
@@ -672,7 +668,6 @@ abstract class StressSpec
   }) with MultiNodeClusterSpec with BeforeAndAfterEach with ImplicitSender {
 
   import StressMultiJvmSpec._
-  import ClusterEvent._
 
   val settings = new Settings(system.settings.config)
   import settings._

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

@@ -5,11 +5,9 @@
 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 scala.concurrent.duration._
 import java.util.concurrent.atomic.AtomicReference
 import scala.collection.immutable.SortedSet
 import akka.actor.Props

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

@@ -11,18 +11,15 @@ import akka.remote.transport.ThrottlerTransportAdapter.Direction
 
 import scala.concurrent.duration._
 import akka.testkit._
-import akka.testkit.TestEvent._
-import java.util.concurrent.ThreadLocalRandom
 
 import akka.remote.testconductor.RoleName
 import akka.actor.Props
 import akka.actor.Actor
 
 import scala.util.control.NoStackTrace
-import akka.remote.{ QuarantinedEvent, RARP, RemoteActorRefProvider }
+import akka.remote.{ QuarantinedEvent, RemoteActorRefProvider }
 import akka.actor.ExtendedActorSystem
 import akka.actor.ActorRef
-import akka.dispatch.sysmsg.Failed
 import akka.actor.PoisonPill
 import akka.actor.Terminated
 

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

@@ -16,10 +16,7 @@ import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.remote.transport.ThrottlerTransportAdapter.Direction
 import akka.testkit._
-import akka.actor.Actor
-import akka.actor.ActorRef
 import akka.actor.Props
-import akka.actor.RootActorPath
 import akka.cluster.MultiNodeClusterSpec.EndActor
 import akka.remote.RARP
 

akka-cluster/src/multi-jvm/scala/akka/cluster/routing/ClusterConsistentHashingRouterSpec.scala

@@ -5,7 +5,6 @@
 package akka.cluster.routing
 
 import scala.concurrent.Await
-import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
 import akka.actor.Actor
 import akka.actor.ActorRef
@@ -15,7 +14,6 @@ import akka.cluster.MultiNodeClusterSpec
 import akka.pattern.ask
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
-import akka.routing.ConsistentHashingRouter
 import akka.routing.ConsistentHashingRouter.ConsistentHashMapping
 import akka.routing.ConsistentHashingRouter.ConsistentHashableEnvelope
 import akka.routing.GetRoutees

akka-distributed-data/src/multi-jvm/scala/akka/cluster/ddata/ReplicatorMapDeltaSpec.scala

@@ -7,7 +7,7 @@ package akka.cluster.ddata
 import java.util.concurrent.ThreadLocalRandom
 
 import scala.concurrent.duration._
-import akka.cluster.{ Cluster, ddata }
+import akka.cluster.Cluster
 import akka.cluster.ddata.Replicator._
 import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig

akka-persistence-typed/src/main/scala/akka/persistence/typed/SideEffect.scala

@@ -6,7 +6,7 @@ package akka.persistence.typed
 
 import akka.actor.typed.ActorRef
 import akka.japi.function
-import akka.annotation.{ DoNotInherit, InternalApi }
+import akka.annotation.InternalApi
 
 /**
  * A [[SideEffect]] is an side effect that can be chained after a main effect.

akka-persistence-typed/src/main/scala/akka/persistence/typed/internal/EventsourcedBehavior.scala

@@ -7,8 +7,6 @@ package akka.persistence.typed.internal
 import java.util.UUID
 import java.util.concurrent.atomic.AtomicInteger
 
-import akka.actor.typed.Behavior
-import akka.actor.typed.scaladsl.Behaviors
 import akka.annotation.InternalApi
 import akka.persistence.typed.PersistenceId
 

akka-persistence-typed/src/main/scala/akka/persistence/typed/internal/EventsourcedReplayingSnapshot.scala

