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/NatsStreamTests.cs

@@ -0,0 +1,43 @@
+// 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 NatsStreamTests
+{
+    [Fact]
+    public void Create_SetLeader_Purge_AndSeal_ShouldBehave()
+    {
+        var account = new Account { Name = "A" };
+        var streamCfg = new StreamConfig { Name = "ORDERS", Subjects = ["orders.*"], Storage = StorageType.FileStorage };
+
+        var memCfg = streamCfg.Clone();
+        memCfg.Storage = StorageType.MemoryStorage;
+        var store = new JetStreamMemStore(memCfg);
+        store.StoreMsg("orders.new", null, [1, 2], 0);
+
+        var stream = NatsStream.Create(account, streamCfg, null, store, null, null);
+        stream.ShouldNotBeNull();
+
+        stream!.IsLeader().ShouldBeFalse();
+        stream.SetLeader(true, 7);
+        stream.IsLeader().ShouldBeTrue();
+
+        stream.State().Msgs.ShouldBe(1UL);
+        stream.Purge();
+        stream.State().Msgs.ShouldBe(0UL);
+
+        stream.IsSealed().ShouldBeFalse();
+        stream.Seal();
+        stream.IsSealed().ShouldBeTrue();
+
+        stream.GetAccount().Name.ShouldBe("A");
+        stream.GetInfo().Config.Name.ShouldBe("ORDERS");
+
+        stream.Delete();
+        stream.IsLeader().ShouldBeFalse();
+    }
+}