Modernize sal-akka-raft tests
[controller.git] / opendaylight / md-sal / sal-akka-raft / src / test / java / org / opendaylight / controller / cluster / raft / RaftActorTest.java
index a810fe0a42524091d22bd95f06adb86336556a40..994d53128fad6abcb595f1a3735c3b907311c2b4 100644 (file)
@@ -5,19 +5,18 @@
  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
  * and is available at http://www.eclipse.org/legal/epl-v10.html
  */
-
 package org.opendaylight.controller.cluster.raft;
 
+import static org.awaitility.Awaitility.await;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNotSame;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
-import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.anyObject;
-import static org.mockito.Matchers.eq;
-import static org.mockito.Matchers.same;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.ArgumentMatchers.same;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
@@ -27,7 +26,6 @@ import static org.mockito.Mockito.verify;
 
 import akka.actor.ActorRef;
 import akka.actor.PoisonPill;
-import akka.actor.Props;
 import akka.actor.Status.Failure;
 import akka.actor.Terminated;
 import akka.dispatch.Dispatchers;
@@ -36,20 +34,18 @@ import akka.persistence.SaveSnapshotFailure;
 import akka.persistence.SaveSnapshotSuccess;
 import akka.persistence.SnapshotMetadata;
 import akka.persistence.SnapshotOffer;
-import akka.testkit.JavaTestKit;
+import akka.protobuf.ByteString;
 import akka.testkit.TestActorRef;
-import com.google.common.base.Optional;
-import com.google.common.collect.ImmutableMap;
+import akka.testkit.javadsl.TestKit;
 import com.google.common.util.concurrent.Uninterruptibles;
-import com.google.protobuf.ByteString;
 import java.io.ByteArrayOutputStream;
 import java.io.ObjectOutputStream;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.HashMap;
+import java.time.Duration;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import org.junit.After;
@@ -61,6 +57,8 @@ import org.opendaylight.controller.cluster.NonPersistentDataProvider;
 import org.opendaylight.controller.cluster.PersistentDataProvider;
 import org.opendaylight.controller.cluster.notifications.LeaderStateChanged;
 import org.opendaylight.controller.cluster.notifications.RoleChanged;
+import org.opendaylight.controller.cluster.raft.AbstractRaftActorIntegrationTest.TestPersist;
+import org.opendaylight.controller.cluster.raft.AbstractRaftActorIntegrationTest.TestRaftActor;
 import org.opendaylight.controller.cluster.raft.MockRaftActor.MockSnapshotState;
 import org.opendaylight.controller.cluster.raft.MockRaftActorContext.MockPayload;
 import org.opendaylight.controller.cluster.raft.base.messages.ApplySnapshot;
@@ -92,7 +90,6 @@ import org.opendaylight.controller.cluster.raft.utils.MessageCollectorActor;
 import org.opendaylight.yangtools.concepts.Identifier;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import scala.concurrent.duration.Duration;
 import scala.concurrent.duration.FiniteDuration;
 
 public class RaftActorTest extends AbstractActorTest {
@@ -107,7 +104,7 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @After
-    public void tearDown() throws Exception {
+    public void tearDown() {
         factory.close();
         InMemoryJournal.clear();
         InMemorySnapshotStore.clear();
@@ -126,10 +123,10 @@ public class RaftActorTest extends AbstractActorTest {
 
 
     @Test
-    public void testRaftActorRecoveryWithPersistenceEnabled() throws Exception {
+    public void testRaftActorRecoveryWithPersistenceEnabled() {
         TEST_LOG.info("testRaftActorRecoveryWithPersistenceEnabled starting");
 
-        JavaTestKit kit = new JavaTestKit(getSystem());
+        TestKit kit = new TestKit(getSystem());
         String persistenceId = factory.generateActorId("follower-");
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -139,22 +136,20 @@ public class RaftActorTest extends AbstractActorTest {
         // log entry.
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 
-        ImmutableMap<String, String> peerAddresses = ImmutableMap.<String, String>builder()
-                .put("member1", "address").build();
+        Map<String, String> peerAddresses = Map.of("member1", "address");
         ActorRef followerActor = factory.createActor(MockRaftActor.props(persistenceId,
                 peerAddresses, config), persistenceId);
 
         kit.watch(followerActor);
 
-        List<ReplicatedLogEntry> snapshotUnappliedEntries = new ArrayList<>();
-        ReplicatedLogEntry entry1 = new SimpleReplicatedLogEntry(4, 1, new MockRaftActorContext.MockPayload("E"));
-        snapshotUnappliedEntries.add(entry1);
+        List<ReplicatedLogEntry> snapshotUnappliedEntries = List.of(
+            new SimpleReplicatedLogEntry(4, 1, new MockRaftActorContext.MockPayload("E")));
 
         int lastAppliedDuringSnapshotCapture = 3;
         int lastIndexDuringSnapshotCapture = 4;
 
         // 4 messages as part of snapshot, which are applied to state
-        MockSnapshotState snapshotState = new MockSnapshotState(Arrays.asList(
+        MockSnapshotState snapshotState = new MockSnapshotState(List.of(
                 new MockRaftActorContext.MockPayload("A"),
                 new MockRaftActorContext.MockPayload("B"),
                 new MockRaftActorContext.MockPayload("C"),
@@ -165,13 +160,9 @@ public class RaftActorTest extends AbstractActorTest {
         InMemorySnapshotStore.addSnapshot(persistenceId, snapshot);
 