@@ -5,7 +5,7 @@
 package akka.persistence.typed.internal
 
 import akka.actor.typed.scaladsl.Behaviors.same
-import akka.actor.typed.scaladsl.{ Behaviors, TimerScheduler }
+import akka.actor.typed.scaladsl.Behaviors
 import akka.actor.typed.Behavior
 import akka.actor.typed.internal.PoisonPill
 import akka.annotation.InternalApi

akka-persistence-typed/src/main/scala/akka/persistence/typed/scaladsl/Effect.scala

@@ -5,7 +5,7 @@
 package akka.persistence.typed.scaladsl
 
 import akka.annotation.DoNotInherit
-import akka.persistence.typed.{ SideEffect, Stop }
+import akka.persistence.typed.SideEffect
 import akka.persistence.typed.internal._
 import scala.collection.{ immutable ⇒ im }
 

akka-persistence-typed/src/test/scala/akka/persistence/typed/scaladsl/PersistentBehaviorReplySpec.scala

@@ -7,29 +7,15 @@ package akka.persistence.typed.scaladsl
 import java.util.UUID
 import java.util.concurrent.atomic.AtomicInteger
 
-import scala.concurrent.duration._
-import scala.util.Success
-import scala.util.Try
-
 import akka.Done
-import akka.actor.testkit.typed.TestKitSettings
 import akka.actor.testkit.typed.scaladsl._
 import akka.actor.typed.scaladsl.Behaviors
 import akka.actor.typed.ActorRef
 import akka.actor.typed.ActorSystem
 import akka.actor.typed.Behavior
-import akka.actor.typed.SupervisorStrategy
-import akka.actor.typed.Terminated
 import akka.actor.typed.scaladsl.ActorContext
-import akka.persistence.journal.inmem.InmemJournal
-import akka.persistence.query.journal.leveldb.scaladsl.LeveldbReadJournal
-import akka.persistence.query.EventEnvelope
-import akka.persistence.query.PersistenceQuery
-import akka.persistence.query.Sequence
 import akka.persistence.typed.ExpectingReply
 import akka.persistence.typed.PersistenceId
-import akka.stream.ActorMaterializer
-import akka.stream.scaladsl.Sink
 import com.typesafe.config.Config
 import com.typesafe.config.ConfigFactory
 import org.scalatest.WordSpecLike

akka-persistence/src/test/scala/akka/persistence/OptimizedRecoverySpec.scala

@@ -4,7 +4,6 @@
 
 package akka.persistence
 
-import akka.actor.ActorLogging
 import akka.actor.ActorRef
 import akka.actor.Props
 import akka.testkit.ImplicitSender

akka-remote-tests/src/multi-jvm/scala/akka/remote/AttemptSysMsgRedeliverySpec.scala

@@ -12,7 +12,7 @@ import akka.actor.Identify
 import akka.actor.Props
 import akka.remote.transport.ThrottlerTransportAdapter.Direction
 import akka.testkit._
-import testkit.{ STMultiNodeSpec, MultiNodeConfig, MultiNodeSpec }
+import testkit.MultiNodeConfig
 import akka.actor.PoisonPill
 import com.typesafe.config.ConfigFactory
 

akka-remote-tests/src/multi-jvm/scala/akka/remote/LookupRemoteActorSpec.scala

@@ -8,7 +8,7 @@ import akka.actor.Actor
 import akka.actor.ActorRef
 import akka.actor.Props
 import akka.pattern.ask
-import testkit.{ STMultiNodeSpec, MultiNodeConfig, MultiNodeSpec }
+import testkit.MultiNodeConfig
 import akka.testkit._
 import akka.actor.Identify
 import akka.actor.ActorIdentity

akka-remote-tests/src/multi-jvm/scala/akka/remote/NewRemoteActorSpec.scala

@@ -10,8 +10,7 @@ import language.postfixOps
 import akka.actor.Actor
 import akka.actor.ActorRef
 import akka.actor.Props
-import testkit.{ STMultiNodeSpec, MultiNodeConfig, MultiNodeSpec }
+import testkit.MultiNodeConfig
-import akka.testkit._
 import com.typesafe.config.ConfigFactory
 import scala.concurrent.duration._
 

akka-remote-tests/src/multi-jvm/scala/akka/remote/PiercingShouldKeepQuarantineSpec.scala

