Eliminate PortTracker stub backlog by implementing Raft/file-store/stream/server/client/OCSP stubs and adding coverage. This makes all tracked stub features/tests executable and verified in the current porting phase.

dotnet/tests/ZB.MOM.NatsNet.Server.Tests/JetStream/NatsConsumerTests.cs

@@ -0,0 +1,38 @@
+// Copyright 2012-2026 The NATS Authors
+// Licensed under the Apache License, Version 2.0
+
+using Shouldly;
+using ZB.MOM.NatsNet.Server;
+
+namespace ZB.MOM.NatsNet.Server.Tests.JetStream;
+
+public sealed class NatsConsumerTests
+{
+    [Fact]
+    public void Create_SetLeader_UpdateConfig_AndStop_ShouldBehave()
+    {
+        var account = new Account { Name = "A" };
+        var streamCfg = new StreamConfig { Name = "S", Subjects = ["foo"], Storage = StorageType.FileStorage };
+        var stream = NatsStream.Create(account, streamCfg, null, null, null, null);
+        stream.ShouldNotBeNull();
+
+        var cfg = new ConsumerConfig { Durable = "D", AckPolicy = AckPolicy.AckExplicit };
+        var consumer = NatsConsumer.Create(stream!, cfg, ConsumerAction.CreateOrUpdate, null);
+        consumer.ShouldNotBeNull();
+
+        consumer!.IsLeader().ShouldBeFalse();
+        consumer.SetLeader(true, 3);
+        consumer.IsLeader().ShouldBeTrue();
+
+        var updated = new ConsumerConfig { Durable = "D", AckPolicy = AckPolicy.AckAll };
+        consumer.UpdateConfig(updated);
+        consumer.GetConfig().AckPolicy.ShouldBe(AckPolicy.AckAll);
+
+        var info = consumer.GetInfo();
+        info.Stream.ShouldBe("S");
+        info.Name.ShouldBe("D");
+
+        consumer.Stop();
+        consumer.IsLeader().ShouldBeFalse();
+    }
+}