         // add more entries after snapshot is taken
-        List<ReplicatedLogEntry> entries = new ArrayList<>();
         ReplicatedLogEntry entry2 = new SimpleReplicatedLogEntry(5, 1, new MockRaftActorContext.MockPayload("F", 2));
         ReplicatedLogEntry entry3 = new SimpleReplicatedLogEntry(6, 1, new MockRaftActorContext.MockPayload("G", 3));
         ReplicatedLogEntry entry4 = new SimpleReplicatedLogEntry(7, 1, new MockRaftActorContext.MockPayload("H", 4));
-        entries.add(entry2);
-        entries.add(entry3);
-        entries.add(entry4);
 
         final int lastAppliedToState = 5;
         final int lastIndex = 7;
@@ -184,7 +175,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         // kill the actor
         followerActor.tell(PoisonPill.getInstance(), null);
-        kit.expectMsgClass(JavaTestKit.duration("5 seconds"), Terminated.class);
+        kit.expectMsgClass(Duration.ofSeconds(5), Terminated.class);
 
         kit.unwatch(followerActor);
 
@@ -197,7 +188,7 @@ public class RaftActorTest extends AbstractActorTest {
         mockRaftActor.waitForRecoveryComplete();
 
         RaftActorContext context = mockRaftActor.getRaftActorContext();
-        assertEquals("Journal log size", snapshotUnappliedEntries.size() + entries.size(),
+        assertEquals("Journal log size", snapshotUnappliedEntries.size() + 3,
                 context.getReplicatedLog().size());
         assertEquals("Journal data size", 10, context.getReplicatedLog().dataSize());
         assertEquals("Last index", lastIndex, context.getReplicatedLog().lastIndex());
@@ -213,7 +204,7 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testRaftActorRecoveryWithPersistenceDisabled() throws Exception {
+    public void testRaftActorRecoveryWithPersistenceDisabled() {
         String persistenceId = factory.generateActorId("follower-");
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -221,8 +212,7 @@ public class RaftActorTest extends AbstractActorTest {
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 
         TestActorRef<MockRaftActor> ref = factory.createTestActor(MockRaftActor.props(persistenceId,
-                ImmutableMap.<String, String>builder().put("member1", "address").build(),
-                config, createProvider()), persistenceId);
+                Map.of("member1", "address"), config, createProvider()), persistenceId);
 
         MockRaftActor mockRaftActor = ref.underlyingActor();
 
@@ -234,8 +224,8 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testUpdateElectionTermPersistedWithPersistenceDisabled() throws Exception {
-        final JavaTestKit kit = new JavaTestKit(getSystem());
+    public void testUpdateElectionTermPersistedWithPersistenceDisabled() {
+        final TestKit kit = new TestKit(getSystem());
         String persistenceId = factory.generateActorId("follower-");
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(100, TimeUnit.MILLISECONDS));
@@ -244,8 +234,7 @@ public class RaftActorTest extends AbstractActorTest {
         InMemoryJournal.addWriteMessagesCompleteLatch(persistenceId, 1);
 
         TestActorRef<MockRaftActor> ref = factory.createTestActor(MockRaftActor.props(persistenceId,
-                ImmutableMap.<String, String>builder().put("member1", "address").build(),
-                config, createProvider())
+                Map.of("member1", "address"), config, createProvider())
                 .withDispatcher(Dispatchers.DefaultDispatcherId()), persistenceId);
 
         InMemoryJournal.waitForWriteMessagesComplete(persistenceId);
@@ -256,8 +245,7 @@ public class RaftActorTest extends AbstractActorTest {
         factory.killActor(ref, kit);
 
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
-        ref = factory.createTestActor(MockRaftActor.props(persistenceId,
-                ImmutableMap.<String, String>builder().put("member1", "address").build(), config,
+        ref = factory.createTestActor(MockRaftActor.props(persistenceId, Map.of("member1", "address"), config,
                 createProvider()).withDispatcher(Dispatchers.DefaultDispatcherId()),
                 factory.generateActorId("follower-"));
 
@@ -282,7 +270,7 @@ public class RaftActorTest extends AbstractActorTest {
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
 
         TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
-                Collections.<String, String>emptyMap(), config), persistenceId);
+                Map.of(), config), persistenceId);
 
         MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 
@@ -293,7 +281,7 @@ public class RaftActorTest extends AbstractActorTest {
         mockRaftActor.setRaftActorRecoverySupport(mockSupport);
 
         Snapshot snapshot = Snapshot.create(ByteState.of(new byte[]{1}),
-                Collections.<ReplicatedLogEntry>emptyList(), 3, 1, 3, 1, -1, null, null);
+                List.of(), 3, 1, 3, 1, -1, null, null);
         SnapshotOffer snapshotOffer = new SnapshotOffer(new SnapshotMetadata("test", 6, 12345), snapshot);
         mockRaftActor.handleRecover(snapshotOffer);
 
@@ -334,12 +322,12 @@ public class RaftActorTest extends AbstractActorTest {
         // Wait for akka's recovery to complete so it doesn't interfere.
         mockRaftActor.waitForRecoveryComplete();
 
-        ApplySnapshot applySnapshot = new ApplySnapshot(mock(Snapshot.class));
+        ApplySnapshot applySnapshot = new ApplySnapshot(
+            Snapshot.create(null, null, 0, 0, 0, 0, 0, persistenceId, null));
         doReturn(true).when(mockSupport).handleSnapshotMessage(same(applySnapshot), any(ActorRef.class));
         mockRaftActor.handleCommand(applySnapshot);
 
-        CaptureSnapshotReply captureSnapshotReply = new CaptureSnapshotReply(ByteState.empty(),
-                java.util.Optional.empty());
+        CaptureSnapshotReply captureSnapshotReply = new CaptureSnapshotReply(ByteState.empty(), Optional.empty());
         doReturn(true).when(mockSupport).handleSnapshotMessage(same(captureSnapshotReply), any(ActorRef.class));
         mockRaftActor.handleCommand(captureSnapshotReply);
 