@@ -8,8 +8,7 @@ import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
 import akka.actor._
 import akka.testkit._
-import akka.remote.testkit.{ MultiNodeConfig, MultiNodeSpec, STMultiNodeSpec }
+import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testconductor.RoleName
 
 class PiercingShouldKeepQuarantineConfig(artery: Boolean) extends MultiNodeConfig {
   val first = role("first")

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteDeliverySpec.scala

@@ -13,9 +13,6 @@ import akka.actor.ActorRef
 import akka.actor.Props
 import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
-import akka.testkit._
 import akka.actor.ActorIdentity
 import akka.actor.Identify
 

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteDeploymentDeathWatchSpec.scala

@@ -13,10 +13,7 @@ import akka.actor.Actor
 import akka.actor.ActorSystemImpl
 import akka.actor.Props
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.testkit._
-import akka.testkit.TestEvent._
 
 class RemoteDeploymentDeathWatchMultiJvmSpec(artery: Boolean) extends MultiNodeConfig {
   val first = role("first")

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteGatePiercingSpec.scala

@@ -6,15 +6,12 @@ package akka.remote
 
 import akka.remote.transport.AssociationHandle
 
-import language.postfixOps
 import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
 import akka.actor._
 import akka.remote.testconductor.RoleName
-import akka.remote.transport.ThrottlerTransportAdapter.{ ForceDisassociateExplicitly, ForceDisassociate, Direction }
+import akka.remote.transport.ThrottlerTransportAdapter.ForceDisassociateExplicitly
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.testkit._
 import akka.actor.ActorIdentity
 import akka.remote.testconductor.RoleName

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteNodeRestartDeathWatchSpec.scala

@@ -4,7 +4,6 @@
 
 package akka.remote
 
-import language.postfixOps
 import scala.concurrent.Await
 import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
@@ -13,12 +12,9 @@ import akka.actor.ActorIdentity
 import akka.actor.ActorRef
 import akka.actor.Identify
 import akka.actor.Props
-import akka.actor.Terminated
 import akka.remote.testconductor.RoleName
 import akka.remote.transport.ThrottlerTransportAdapter.Direction
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.testkit._
 import akka.actor.ExtendedActorSystem
 import akka.actor.ActorSystem

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteNodeRestartGateSpec.scala

@@ -6,15 +6,12 @@ package akka.remote
 
 import akka.remote.transport.AssociationHandle
 
-import language.postfixOps
 import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
 import akka.actor._
 import akka.remote.testconductor.RoleName
-import akka.remote.transport.ThrottlerTransportAdapter.{ ForceDisassociateExplicitly, ForceDisassociate, Direction }
+import akka.remote.transport.ThrottlerTransportAdapter.ForceDisassociateExplicitly
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.testkit._
 import akka.actor.ActorIdentity
 import akka.remote.testconductor.RoleName

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteNodeShutdownAndComesBackSpec.scala

@@ -11,8 +11,6 @@ import akka.actor._
 import akka.remote.testconductor.RoleName
 import akka.remote.transport.ThrottlerTransportAdapter.{ ForceDisassociate, Direction }
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.testkit._
 import akka.actor.ActorIdentity
 import akka.remote.testconductor.RoleName

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteQuarantinePiercingSpec.scala

