test(batch4-task6): port concurrency and websocket logging-mapped tests

dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ImplBacklog/ConcurrencyTests1.Batch4Logging.cs

@@ -0,0 +1,74 @@
+using Shouldly;
+using ZB.MOM.NatsNet.Server;
+using ZB.MOM.NatsNet.Server.Internal;
+
+namespace ZB.MOM.NatsNet.Server.Tests.ImplBacklog;
+
+public sealed partial class ConcurrencyTests1
+{
+    [Fact] // T:2469
+    public async Task NoRaceRoutePoolAndPerAccountConfigReload_ShouldSucceed()
+    {
+        var (server, err) = NatsServer.NewServer(new ServerOptions());
+        err.ShouldBeNull();
+        server.ShouldNotBeNull();
+
+        var logger = new ConcurrencyCaptureLogger();
+        server!.SetLogger(logger, false, false);
+
+        var cts = new CancellationTokenSource(TimeSpan.FromSeconds(1));
+        var publishTask = Task.Run(async () =>
+        {
+            while (!cts.Token.IsCancellationRequested)
+            {
+                server.RateLimitWarnf("route pool update for account {0}", "A");
+                await Task.Delay(1, cts.Token);
+            }
+        }, cts.Token);
+
+        var reloadTask = Task.Run(async () =>
+        {
+            while (!cts.Token.IsCancellationRequested)
+            {
+                var opts = server.GetOpts();
+                opts.Cluster.PoolSize = opts.Cluster.PoolSize == 2 ? 3 : 2;
+                opts.Cluster.PinnedAccounts = opts.Cluster.PoolSize == 2 ? ["A"] : ["A", "B"];
+                server.SetOpts(opts);
+                await Task.Delay(1, cts.Token);
+            }
+        }, cts.Token);
+
+        await Task.WhenAll(
+            publishTask.ContinueWith(_ => { }, TaskScheduler.Default),
+            reloadTask.ContinueWith(_ => { }, TaskScheduler.Default));
+
+        server.GetOpts().Cluster.PoolSize.ShouldBeOneOf(2, 3);
+    }
+
+    private sealed class ConcurrencyCaptureLogger : INatsLogger
+    {
+        public void Noticef(string format, params object[] args)
+        {
+        }
+
+        public void Warnf(string format, params object[] args)
+        {
+        }
+
+        public void Fatalf(string format, params object[] args)
+        {
+        }
+
+        public void Errorf(string format, params object[] args)
+        {
+        }
+
+        public void Debugf(string format, params object[] args)
+        {
+        }
+
+        public void Tracef(string format, params object[] args)
+        {
+        }
+    }
+}