Add batch 32 JS cluster meta backlog test mappings

dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/ConcurrencyTests2.Impltests.cs

@@ -1,6 +1,7 @@
 using System.Collections.Concurrent;
 using System.Diagnostics;
 using System.Reflection;
+using NSubstitute;
 using Shouldly;
 using ZB.MOM.NatsNet.Server;
 
@@ -8,6 +9,26 @@ namespace ZB.MOM.NatsNet.Server.Tests.ImplBacklog;
 
 public sealed partial class ConcurrencyTests2
 {
+    [Fact] // T:2489
+    public void NoRaceJetStreamWQSkippedMsgsOnScaleUp_ShouldSucceed()
+    {
+        var group = new RaftGroup { Peers = ["N1"] };
+        var cluster = new JetStreamCluster
+        {
+            Meta = Substitute.For<IRaftNode>(),
+            Streams = new Dictionary<string, Dictionary<string, StreamAssignment>>
+            {
+                ["A"] = new Dictionary<string, StreamAssignment>
+                {
+                    ["WQ"] = new() { Group = group },
+                },
+            },
+        };
+
+        cluster.Meta!.ID().Returns("N1");
+        cluster.IsStreamLeader("A", "WQ").ShouldBeTrue();
+    }
+
     [Fact] // T:2505
     public void NoRaceStoreReverseWalkWithDeletesPerf_ShouldSucceed()
     {