feat(batch15): complete group 4 msgblock/consumerfilestore

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

@@ -7,6 +7,46 @@ namespace ZB.MOM.NatsNet.Server.Tests.ImplBacklog;
 
 public sealed partial class ConcurrencyTests1
 {
+    [Fact] // T:2422
+    public void NoRaceJetStreamConsumerFileStoreConcurrentDiskIO_ShouldSucceed()
+    {
+        WithStore((fs, _) =>
+        {
+            const int consumerCount = 400;
+            var start = new ManualResetEventSlim(false);
+            var errors = new ConcurrentQueue<Exception>();
+            var timestamp = DateTimeOffset.UtcNow.ToUnixTimeSeconds() * 1_000_000_000L;
+
+            var workers = new List<Task>(consumerCount);
+            for (var i = 0; i < consumerCount; i++)
+            {
+                var consumer = fs.ConsumerStore(
+                    $"o{i}",
+                    DateTime.UtcNow,
+                    new ConsumerConfig { AckPolicy = AckPolicy.AckExplicit });
+
+                workers.Add(Task.Run(() =>
+                {
+                    try
+                    {
+                        start.Wait(TimeSpan.FromSeconds(5));
+                        consumer.UpdateDelivered(22, 22, 1, timestamp);
+                        consumer.EncodedState();
+                        consumer.Delete();
+                    }
+                    catch (Exception ex)
+                    {
+                        errors.Enqueue(ex);
+                    }
+                }));
+            }
+
+            start.Set();
+            Task.WaitAll(workers.ToArray());
+            errors.ShouldBeEmpty();
+        });
+    }
+
     [Fact] // T:2452
     public void NoRaceFileStoreStreamMaxAgePerformance_ShouldSucceed()
     {