@@ -380,7 +368,7 @@ public class RaftActorTest extends AbstractActorTest {
         DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 
         TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
-                Collections.<String, String>emptyMap(), config, dataPersistenceProvider), persistenceId);
+                Map.of(), config, dataPersistenceProvider), persistenceId);
 
         MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 
@@ -388,13 +376,13 @@ public class RaftActorTest extends AbstractActorTest {
 
         mockRaftActor.waitUntilLeader();
 
-        mockRaftActor.onReceiveCommand(new ApplyJournalEntries(10));
+        mockRaftActor.handleCommand(new ApplyJournalEntries(10));
 
         verify(dataPersistenceProvider).persistAsync(any(ApplyJournalEntries.class), any(Procedure.class));
     }
 
     @Test
-    public void testApplyState() throws Exception {
+    public void testApplyState() {
         String persistenceId = factory.generateActorId("leader-");
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -404,7 +392,7 @@ public class RaftActorTest extends AbstractActorTest {
         DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 
         TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
-                Collections.<String, String>emptyMap(), config, dataPersistenceProvider), persistenceId);
+                Map.of(), config, dataPersistenceProvider), persistenceId);
 
         MockRaftActor mockRaftActor = mockActorRef.underlyingActor();
 
@@ -415,13 +403,12 @@ public class RaftActorTest extends AbstractActorTest {
         final Identifier id = new MockIdentifier("apply-state");
         mockRaftActor.getRaftActorContext().getApplyStateConsumer().accept(new ApplyState(mockActorRef, id, entry));
 
-        verify(mockRaftActor.actorDelegate).applyState(eq(mockActorRef), eq(id), anyObject());
+        verify(mockRaftActor.actorDelegate).applyState(eq(mockActorRef), eq(id), any());
     }
 
     @Test
     public void testRaftRoleChangeNotifierWhenRaftActorHasNoPeers() throws Exception {
-        TestActorRef<MessageCollectorActor> notifierActor = factory.createTestActor(
-                Props.create(MessageCollectorActor.class));
+        ActorRef notifierActor = factory.createActor(MessageCollectorActor.props());
         MessageCollectorActor.waitUntilReady(notifierActor);
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -463,7 +450,7 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(raftRoleChanged.getMemberId(), leaderStateChange.getLeaderId());
         assertEquals(MockRaftActor.PAYLOAD_VERSION, leaderStateChange.getLeaderPayloadVersion());
 
-        notifierActor.underlyingActor().clear();
+        MessageCollectorActor.clearMessages(notifierActor);
 
         MockRaftActor raftActor = raftActorRef.underlyingActor();
         final String newLeaderId = "new-leader";
@@ -487,7 +474,7 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(RaftState.Leader.name(), raftRoleChanged.getOldRole());
         assertEquals(RaftState.Follower.name(), raftRoleChanged.getNewRole());
 
-        notifierActor.underlyingActor().clear();
+        MessageCollectorActor.clearMessages(notifierActor);
 
         raftActor.handleCommand("any");
 
@@ -496,7 +483,7 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(newLeaderId, leaderStateChange.getLeaderId());
         assertEquals(newLeaderVersion, leaderStateChange.getLeaderPayloadVersion());
 
-        notifierActor.underlyingActor().clear();
+        MessageCollectorActor.clearMessages(notifierActor);
 
         raftActor.handleCommand("any");
 
@@ -507,7 +494,7 @@ public class RaftActorTest extends AbstractActorTest {
 
     @Test
     public void testRaftRoleChangeNotifierWhenRaftActorHasPeers() throws Exception {
-        ActorRef notifierActor = factory.createActor(Props.create(MessageCollectorActor.class));
+        ActorRef notifierActor = factory.createActor(MessageCollectorActor.props());
         MessageCollectorActor.waitUntilReady(notifierActor);
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -518,7 +505,7 @@ public class RaftActorTest extends AbstractActorTest {
         String persistenceId = factory.generateActorId("notifier-");
 
         factory.createActor(MockRaftActor.builder().id(persistenceId)
-                .peerAddresses(ImmutableMap.of("leader", "fake/path"))
+                .peerAddresses(Map.of("leader", "fake/path"))
                 .config(config).roleChangeNotifier(notifierActor).props());
 
         List<RoleChanged> matches =  null;
@@ -552,8 +539,7 @@ public class RaftActorTest extends AbstractActorTest {
         final String persistenceId = factory.generateActorId("leader-");
         final String follower1Id = factory.generateActorId("follower-");
 
-        ActorRef followerActor1 =
-                factory.createActor(Props.create(MessageCollectorActor.class));
+        ActorRef followerActor1 = factory.createActor(MessageCollectorActor.props());
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
@@ -561,8 +547,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 
-        Map<String, String> peerAddresses = new HashMap<>();
-        peerAddresses.put(follower1Id, followerActor1.path().toString());
+        Map<String, String> peerAddresses = Map.of(follower1Id, followerActor1.path().toString());
 
         TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(
                 MockRaftActor.props(persistenceId, peerAddresses, config, dataPersistenceProvider), persistenceId);
@@ -589,33 +574,33 @@ public class RaftActorTest extends AbstractActorTest {
         leaderActor.getRaftActorContext().getSnapshotManager().capture(
                 new SimpleReplicatedLogEntry(6, 1, new MockRaftActorContext.MockPayload("x")), 4);
 
-        verify(leaderActor.snapshotCohortDelegate).createSnapshot(anyObject(), anyObject());
+        verify(leaderActor.snapshotCohortDelegate).createSnapshot(any(), any());
 
         assertEquals(8, leaderActor.getReplicatedLog().size());
 
         assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
         //fake snapshot on index 5
-        leaderActor.onReceiveCommand(new AppendEntriesReply(follower1Id, 1, true, 5, 1, (short)0));
+        leaderActor.handleCommand(new AppendEntriesReply(follower1Id, 1, true, 5, 1, (short)0));
 
         assertEquals(8, leaderActor.getReplicatedLog().size());
 
