chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/TestRunState.cs

@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Collections.Concurrent;
+using System.Threading;
+using Microsoft.Agents.AI.Workflows.Execution;
+
+namespace Microsoft.Agents.AI.Workflows.UnitTests;
+
+internal sealed class TestRunState
+{
+    public ConcurrentDictionary<string, ConcurrentQueue<object>> SentMessages = new();
+    public StateManager StateManager { get; } = new();
+    public ConcurrentQueue<WorkflowEvent> EmittedEvents { get; } = new();
+    public ConcurrentDictionary<string, ConcurrentQueue<object>> YieldedOutputs { get; } = new();
+
+    private int _haltRequests;
+    public int HaltRequests
+    {
+        get => Volatile.Read(ref this._haltRequests);
+    }
+
+    public void IncrementHaltRequests()
+    {
+        Interlocked.Increment(ref this._haltRequests);
+    }
+
+    public TestWorkflowContext ContextFor(string executorId) => new(executorId, this);
+}