Add batch 32 JS cluster meta backlog test mappings

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

@@ -6,6 +6,23 @@ namespace ZB.MOM.NatsNet.Server.Tests.ImplBacklog;
 
 public sealed class JetStreamClusterLongTests
 {
+    [Fact] // T:1217
+    public void LongClusterCLFSOnDuplicates_ShouldSucceed()
+    {
+        var updates = new RecoveryUpdates();
+        var stream = new StreamAssignment
+        {
+            Client = new ClientInfo { Account = "A" },
+            Config = new StreamConfig { Name = "DUPES" },
+        };
+
+        for (var i = 0; i < 3; i++)
+            updates.AddStream(stream);
+
+        updates.AddStreams.Count.ShouldBe(1);
+        updates.AddStreams.ShouldContainKey("A:DUPES");
+    }
+
     [Fact] // T:1219
     public void LongFileStoreEnforceMsgPerSubjectLimit_ShouldSucceed()
     {