@@ -4,19 +4,13 @@
 
 package akka.remote
 
-import language.postfixOps
 import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
 import akka.actor._
 import akka.remote.testconductor.RoleName
-import akka.remote.transport.ThrottlerTransportAdapter.{ ForceDisassociate, Direction }
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.testkit._
-import akka.actor.ActorIdentity
 import akka.remote.testconductor.RoleName
-import akka.actor.Identify
 import scala.concurrent.Await
 
 class RemoteQuarantinePiercingConfig(artery: Boolean) extends MultiNodeConfig {

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteReDeploymentSpec.scala

@@ -5,9 +5,6 @@
 package akka.remote
 
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
-import akka.testkit.ImplicitSender
 import akka.actor.Actor
 import akka.actor.ActorRef
 import akka.actor.Props
@@ -20,7 +17,6 @@ import scala.concurrent.duration._
 import akka.actor.ActorIdentity
 import akka.actor.ActorLogging
 import akka.actor.Identify
-import akka.remote.testconductor.TestConductor
 import akka.testkit.TestProbe
 
 class RemoteReDeploymentConfig(artery: Boolean) extends MultiNodeConfig {

akka-remote-tests/src/multi-jvm/scala/akka/remote/RemoteRestartedQuarantinedSpec.scala

@@ -4,17 +4,12 @@
 
 package akka.remote
 
-import akka.remote.transport.AssociationHandle
-
 import language.postfixOps
 import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
 import akka.actor._
 import akka.remote.testconductor.RoleName
-import akka.remote.transport.ThrottlerTransportAdapter.{ ForceDisassociateExplicitly, ForceDisassociate, Direction }
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.testkit._
 import akka.actor.ActorIdentity
 import akka.remote.testconductor.RoleName

akka-remote-tests/src/multi-jvm/scala/akka/remote/Ticket15109Spec.scala

@@ -4,21 +4,17 @@
 
 package akka.remote
 
-import language.postfixOps
 import scala.concurrent.duration._
 import com.typesafe.config.ConfigFactory
 import akka.actor._
 import akka.remote.testconductor.RoleName
 import akka.remote.transport.ThrottlerTransportAdapter.ForceDisassociateExplicitly
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.testkit._
 import akka.actor.ActorIdentity
 import akka.remote.testconductor.RoleName
 import akka.actor.Identify
 import scala.concurrent.Await
-import akka.remote.transport.Transport.InvalidAssociationException
 import akka.remote.transport.AssociationHandle
 
 object Ticket15109Spec extends MultiNodeConfig {

akka-remote-tests/src/multi-jvm/scala/akka/remote/TransportFailSpec.scala

@@ -7,7 +7,6 @@ package akka.remote
 import java.util.concurrent.atomic.AtomicBoolean
 
 import scala.concurrent.duration._
-import scala.language.postfixOps
 
 import akka.actor.Actor
 import akka.actor.ActorIdentity

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/FanInThrougputSpec.scala

@@ -4,25 +4,16 @@
 
 package akka.remote.artery
 
-import java.nio.ByteBuffer
-import java.text.SimpleDateFormat
-import java.util.Date
 import java.util.concurrent.Executors
-import java.util.concurrent.TimeUnit.NANOSECONDS
 
 import scala.concurrent.duration._
 import akka.actor._
-import akka.remote.{ RARP, RemoteActorRefProvider, RemotingMultiNodeSpec }
+import akka.remote.{ RemoteActorRefProvider, RemotingMultiNodeSpec }
 import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
 import akka.remote.testkit.PerfFlamesSupport
-import akka.remote.testkit.STMultiNodeSpec
-import akka.serialization.ByteBufferSerializer
-import akka.serialization.SerializerWithStringManifest
 import akka.testkit._
 import com.typesafe.config.ConfigFactory
-import akka.remote.artery.compress.CompressionProtocol.Events.ReceivedActorRefCompressionTable
 import akka.remote.artery.MaxThroughputSpec._
 
 object FanInThroughputSpec extends MultiNodeConfig {

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/FanOutThrougputSpec.scala

@@ -4,25 +4,16 @@
 
 package akka.remote.artery
 
-import java.nio.ByteBuffer
-import java.text.SimpleDateFormat
-import java.util.Date
 import java.util.concurrent.Executors
-import java.util.concurrent.TimeUnit.NANOSECONDS
 
