chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.GitHub.Copilot.UnitTests/CopilotClientExtensionsTests.cs

@@ -0,0 +1,88 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using GitHub.Copilot;
+using Microsoft.Extensions.AI;
+
+namespace Microsoft.Agents.AI.GitHub.Copilot.UnitTests;
+
+/// <summary>
+/// Unit tests for the <see cref="CopilotClientExtensions"/> class.
+/// </summary>
+public sealed class CopilotClientExtensionsTests
+{
+    [Fact]
+    public void AsAIAgent_WithAllParameters_ReturnsGitHubCopilotAgentWithSpecifiedProperties()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions());
+
+        const string TestId = "test-agent-id";
+        const string TestName = "Test Agent";
+        const string TestDescription = "This is a test agent description";
+
+        // Act
+        var agent = copilotClient.AsAIAgent(ownsClient: false, id: TestId, name: TestName, description: TestDescription, tools: null);
+
+        // Assert
+        Assert.NotNull(agent);
+        Assert.IsType<GitHubCopilotAgent>(agent);
+        Assert.Equal(TestId, agent.Id);
+        Assert.Equal(TestName, agent.Name);
+        Assert.Equal(TestDescription, agent.Description);
+    }
+
+    [Fact]
+    public void AsAIAgent_WithMinimalParameters_ReturnsGitHubCopilotAgent()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions());
+
+        // Act
+        var agent = copilotClient.AsAIAgent(ownsClient: false, tools: null);
+
+        // Assert
+        Assert.NotNull(agent);
+        Assert.IsType<GitHubCopilotAgent>(agent);
+    }
+
+    [Fact]
+    public void AsAIAgent_WithNullClient_ThrowsArgumentNullException()
+    {
+        // Arrange
+        CopilotClient? copilotClient = null;
+
+        // Act & Assert
+        Assert.Throws<ArgumentNullException>(() => copilotClient!.AsAIAgent(sessionConfig: null));
+    }
+
+    [Fact]
+    public void AsAIAgent_WithOwnsClient_ReturnsAgentThatOwnsClient()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions());
+
+        // Act
+        var agent = copilotClient.AsAIAgent(ownsClient: true, tools: null);
+
+        // Assert
+        Assert.NotNull(agent);
+        Assert.IsType<GitHubCopilotAgent>(agent);
+    }
+
+    [Fact]
+    public void AsAIAgent_WithTools_ReturnsAgentWithTools()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions());
+        List<AIFunctionDeclaration> tools = [AIFunctionFactory.Create(() => "test", "TestFunc", "Test function")];
+
+        // Act
+        var agent = copilotClient.AsAIAgent(tools: tools);
+
+        // Assert
+        Assert.NotNull(agent);
+        Assert.IsType<GitHubCopilotAgent>(agent);
+    }
+}