Harden sender serialization specs (#87)

* cleanup solution items

* hardened serialization specs

* hardened end2end specs

src/Akka.Cluster.Chunking.Tests/ChunkingExtensionEnd2EndSpecs.cs

@@ -18,6 +18,7 @@ namespace Akka.Remote.Chunking.Tests;
 public class ChunkingExtensionEnd2EndSpecs : TestKit.Xunit2.TestKit
 {
     public static readonly Config ClusterConfig = ConfigurationFactory.ParseString(@"
+        akka.loglevel = DEBUG
         akka.actor.provider = cluster
         akka.remote.dot-netty.tcp.port = 0
         akka.remote.dot-netty.tcp.hostname = localhost
@@ -26,7 +27,8 @@ public class ChunkingExtensionEnd2EndSpecs : TestKit.Xunit2.TestKit
     public ChunkingExtensionEnd2EndSpecs(ITestOutputHelper output) : base(ClusterConfig, output: output)
     {
         Sys2 = ActorSystem.Create(Sys.Name, Sys.Settings.Config);
-        Settings = ChunkingManagerSettings.Create(Sys);
+        InitializeLogger(Sys2);
+        Settings = ChunkingManagerSettings.Create(Sys) with { ChunkSize = 1 };
     }
 
     public ActorSystem Sys2 { get; }

src/Akka.Cluster.Chunking.Tests/ChunkingSerializationSpecs.cs

@@ -22,7 +22,10 @@ public ChunkingSerializationSpecs(ITestOutputHelper output) : base(ChunkingConfi
     [Fact]
     public void ShouldSerializeChunkedDelivery()
     {
-        var msg = new ChunkedDelivery("hello", TestActor);
+        var probe = CreateTestProbe();
+
+        // make sure the IActorRefs are different
+        var msg = new ChunkedDelivery("hello", TestActor, probe);
         VerifySerialization(msg);
     }