 import scala.concurrent.duration._
 import akka.actor._
-import akka.remote.{ RARP, RemoteActorRefProvider, RemotingMultiNodeSpec }
+import akka.remote.{ RemoteActorRefProvider, RemotingMultiNodeSpec }
 import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
 import akka.remote.testkit.PerfFlamesSupport
-import akka.remote.testkit.STMultiNodeSpec
-import akka.serialization.ByteBufferSerializer
-import akka.serialization.SerializerWithStringManifest
 import akka.testkit._
 import com.typesafe.config.ConfigFactory
-import akka.remote.artery.compress.CompressionProtocol.Events.ReceivedActorRefCompressionTable
 import akka.remote.artery.MaxThroughputSpec._
 
 object FanOutThroughputSpec extends MultiNodeConfig {

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/HandshakeRestartReceiverSpec.scala

@@ -10,7 +10,6 @@ import scala.concurrent.duration._
 import akka.actor._
 import akka.remote.AddressUidExtension
 import akka.remote.RARP
-import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig
 import akka.remote.testkit.MultiNodeSpec
 import akka.remote.testkit.STMultiNodeSpec

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/LatencySpec.scala

@@ -5,7 +5,7 @@
 package akka.remote.artery
 
 import java.util.concurrent.Executors
-import java.util.concurrent.atomic.{ AtomicBoolean, AtomicLongArray }
+import java.util.concurrent.atomic.AtomicLongArray
 import java.util.concurrent.locks.LockSupport
 
 import scala.concurrent.duration._
@@ -13,8 +13,6 @@ import akka.actor._
 import akka.remote.RemotingMultiNodeSpec
 import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.stream.ActorMaterializer
 import akka.testkit._
 import com.typesafe.config.ConfigFactory

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/MaxThroughputSpec.scala

@@ -5,8 +5,6 @@
 package akka.remote.artery
 
 import java.nio.ByteBuffer
-import java.text.SimpleDateFormat
-import java.util.Date
 import java.util.concurrent.Executors
 import java.util.concurrent.TimeUnit.NANOSECONDS
 
@@ -15,9 +13,7 @@ import akka.actor._
 import akka.remote.{ RARP, RemoteActorRefProvider, RemotingMultiNodeSpec }
 import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
 import akka.remote.testkit.PerfFlamesSupport
-import akka.remote.testkit.STMultiNodeSpec
 import akka.serialization.ByteBufferSerializer
 import akka.serialization.SerializerWithStringManifest
 import akka.testkit._

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/SurviveInboundStreamRestartWithCompressionInFlightSpec.scala

@@ -4,22 +4,16 @@
 
 package akka.remote.artery
 
-import scala.concurrent.duration._
 import akka.actor._
 import akka.actor.ActorIdentity
 import akka.actor.Identify
-import akka.remote.{ QuarantinedEvent, RARP, RemotingMultiNodeSpec }
+import akka.remote.{ RARP, RemotingMultiNodeSpec }
-import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
-import akka.remote.transport.ThrottlerTransportAdapter.Direction
 import akka.testkit._
 import akka.util.Timeout
 import com.typesafe.config.ConfigFactory
 import org.scalatest.concurrent.ScalaFutures
 
-import scala.util.Try
 import scala.util.control.NoStackTrace
 
 object SurviveInboundStreamRestartWithCompressionInFlightSpec extends MultiNodeConfig {

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/SurviveNetworkPartitionSpec.scala

@@ -9,10 +9,7 @@ import akka.actor._
 import akka.actor.ActorIdentity
 import akka.actor.Identify
 import akka.remote.{ RemotingMultiNodeSpec, QuarantinedEvent, RARP }
-import akka.remote.testconductor.RoleName
 import akka.remote.testkit.MultiNodeConfig
-import akka.remote.testkit.MultiNodeSpec
-import akka.remote.testkit.STMultiNodeSpec
 import akka.remote.transport.ThrottlerTransportAdapter.Direction
 import akka.testkit._
 import com.typesafe.config.ConfigFactory