         //fake snapshot on index 6
         assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
-        leaderActor.onReceiveCommand(new AppendEntriesReply(follower1Id, 1, true, 6, 1, (short)0));
+        leaderActor.handleCommand(new AppendEntriesReply(follower1Id, 1, true, 6, 1, (short)0));
         assertEquals(8, leaderActor.getReplicatedLog().size());
 
         assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
 
         assertEquals(8, leaderActor.getReplicatedLog().size());
 
-        MockSnapshotState snapshotState = new MockSnapshotState(Arrays.asList(
+        MockSnapshotState snapshotState = new MockSnapshotState(List.of(
                 new MockRaftActorContext.MockPayload("foo-0"),
                 new MockRaftActorContext.MockPayload("foo-1"),
                 new MockRaftActorContext.MockPayload("foo-2"),
                 new MockRaftActorContext.MockPayload("foo-3"),
                 new MockRaftActorContext.MockPayload("foo-4")));
 
-        leaderActor.getRaftActorContext().getSnapshotManager().persist(snapshotState, java.util.Optional.empty(),
+        leaderActor.getRaftActorContext().getSnapshotManager().persist(snapshotState, Optional.empty(),
                 Runtime.getRuntime().totalMemory());
 
         assertTrue(leaderActor.getRaftActorContext().getSnapshotManager().isCapturing());
@@ -632,7 +617,7 @@ public class RaftActorTest extends AbstractActorTest {
                 new SimpleReplicatedLogEntry(8, 1, new MockRaftActorContext.MockPayload("foo-8")));
 
         //fake snapshot on index 7, since lastApplied = 7 , we would keep the last applied
-        leaderActor.onReceiveCommand(new AppendEntriesReply(follower1Id, 1, true, 7, 1, (short)0));
+        leaderActor.handleCommand(new AppendEntriesReply(follower1Id, 1, true, 7, 1, (short)0));
         assertEquals(2, leaderActor.getReplicatedLog().size());
         assertEquals(8, leaderActor.getReplicatedLog().lastIndex());
     }
@@ -642,9 +627,7 @@ public class RaftActorTest extends AbstractActorTest {
         final String persistenceId = factory.generateActorId("follower-");
         final String leaderId = factory.generateActorId("leader-");
 
-
-        ActorRef leaderActor1 =
-                factory.createActor(Props.create(MessageCollectorActor.class));
+        ActorRef leaderActor1 = factory.createActor(MessageCollectorActor.props());
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
@@ -652,8 +635,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 
-        Map<String, String> peerAddresses = new HashMap<>();
-        peerAddresses.put(leaderId, leaderActor1.path().toString());
+        Map<String, String> peerAddresses = Map.of(leaderId, leaderActor1.path().toString());
 
         TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(
                 MockRaftActor.props(persistenceId, peerAddresses, config, dataPersistenceProvider), persistenceId);
@@ -681,35 +663,35 @@ public class RaftActorTest extends AbstractActorTest {
         followerActor.getRaftActorContext().getSnapshotManager().capture(
                 new SimpleReplicatedLogEntry(5, 1, new MockRaftActorContext.MockPayload("D")), 4);
 
-        verify(followerActor.snapshotCohortDelegate).createSnapshot(anyObject(), anyObject());
+        verify(followerActor.snapshotCohortDelegate).createSnapshot(any(), any());
 
         assertEquals(6, followerActor.getReplicatedLog().size());
 
         //fake snapshot on index 6
-        List<ReplicatedLogEntry> entries = Arrays.asList(
-                (ReplicatedLogEntry) new SimpleReplicatedLogEntry(6, 1, new MockRaftActorContext.MockPayload("foo-6")));
-        followerActor.onReceiveCommand(new AppendEntries(1, leaderId, 5, 1, entries, 5, 5, (short)0));
+        List<ReplicatedLogEntry> entries = List.of(
+                new SimpleReplicatedLogEntry(6, 1, new MockRaftActorContext.MockPayload("foo-6")));
+        followerActor.handleCommand(new AppendEntries(1, leaderId, 5, 1, entries, 5, 5, (short)0));
         assertEquals(7, followerActor.getReplicatedLog().size());
 
         //fake snapshot on index 7
         assertEquals(RaftState.Follower, followerActor.getCurrentBehavior().state());
 
-        entries = Arrays.asList((ReplicatedLogEntry) new SimpleReplicatedLogEntry(7, 1,
+        entries = List.of(new SimpleReplicatedLogEntry(7, 1,
                 new MockRaftActorContext.MockPayload("foo-7")));
-        followerActor.onReceiveCommand(new AppendEntries(1, leaderId, 6, 1, entries, 6, 6, (short) 0));
+        followerActor.handleCommand(new AppendEntries(1, leaderId, 6, 1, entries, 6, 6, (short) 0));
         assertEquals(8, followerActor.getReplicatedLog().size());
 
         assertEquals(RaftState.Follower, followerActor.getCurrentBehavior().state());
 
 
-        ByteString snapshotBytes = fromObject(Arrays.asList(
+        ByteString snapshotBytes = fromObject(List.of(
                 new MockRaftActorContext.MockPayload("foo-0"),
                 new MockRaftActorContext.MockPayload("foo-1"),
                 new MockRaftActorContext.MockPayload("foo-2"),
                 new MockRaftActorContext.MockPayload("foo-3"),
                 new MockRaftActorContext.MockPayload("foo-4")));
-        followerActor.onReceiveCommand(new CaptureSnapshotReply(ByteState.of(snapshotBytes.toByteArray()),
-                java.util.Optional.empty()));
+        followerActor.handleCommand(new CaptureSnapshotReply(ByteState.of(snapshotBytes.toByteArray()),
+                Optional.empty()));
         assertTrue(followerActor.getRaftActorContext().getSnapshotManager().isCapturing());
 
