test(headless): cover K4 death and cancellation

tests/AcDream.Headless.Tests/HeadlessProcessSchedulerTests.cs

@@ -358,6 +358,76 @@ public sealed class HeadlessProcessSchedulerTests
             StringComparison.Ordinal);
     }
 
+    [Fact]
+    public async Task ThirtySessionsConvergeAcrossRandomizedCancellationEdges()
+    {
+        const int sessionCount = 30;
+        var random = new Random(0xAC2013);
+        for (int iteration = 0; iteration < 5; iteration++)
+        {
+            var configuration = new HeadlessConfiguration
+            {
+                Version = 1,
+                Sessions = Enumerable.Range(0, sessionCount)
+                    .Select(index => Descriptor(
+                        $"cancel-{iteration}-{index}",
+                        $"cancel-{iteration}-{index}-stdin"))
+                    .Cast<HeadlessSessionDescriptor?>()
+                    .ToList(),
+            };
+            var operations = new FixtureSessionOperations();
+            using var diagnostics = new StringWriter();
+            using var host = new HeadlessProcessHost(
+                configuration,
+                HeadlessPathSet.Resolve(
+                    new HeadlessPathOverrides()),
+                new System.IO.StringReader(string.Concat(
+                    Enumerable.Repeat(
+                        "random-cancel-password"
+                        + Environment.NewLine,
+                        sessionCount))),
+                diagnostics,
+                operations);
+            using var cancellation = new CancellationTokenSource(
+                TimeSpan.FromMilliseconds(random.Next(37, 144)));
+
+            HeadlessExitCode result =
+                await host.RunAsync(cancellation.Token);
+
+            Assert.True(cancellation.IsCancellationRequested);
+            Assert.Equal(HeadlessExitCode.Success, result);
+            Assert.Equal(sessionCount, operations.CreatedSessionCount);
+            Assert.All(
+                host.Sessions,
+                static session =>
+                    Assert.False(session.IsFaulted));
+
+            host.Dispose();
+
+            Assert.Equal(sessionCount, operations.DisposedSessionCount);
+            Assert.All(
+                host.Sessions,
+                static session =>
+                    Assert.True(
+                        session.Runtime
+                            .CaptureOwnership()
+                            .IsConverged));
+            string output = diagnostics.ToString();
+            Assert.Contains(
+                "\"state\":\"disposed\"",
+                output,
+                StringComparison.Ordinal);
+            Assert.Contains(
+                $"\"convergedRuntimeCount\":{sessionCount}",
+                output,
+                StringComparison.Ordinal);
+            Assert.DoesNotContain(
+                "random-cancel-password",
+                output,
+                StringComparison.Ordinal);
+        }
+    }
+
     [Fact]
     public void ThrowingPolicyQuarantinesOnlyItsOwnSession()
     {

tests/AcDream.Headless.Tests/HeadlessSessionIsolationTests.cs

@@ -151,6 +151,7 @@ public sealed class HeadlessSessionIsolationTests
             .Select(index => CreateHost(index, operations, time))
             .ToArray();
         var reconnectCounts = new int[sessionCount];
+        var deathCounts = new int[sessionCount];
         var random = new Random(0xAC2013);
         try
         {
@@ -197,6 +198,16 @@ public sealed class HeadlessSessionIsolationTests
                             2 + reconnectCounts[index]
                             + (frame / 211))));
                 }
+                if (frame % 5003 == 0)
+                {
+                    int index = (frame / 5003) % sessionCount;
+                    Death(
+                        operations.ActiveSession(
+                            hosts[index].SessionId),
+                        sharedPlayerGuid,
+                        frame);
+                    deathCounts[index]++;
+                }
                 if (frame % 353 == 0)
                 {
                     int index = random.Next(sessionCount);
@@ -289,12 +300,14 @@ public sealed class HeadlessSessionIsolationTests
             Assert.All(
                 reconnectCounts,
                 static count => Assert.True(count > 0));
+            Assert.All(
+                deathCounts,
+                static count => Assert.True(count > 0));
             var finalRecords = new List<RuntimeEntityRecord>(
                 sessionCount);
-            Assert.All(
-                hosts,
-                host =>
+            for (int index = 0; index < hosts.Length; index++)
             {
+                HeadlessSessionHost host = hosts[index];
                 Assert.Equal(
                     (ulong)frameCount,
                     host.Runtime.Clock.FrameNumber);
@@ -307,7 +320,10 @@ public sealed class HeadlessSessionIsolationTests
                     host.Runtime.TransitOwner
                         .CaptureOwnership()
                         .IsSessionIdle);
-                });
+                Assert.True(
+                    host.Runtime.CommunicationOwner.View.Count
+                    >= deathCounts[index]);
+            }
             Assert.Equal(
                 sessionCount,
                 finalRecords
@@ -420,6 +436,18 @@ public sealed class HeadlessSessionIsolationTests
                     ForcePositionSequence: 0));
     }
 
+    private static void Death(
+        WorldSession session,
+        uint victimGuid,
+        int sequence) =>
+        EventDelegate<Action<PlayerKilled.Parsed>>(
+            session,
+            nameof(session.PlayerKilledReceived))(
+                new PlayerKilled.Parsed(
+                    $"Headless death {sequence}.",
+                    victimGuid,
+                    0x5000FFFFu));
+
     private static WorldSession.EntitySpawn Spawn(
         uint guid,
         float positionX)