Issue akkadotnet#6948 unit test

Author: Arkatufus

src/core/Akka.Tests/Actor/BugFix6948Spec.cs

@@ -0,0 +1,91 @@
+//-----------------------------------------------------------------------
+// <copyright file="BugFix6948Spec.cs" company="Akka.NET Project">
+//     Copyright (C) 2009-2023 Lightbend Inc. <http://www.lightbend.com>
+//     Copyright (C) 2013-2023 .NET Foundation <https://github.com/akkadotnet/akka.net>
+// </copyright>
+//-----------------------------------------------------------------------
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Akka.Actor;
+using Akka.Event;
+using Akka.TestKit;
+using FluentAssertions;
+using FluentAssertions.Extensions;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace Akka.Tests.Actor;
+
+public class BugFix6948Spec : AkkaSpec
+{
+    public BugFix6948Spec(ITestOutputHelper output): base("akka.loglevel=DEBUG", output)
+    {
+    }
+
+    [Fact(DisplayName = "#6948 ActorSystem should terminate cleanly on fatal exceptions")]
+    public async Task ActorSystem_ShouldTerminateCleanlyOnOOM()
+    {
+        var actor = Sys.ActorOf(Props.Create(() => new OutOfMemoryActor()));
+        actor.Tell("die");
+        ExpectMsg("dead");
+        
+        var shutdown = CoordinatedShutdown.Get(Sys);
+        shutdown.AddTask(CoordinatedShutdown.PhaseBeforeActorSystemTerminate, "z", () =>
+        {
+            var pressure = new List<long>();
+            try
+            {
+                foreach (var i in Enumerable.Range(0, 50_000_000))
+                {
+                    pressure.Add(i);
+                }
+            }
+            catch (OutOfMemoryException ex)
+            {
+                Log.Error(ex, "I died (CoordinatedShutdown)");
+                throw;
+            }
+
+            return Task.FromResult(Done.Instance);
+        });
+
+        var terminated = false;
+        Sys.RegisterOnTermination(() =>
+        {
+            terminated = true;
+        });
+        
+        await shutdown.Run(CoordinatedShutdown.UnknownReason.Instance);
+        await Sys.Terminate().WaitAsync(5.Seconds());
+        terminated.Should().BeTrue();
+    }
+
+    private class OutOfMemoryActor : ReceiveActor
+    {
+        private readonly List<long> _memoryPressure = new ();
+        
+        public OutOfMemoryActor()
+        {
+            var log = Context.GetLogger();
+            
+            Receive<string>(_ =>
+            {
+                try
+                {
+                    foreach (var i in Enumerable.Range(0, 50_000_000))
+                    {
+                        _memoryPressure.Add(i);
+                    }
+                }
+                catch (OutOfMemoryException e)
+                {
+                    log.Error(e, "I died (Actor)");
+                    Sender.Tell("dead");
+                }
+            });
+        }
+    }
+}

src/core/Akka.Tests/Akka.Tests.csproj

@@ -5,6 +5,7 @@
     <AssemblyTitle>Akka.Tests</AssemblyTitle>
     <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT' ">$(NetFrameworkTestVersion);$(NetTestVersion)</TargetFrameworks>
     <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">$(NetTestVersion)</TargetFrameworks>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
 
   <ItemGroup>