         // The commit is needed to complete the snapshot creation process
@@ -719,10 +701,9 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(3, followerActor.getReplicatedLog().size()); //indexes 5,6,7 left in the log
         assertEquals(7, followerActor.getReplicatedLog().lastIndex());
 
-        entries = Arrays.asList((ReplicatedLogEntry) new SimpleReplicatedLogEntry(8, 1,
-                new MockRaftActorContext.MockPayload("foo-7")));
+        entries = List.of(new SimpleReplicatedLogEntry(8, 1, new MockRaftActorContext.MockPayload("foo-7")));
         // send an additional entry 8 with leaderCommit = 7
-        followerActor.onReceiveCommand(new AppendEntries(1, leaderId, 7, 1, entries, 7, 7, (short) 0));
+        followerActor.handleCommand(new AppendEntries(1, leaderId, 7, 1, entries, 7, 7, (short) 0));
 
         // 7 and 8, as lastapplied is 7
         assertEquals(2, followerActor.getReplicatedLog().size());
@@ -734,8 +715,8 @@ public class RaftActorTest extends AbstractActorTest {
         final String follower1Id = factory.generateActorId("follower-");
         final String follower2Id = factory.generateActorId("follower-");
 
-        final ActorRef followerActor1 = factory.createActor(Props.create(MessageCollectorActor.class), follower1Id);
-        final ActorRef followerActor2 = factory.createActor(Props.create(MessageCollectorActor.class), follower2Id);
+        final ActorRef followerActor1 = factory.createActor(MessageCollectorActor.props(), follower1Id);
+        final ActorRef followerActor2 = factory.createActor(MessageCollectorActor.props(), follower2Id);
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
@@ -743,9 +724,9 @@ public class RaftActorTest extends AbstractActorTest {
 
         DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 
-        Map<String, String> peerAddresses = new HashMap<>();
-        peerAddresses.put(follower1Id, followerActor1.path().toString());
-        peerAddresses.put(follower2Id, followerActor2.path().toString());
+        Map<String, String> peerAddresses = Map.of(
+            follower1Id, followerActor1.path().toString(),
+            follower2Id, followerActor2.path().toString());
 
         TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(
                 MockRaftActor.props(persistenceId, peerAddresses, config, dataPersistenceProvider), persistenceId);
@@ -772,17 +753,17 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals(5, leaderActor.getReplicatedLog().size());
         assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
 
-        leaderActor.onReceiveCommand(new AppendEntriesReply(follower1Id, 1, true, 9, 1, (short) 0));
+        leaderActor.handleCommand(new AppendEntriesReply(follower1Id, 1, true, 9, 1, (short) 0));
         assertEquals(5, leaderActor.getReplicatedLog().size());
         assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
 
         // set the 2nd follower nextIndex to 1 which has been snapshotted
-        leaderActor.onReceiveCommand(new AppendEntriesReply(follower2Id, 1, true, 0, 1, (short)0));
+        leaderActor.handleCommand(new AppendEntriesReply(follower2Id, 1, true, 0, 1, (short)0));
         assertEquals(5, leaderActor.getReplicatedLog().size());
         assertEquals(RaftState.Leader, leaderActor.getCurrentBehavior().state());
 
         // simulate a real snapshot
-        leaderActor.onReceiveCommand(SendHeartBeat.INSTANCE);
+        leaderActor.handleCommand(SendHeartBeat.INSTANCE);
         assertEquals(5, leaderActor.getReplicatedLog().size());
         assertEquals(String.format("expected to be Leader but was %s. Current Leader = %s ",
                 leaderActor.getCurrentBehavior().state(), leaderActor.getLeaderId()),
@@ -790,25 +771,25 @@ public class RaftActorTest extends AbstractActorTest {
 
 
         //reply from a slow follower does not initiate a fake snapshot
-        leaderActor.onReceiveCommand(new AppendEntriesReply(follower2Id, 1, true, 9, 1, (short)0));
+        leaderActor.handleCommand(new AppendEntriesReply(follower2Id, 1, true, 9, 1, (short)0));
         assertEquals("Fake snapshot should not happen when Initiate is in progress", 5,
                 leaderActor.getReplicatedLog().size());
 
-        ByteString snapshotBytes = fromObject(Arrays.asList(
+        ByteString snapshotBytes = fromObject(List.of(
                 new MockRaftActorContext.MockPayload("foo-0"),
                 new MockRaftActorContext.MockPayload("foo-1"),
                 new MockRaftActorContext.MockPayload("foo-2"),
                 new MockRaftActorContext.MockPayload("foo-3"),
                 new MockRaftActorContext.MockPayload("foo-4")));
-        leaderActor.onReceiveCommand(new CaptureSnapshotReply(ByteState.of(snapshotBytes.toByteArray()),
-                java.util.Optional.empty()));
+        leaderActor.handleCommand(new CaptureSnapshotReply(ByteState.of(snapshotBytes.toByteArray()),
+                Optional.empty()));
         assertTrue(leaderActor.getRaftActorContext().getSnapshotManager().isCapturing());
 
         assertEquals("Real snapshot didn't clear the log till replicatedToAllIndex", 0,
                 leaderActor.getReplicatedLog().size());
 
         //reply from a slow follower after should not raise errors
-        leaderActor.onReceiveCommand(new AppendEntriesReply(follower2Id, 1, true, 5, 1, (short) 0));
+        leaderActor.handleCommand(new AppendEntriesReply(follower2Id, 1, true, 5, 1, (short) 0));
         assertEquals(0, leaderActor.getReplicatedLog().size());
     }
 