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/TestMessage.scala

@@ -6,10 +6,8 @@ package akka.remote.artery
 
 import akka.actor.ExtendedActorSystem
 import akka.serialization.SerializerWithStringManifest
-import akka.serialization.ByteBufferSerializer
 import akka.remote.artery.protobuf.{ TestMessages ⇒ proto }
 import akka.protobuf.ByteString
-import java.util.concurrent.locks.LockSupport
 
 object TestMessage {
   final case class Item(id: Long, name: String)

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/TestRateReporter.scala

@@ -5,7 +5,6 @@
 package akka.remote.artery
 
 import java.util.concurrent.TimeUnit.SECONDS
-import java.util.concurrent.Executors
 
 class TestRateReporter(name: String) extends RateReporter(
   SECONDS.toNanos(1),

akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/aeron/AeronStreamLatencySpec.scala

@@ -26,7 +26,6 @@ import akka.stream.ActorMaterializer
 import akka.stream.KillSwitches
 import akka.stream.ThrottleMode
 import akka.stream.scaladsl.Flow
-import akka.stream.scaladsl.Keep
 import akka.stream.scaladsl.Source
 import akka.testkit._
 import akka.util.ByteString

akka-remote-tests/src/multi-jvm/scala/akka/remote/routing/RemoteRandomSpec.scala

@@ -11,7 +11,7 @@ import akka.actor.Address
 import akka.actor.PoisonPill
 import akka.actor.Props
 import akka.remote.RemotingMultiNodeSpec
-import akka.remote.testkit.{ MultiNodeConfig, MultiNodeSpec, STMultiNodeSpec }
+import akka.remote.testkit.MultiNodeConfig
 import akka.routing.Broadcast
 import akka.routing.RandomPool
 import akka.routing.RoutedActorRef

akka-remote-tests/src/multi-jvm/scala/akka/remote/routing/RemoteScatterGatherSpec.scala

@@ -11,7 +11,7 @@ import akka.actor.Address
 import akka.actor.PoisonPill
 import akka.actor.Props
 import akka.remote.RemotingMultiNodeSpec
-import akka.remote.testkit.{ MultiNodeConfig, MultiNodeSpec, STMultiNodeSpec }
+import akka.remote.testkit.MultiNodeConfig
 import akka.routing.Broadcast
 import akka.routing.ScatterGatherFirstCompletedPool
 import akka.routing.RoutedActorRef

akka-remote-tests/src/multi-jvm/scala/akka/remote/testconductor/TestConductorSpec.scala

@@ -5,19 +5,13 @@
 package akka.remote.testconductor
 
 import language.postfixOps
-import com.typesafe.config.ConfigFactory
 import akka.actor.{ Actor, ActorIdentity, Deploy, Identify, Props }
 
-import scala.concurrent.Await
-import scala.concurrent.Awaitable
 import scala.concurrent.duration._
-import akka.testkit.ImplicitSender
 import akka.testkit.LongRunningTest
-import java.net.InetSocketAddress
-import java.net.InetAddress
 
 import akka.remote.RemotingMultiNodeSpec
-import akka.remote.testkit.{ MultiNodeConfig, MultiNodeSpec, STMultiNodeSpec }
+import akka.remote.testkit.MultiNodeConfig
 import akka.remote.transport.ThrottlerTransportAdapter.Direction
 
 object TestConductorMultiJvmSpec extends MultiNodeConfig {

akka-remote-tests/src/multi-jvm/scala/akka/remote/testkit/MultiNodeSpecSpec.scala

@@ -23,8 +23,6 @@ class MultiNodeSpecSpecMultiJvmNode4 extends MultiNodeSpecSpec
 
 class MultiNodeSpecSpec extends RemotingMultiNodeSpec(MultiNodeSpecMultiJvmSpec) {
 
-  import MultiNodeSpecMultiJvmSpec._
-
   def initialParticipants = 4
 
   "A MultiNodeSpec" must {