chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AIContextTests.cs

@@ -0,0 +1,61 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Linq;
+using Microsoft.Extensions.AI;
+
+namespace Microsoft.Agents.AI.Abstractions.UnitTests;
+
+/// <summary>
+/// Unit tests for <see cref="AIContext"/>.
+/// </summary>
+public class AIContextTests
+{
+    [Fact]
+    public void SetInstructionsRoundtrips()
+    {
+        var context = new AIContext
+        {
+            Instructions = "Test Instructions"
+        };
+
+        Assert.Equal("Test Instructions", context.Instructions);
+    }
+
+    [Fact]
+    public void SetMessagesRoundtrips()
+    {
+        var context = new AIContext
+        {
+            Messages =
+            [
+                new(ChatRole.User, "Hello"),
+                new(ChatRole.Assistant, "Hi there!")
+            ]
+        };
+
+        Assert.NotNull(context.Messages);
+        var messages = context.Messages.ToList();
+        Assert.Equal(2, messages.Count);
+        Assert.Equal("Hello", messages[0].Text);
+        Assert.Equal("Hi there!", messages[1].Text);
+    }
+
+    [Fact]
+    public void SetAIFunctionsRoundtrips()
+    {
+        var context = new AIContext
+        {
+            Tools =
+            [
+                AIFunctionFactory.Create(() => "Function1", "Function1", "Description1"),
+                AIFunctionFactory.Create(() => "Function2", "Function2", "Description2"),
+            ]
+        };
+
+        Assert.NotNull(context.Tools);
+        var tools = context.Tools.ToList();
+        Assert.Equal(2, tools.Count);
+        Assert.Equal("Function1", tools[0].Name);
+        Assert.Equal("Function2", tools[1].Name);
+    }
+}