@@ -822,7 +803,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         DataPersistenceProvider dataPersistenceProvider = createProvider();
 
-        Map<String, String> peerAddresses = ImmutableMap.<String, String>builder().put("member1", "address").build();
+        Map<String, String> peerAddresses = Map.of("member1", "address");
 
         TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(
                 MockRaftActor.props(persistenceId, peerAddresses, config, dataPersistenceProvider), persistenceId);
@@ -848,7 +829,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         // Now send a CaptureSnapshotReply
         mockActorRef.tell(new CaptureSnapshotReply(ByteState.of(fromObject("foo").toByteArray()),
-                java.util.Optional.empty()), mockActorRef);
+                Optional.empty()), mockActorRef);
 
         // Trimming log in this scenario is a no-op
         assertEquals(-1, leaderActor.getReplicatedLog().getSnapshotIndex());
@@ -866,7 +847,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         DataPersistenceProvider dataPersistenceProvider = createProvider();
 
-        Map<String, String> peerAddresses = ImmutableMap.<String, String>builder().put("member1", "address").build();
+        Map<String, String> peerAddresses = Map.of("member1", "address");
 
         TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(
                 MockRaftActor.props(persistenceId, peerAddresses, config, dataPersistenceProvider), persistenceId);
@@ -889,7 +870,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         // Now send a CaptureSnapshotReply
         mockActorRef.tell(new CaptureSnapshotReply(ByteState.of(fromObject("foo").toByteArray()),
-                java.util.Optional.empty()), mockActorRef);
+                Optional.empty()), mockActorRef);
 
         // Trimming log in this scenario is a no-op
         assertEquals(3, leaderActor.getReplicatedLog().getSnapshotIndex());
@@ -912,7 +893,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         DataPersistenceProvider dataPersistenceProvider = createProvider();
 
-        Map<String, String> peerAddresses = ImmutableMap.<String, String>builder().build();
+        Map<String, String> peerAddresses = Map.of();
 
         TestActorRef<MockRaftActor> mockActorRef = factory.createTestActor(
                 MockRaftActor.props(persistenceId, peerAddresses, config, dataPersistenceProvider), persistenceId);
@@ -963,11 +944,10 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testUpdateConfigParam() throws Exception {
+    public void testUpdateConfigParam() {
         DefaultConfigParamsImpl emptyConfig = new DefaultConfigParamsImpl();
         String persistenceId = factory.generateActorId("follower-");
-        ImmutableMap<String, String> peerAddresses =
-            ImmutableMap.<String, String>builder().put("member1", "address").build();
+        Map<String, String> peerAddresses = Map.of("member1", "address");
         DataPersistenceProvider dataPersistenceProvider = mock(DataPersistenceProvider.class);
 
         TestActorRef<MockRaftActor> actorRef = factory.createTestActor(
@@ -1011,10 +991,10 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testGetSnapshot() throws Exception {
+    public void testGetSnapshot() {
         TEST_LOG.info("testGetSnapshot starting");
 
-        final JavaTestKit kit = new JavaTestKit(getSystem());
+        final TestKit kit = new TestKit(getSystem());
 
         String persistenceId = factory.generateActorId("test-actor-");
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -1032,7 +1012,7 @@ public class RaftActorTest extends AbstractActorTest {
                 new MockRaftActorContext.MockPayload("C")));
 
         TestActorRef<MockRaftActor> raftActorRef = factory.createTestActor(MockRaftActor.props(persistenceId,
-                ImmutableMap.<String, String>builder().put("member1", "address").build(), config)
+                Map.of("member1", "address"), config)
                     .withDispatcher(Dispatchers.DefaultDispatcherId()), persistenceId);
         MockRaftActor mockRaftActor = raftActorRef.underlyingActor();
 
@@ -1044,10 +1024,10 @@ public class RaftActorTest extends AbstractActorTest {
 
         ArgumentCaptor<ActorRef> replyActor = ArgumentCaptor.forClass(ActorRef.class);
         verify(mockRaftActor.snapshotCohortDelegate, timeout(5000)).createSnapshot(replyActor.capture(),
-                eq(java.util.Optional.empty()));
+                eq(Optional.empty()));
 
         byte[] stateSnapshot = new byte[]{1,2,3};
-        replyActor.getValue().tell(new CaptureSnapshotReply(ByteState.of(stateSnapshot), java.util.Optional.empty()),
+        replyActor.getValue().tell(new CaptureSnapshotReply(ByteState.of(stateSnapshot), Optional.empty()),
                 ActorRef.noSender());
 
         GetSnapshotReply reply = kit.expectMsgClass(GetSnapshotReply.class);
@@ -1067,14 +1047,15 @@ public class RaftActorTest extends AbstractActorTest {
         // Test with timeout
 
         mockRaftActor.getSnapshotMessageSupport().setSnapshotReplyActorTimeout(
-                Duration.create(200, TimeUnit.MILLISECONDS));
+            FiniteDuration.create(200, TimeUnit.MILLISECONDS));
         reset(mockRaftActor.snapshotCohortDelegate);
 
         raftActorRef.tell(GetSnapshot.INSTANCE, kit.getRef());
         Failure failure = kit.expectMsgClass(akka.actor.Status.Failure.class);
         assertEquals("Failure cause type", TimeoutException.class, failure.cause().getClass());
 
-        mockRaftActor.getSnapshotMessageSupport().setSnapshotReplyActorTimeout(Duration.create(30, TimeUnit.SECONDS));
+        mockRaftActor.getSnapshotMessageSupport().setSnapshotReplyActorTimeout(
+            FiniteDuration.create(30, TimeUnit.SECONDS));
 
         // Test with persistence disabled.
 
