chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.Valkey.UnitTests/TestHelpers.cs

@@ -0,0 +1,44 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.AI;
+using Moq;
+
+namespace Microsoft.Agents.AI.Valkey.UnitTests;
+
+internal sealed class TestAgentSession : AgentSession
+{
+    public TestAgentSession()
+    {
+        this.StateBag = new AgentSessionStateBag();
+    }
+}
+
+internal static class TestHelpers
+{
+    internal static readonly AIAgent MockAgent = new Mock<AIAgent>().Object;
+
+    internal static ChatHistoryProvider.InvokingContext CreateChatHistoryInvokingContext(
+        IEnumerable<ChatMessage>? requestMessages = null)
+    {
+#pragma warning disable MAAI001
+        return new ChatHistoryProvider.InvokingContext(
+            MockAgent,
+            new TestAgentSession(),
+            requestMessages ?? [new ChatMessage(ChatRole.User, "test")]);
+#pragma warning restore MAAI001
+    }
+
+    internal static ChatHistoryProvider.InvokedContext CreateChatHistoryInvokedContext(
+        IEnumerable<ChatMessage> requestMessages,
+        IEnumerable<ChatMessage> responseMessages)
+    {
+#pragma warning disable MAAI001
+        return new ChatHistoryProvider.InvokedContext(
+            MockAgent,
+            new TestAgentSession(),
+            requestMessages,
+            responseMessages);
+#pragma warning restore MAAI001
+    }
+}