@@ -1083,7 +1064,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         raftActorRef.tell(GetSnapshot.INSTANCE, kit.getRef());
         reply = kit.expectMsgClass(GetSnapshotReply.class);
-        verify(mockRaftActor.snapshotCohortDelegate, never()).createSnapshot(anyObject(), anyObject());
+        verify(mockRaftActor.snapshotCohortDelegate, never()).createSnapshot(any(), any());
 
         assertEquals("getId", persistenceId, reply.getId());
         replySnapshot = reply.getSnapshot();
@@ -1100,20 +1081,20 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testRestoreFromSnapshot() throws Exception {
+    public void testRestoreFromSnapshot() {
         TEST_LOG.info("testRestoreFromSnapshot starting");
 
         String persistenceId = factory.generateActorId("test-actor-");
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 
-        List<ReplicatedLogEntry> snapshotUnappliedEntries = new ArrayList<>();
-        snapshotUnappliedEntries.add(new SimpleReplicatedLogEntry(4, 1, new MockRaftActorContext.MockPayload("E")));
+        List<ReplicatedLogEntry> snapshotUnappliedEntries = List.of(
+            new SimpleReplicatedLogEntry(4, 1, new MockRaftActorContext.MockPayload("E")));
 
         int snapshotLastApplied = 3;
         int snapshotLastIndex = 4;
 
-        MockSnapshotState snapshotState = new MockSnapshotState(Arrays.asList(
+        MockSnapshotState snapshotState = new MockSnapshotState(List.of(
                 new MockRaftActorContext.MockPayload("A"),
                 new MockRaftActorContext.MockPayload("B"),
                 new MockRaftActorContext.MockPayload("C"),
@@ -1154,7 +1135,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         // Test with data persistence disabled
 
-        snapshot = Snapshot.create(EmptyState.INSTANCE, Collections.<ReplicatedLogEntry>emptyList(),
+        snapshot = Snapshot.create(EmptyState.INSTANCE, List.of(),
                 -1, -1, -1, -1, 5, "member-1", null);
 
         persistenceId = factory.generateActorId("test-actor-");
@@ -1184,9 +1165,9 @@ public class RaftActorTest extends AbstractActorTest {
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
 
-        List<MockPayload> state = Arrays.asList(new MockRaftActorContext.MockPayload("A"));
+        List<MockPayload> state = List.of(new MockRaftActorContext.MockPayload("A"));
         Snapshot snapshot = Snapshot.create(ByteState.of(fromObject(state).toByteArray()),
-                Arrays.<ReplicatedLogEntry>asList(), 5, 2, 5, 2, 2, "member-1", null);
+                List.of(), 5, 2, 5, 2, 2, "member-1", null);
 
         InMemoryJournal.addEntry(persistenceId, 1, new SimpleReplicatedLogEntry(0, 1,
                 new MockRaftActorContext.MockPayload("B")));
@@ -1213,7 +1194,7 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testNonVotingOnRecovery() throws Exception {
+    public void testNonVotingOnRecovery() {
         TEST_LOG.info("testNonVotingOnRecovery starting");
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
@@ -1222,7 +1203,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         String persistenceId = factory.generateActorId("test-actor-");
         InMemoryJournal.addEntry(persistenceId, 1,  new SimpleReplicatedLogEntry(0, 1,
-                new ServerConfigurationPayload(Arrays.asList(new ServerInfo(persistenceId, false)))));
+                new ServerConfigurationPayload(List.of(new ServerInfo(persistenceId, false)))));
 
         TestActorRef<MockRaftActor> raftActorRef = factory.createTestActor(MockRaftActor.builder().id(persistenceId)
                 .config(config).props().withDispatcher(Dispatchers.DefaultDispatcherId()), persistenceId);
@@ -1239,11 +1220,10 @@ public class RaftActorTest extends AbstractActorTest {
     }
 
     @Test
-    public void testLeaderTransitioning() throws Exception {
+    public void testLeaderTransitioning() {
         TEST_LOG.info("testLeaderTransitioning starting");
 
-        TestActorRef<MessageCollectorActor> notifierActor = factory.createTestActor(
-                Props.create(MessageCollectorActor.class));
+        ActorRef notifierActor = factory.createActor(MessageCollectorActor.props());
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
@@ -1257,7 +1237,7 @@ public class RaftActorTest extends AbstractActorTest {
 
         mockRaftActor.waitForInitializeBehaviorComplete();
 
-        raftActorRef.tell(new AppendEntries(1L, "leader", 0L, 1L, Collections.<ReplicatedLogEntry>emptyList(),
+        raftActorRef.tell(new AppendEntries(1L, "leader", 0L, 1L, List.of(),
                 0L, -1L, (short)1), ActorRef.noSender());
         LeaderStateChanged leaderStateChange = MessageCollectorActor.expectFirstMatching(
                 notifierActor, LeaderStateChanged.class);
@@ -1280,7 +1260,7 @@ public class RaftActorTest extends AbstractActorTest {
         final String leaderId = factory.generateActorId("leader-");
         final String followerId = factory.generateActorId("follower-");
 
-        final ActorRef followerActor = factory.createActor(Props.create(MessageCollectorActor.class));
+        final ActorRef followerActor = factory.createActor(MessageCollectorActor.props());
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
@@ -1290,7 +1270,7 @@ public class RaftActorTest extends AbstractActorTest {
         doReturn(true).when(mockPersistenceProvider).isRecoveryApplicable();
 
         TestActorRef<MockRaftActor> leaderActorRef = factory.createTestActor(
-                MockRaftActor.props(leaderId, ImmutableMap.of(followerId, followerActor.path().toString()), config,
+                MockRaftActor.props(leaderId, Map.of(followerId, followerActor.path().toString()), config,
                         mockPersistenceProvider), leaderId);
         MockRaftActor leaderActor = leaderActorRef.underlyingActor();
         leaderActor.waitForInitializeBehaviorComplete();
@@ -1308,7 +1288,7 @@ public class RaftActorTest extends AbstractActorTest {
         assertEquals("isPersistencePending", true, logEntry.isPersistencePending());
         assertEquals("getCommitIndex", -1, leaderActor.getRaftActorContext().getCommitIndex());
 
-        leaderActor.onReceiveCommand(new AppendEntriesReply(followerId, 1, true, 0, 1, (short)0));
+        leaderActor.handleCommand(new AppendEntriesReply(followerId, 1, true, 0, 1, (short)0));
         assertEquals("getCommitIndex", -1, leaderActor.getRaftActorContext().getCommitIndex());
 
         ArgumentCaptor<Procedure> callbackCaptor = ArgumentCaptor.forClass(Procedure.class);
@@ -1325,14 +1305,14 @@ public class RaftActorTest extends AbstractActorTest {
         final String leaderId = factory.generateActorId("leader-");
         final String followerId = factory.generateActorId("follower-");
 
-        final ActorRef followerActor = factory.createActor(Props.create(MessageCollectorActor.class));
+        final ActorRef followerActor = factory.createActor(MessageCollectorActor.props());
 
         DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
         config.setHeartBeatInterval(new FiniteDuration(1, TimeUnit.DAYS));
         config.setIsolatedLeaderCheckInterval(new FiniteDuration(1, TimeUnit.DAYS));
 
         TestActorRef<MockRaftActor> leaderActorRef = factory.createTestActor(
-                MockRaftActor.props(leaderId, ImmutableMap.of(followerId, followerActor.path().toString()), config),
+                MockRaftActor.props(leaderId, Map.of(followerId, followerActor.path().toString()), config),
                     leaderId);
         MockRaftActor leaderActor = leaderActorRef.underlyingActor();
         leaderActor.waitForInitializeBehaviorComplete();
@@ -1345,7 +1325,7 @@ public class RaftActorTest extends AbstractActorTest {
         MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
         MessageCollectorActor.clearMessages(followerActor);
 
-        leaderActor.onReceiveCommand(new AppendEntriesReply(followerId, 1, true, -1, -1, (short)0));
+        leaderActor.handleCommand(new AppendEntriesReply(followerId, 1, true, -1, -1, (short)0));
 
         leaderActor.persistData(leaderActorRef, new MockIdentifier("1"), new MockPayload("1"), true);
         MessageCollectorActor.assertNoneMatching(followerActor, AppendEntries.class, 500);
@@ -1357,4 +1337,67 @@ public class RaftActorTest extends AbstractActorTest {
         AppendEntries appendEntries = MessageCollectorActor.expectFirstMatching(followerActor, AppendEntries.class);
         assertEquals("AppendEntries size", 3, appendEntries.getEntries().size());
     }
+
+    @Test
+    @SuppressWarnings("checkstyle:illegalcatch")
+    public void testApplyStateRace() throws Exception {
+        final String leaderId = factory.generateActorId("leader-");
+        final String followerId = factory.generateActorId("follower-");
+
+        DefaultConfigParamsImpl config = new DefaultConfigParamsImpl();
+        config.setIsolatedLeaderCheckInterval(new FiniteDuration(1, TimeUnit.DAYS));
+        config.setCustomRaftPolicyImplementationClass(DisableElectionsRaftPolicy.class.getName());
+
+        ActorRef mockFollowerActorRef = factory.createActor(MessageCollectorActor.props());
+
+        TestRaftActor.Builder builder = TestRaftActor.newBuilder()
+                .id(leaderId)
+                .peerAddresses(Map.of(followerId, mockFollowerActorRef.path().toString()))
+                .config(config)
+                .collectorActor(factory.createActor(
+                        MessageCollectorActor.props(), factory.generateActorId(leaderId + "-collector")));
+
+        TestActorRef<MockRaftActor> leaderActorRef = factory.createTestActor(
+                builder.props(), leaderId);
+        MockRaftActor leaderActor = leaderActorRef.underlyingActor();
+        leaderActor.waitForInitializeBehaviorComplete();
+
+        leaderActor.getRaftActorContext().getTermInformation().update(1, leaderId);
+        Leader leader = new Leader(leaderActor.getRaftActorContext());
+        leaderActor.setCurrentBehavior(leader);
+
+        final ExecutorService executorService = Executors.newSingleThreadExecutor();
+
+        leaderActor.setPersistence(new PersistentDataProvider(leaderActor) {
+            @Override
+            public <T> void persistAsync(final T entry, final Procedure<T> procedure) {
+                // needs to be executed from another thread to simulate the persistence actor calling this callback
+                executorService.submit(() -> {
+                    try {
+                        procedure.apply(entry);
+                    } catch (Exception e) {
+                        TEST_LOG.info("Fail during async persist callback", e);
+                    }
+                }, "persistence-callback");
+            }
+        });
+
+        leader.getFollower(followerId).setNextIndex(0);
+        leader.getFollower(followerId).setMatchIndex(-1);
+
+        // hitting this is flimsy so run multiple times to improve the chance of things
+        // blowing up while breaking actor containment
+        final TestPersist message =
+                new TestPersist(leaderActorRef, new MockIdentifier("1"), new MockPayload("1"));
+        for (int i = 0; i < 100; i++) {
+            leaderActorRef.tell(message, null);
+
+            AppendEntriesReply reply =
+                    new AppendEntriesReply(followerId, 1, true, i, 1, (short) 5);
+            leaderActorRef.tell(reply, mockFollowerActorRef);
+        }
+
+        await("Persistence callback.").atMost(5, TimeUnit.SECONDS).until(() -> leaderActor.getState().size() == 100);
+        executorService.shutdown();
+    }
 }