chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/Extensions/A2AAgentCardExtensionsTests.cs

@@ -0,0 +1,287 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Net;
+using System.Net.Http;
+using System.Text;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using A2A;
+
+namespace Microsoft.Agents.AI.A2A.UnitTests;
+
+/// <summary>
+/// Unit tests for the <see cref="A2AAgentCardExtensions"/> class.
+/// </summary>
+public sealed class A2AAgentCardExtensionsTests
+{
+    private readonly AgentCard _agentCard;
+
+    public A2AAgentCardExtensionsTests()
+    {
+        this._agentCard = new AgentCard
+        {
+            Name = "Test Agent",
+            Description = "A test agent for unit testing",
+            SupportedInterfaces = [new AgentInterface { Url = "http://test-endpoint/agent" }]
+        };
+    }
+
+    [Fact]
+    public void AsAIAgent_ReturnsAIAgent()
+    {
+        // Act
+        var agent = this._agentCard.AsAIAgent();
+
+        // Assert
+        Assert.NotNull(agent);
+        Assert.IsType<A2AAgent>(agent);
+        Assert.Equal("Test Agent", agent.Name);
+        Assert.Equal("A test agent for unit testing", agent.Description);
+    }
+
+    [Fact]
+    public async Task RunIAgentAsync_SendsRequestToTheUrlSpecifiedInAgentCardAsync()
+    {
+        // Arrange
+        using var handler = new HttpMessageHandlerStub();
+        using var httpClient = new HttpClient(handler, false);
+
+        handler.ResponsesToReturn.Enqueue(new Message
+        {
+            Role = Role.Agent,
+            Parts = [Part.FromText("Response")],
+        });
+
+        var agent = this._agentCard.AsAIAgent(httpClient: httpClient);
+
+        // Act
+        await agent.RunAsync("Test input");
+
+        // Assert
+        Assert.Single(handler.CapturedUris);
+        Assert.Equal(new Uri("http://test-endpoint/agent"), handler.CapturedUris[0]);
+    }
+
+    [Fact]
+    public async Task AsAIAgent_WithPreferredBindings_UsesMatchingInterfaceAsync()
+    {
+        // Arrange
+        var card = new AgentCard
+        {
+            Name = "Multi-Interface Agent",
+            Description = "An agent with multiple interfaces",
+            SupportedInterfaces =
+            [
+                new AgentInterface { Url = "http://first/agent", ProtocolBinding = ProtocolBindingNames.HttpJson },
+                new AgentInterface { Url = "http://second/agent", ProtocolBinding = ProtocolBindingNames.JsonRpc },
+            ]
+        };
+
+        using var handler = new HttpMessageHandlerStub();
+        using var httpClient = new HttpClient(handler, false);
+
+        handler.ResponsesToReturn.Enqueue(new Message
+        {
+            Role = Role.Agent,
+            Parts = [Part.FromText("Response")],
+        });
+
+        var options = new A2AClientOptions
+        {
+            PreferredBindings = [ProtocolBindingNames.JsonRpc]
+        };
+
+        var agent = card.AsAIAgent(httpClient, options: options);
+
+        // Act
+        await agent.RunAsync("Test input");
+
+        // Assert
+        Assert.Single(handler.CapturedUris);
+        Assert.Equal(new Uri("http://second/agent"), handler.CapturedUris[0]);
+    }
+
+    [Fact]
+    public void AsAIAgent_WithNullOptions_UsesDefaultBindingPreference()
+    {
+        // Arrange
+        var card = new AgentCard
+        {
+            Name = "Default Options Agent",
+            Description = "Tests default A2AClientOptions behavior",
+            SupportedInterfaces =
+            [
+                new AgentInterface { Url = "http://default/agent" },
+            ]
+        };
+
+        // Act - null options should use defaults (HTTP+JSON first, JSON-RPC as fallback)
+        var agent = card.AsAIAgent(options: null);
+
+        // Assert
+        Assert.NotNull(agent);
+        Assert.IsType<A2AAgent>(agent);
+        Assert.Equal("Default Options Agent", agent.Name);
+    }
+
+    [Fact]
+    public void AsAIAgent_WithNoMatchingBinding_ThrowsException()
+    {
+        // Arrange
+        var card = new AgentCard
+        {
+            Name = "Unmatched Binding Agent",
+            Description = "Agent with unsupported binding only",
+            SupportedInterfaces =
+            [
+                new AgentInterface { Url = "http://grpc/agent", ProtocolBinding = "GRPC" },
+            ]
+        };
+
+        var options = new A2AClientOptions
+        {
+            PreferredBindings = [ProtocolBindingNames.JsonRpc]
+        };
+
+        // Act & Assert - factory should throw when no matching binding exists
+        Assert.ThrowsAny<Exception>(() => card.AsAIAgent(options: options));
+    }
+
+    [Fact]
+    public void AsAIAgent_WithNoSupportedInterfaces_ThrowsException()
+    {
+        // Arrange
+        var card = new AgentCard
+        {
+            Name = "No Interfaces Agent",
+            Description = "Agent with no supported interfaces",
+        };
+
+        // Act & Assert
+        Assert.ThrowsAny<Exception>(() => card.AsAIAgent());
+    }
+
+    [Fact]
+    public void AsAIAgent_WithAgentOptions_OverridesCardValues()
+    {
+        // Arrange
+        var card = new AgentCard
+        {
+            Name = "Card Agent",
+            Description = "Card description",
+            SupportedInterfaces = [new AgentInterface { Url = "http://test-endpoint/agent" }]
+        };
+
+        var agentOptions = new A2AAgentOptions
+        {
+            Id = "custom-id",
+            Name = "Custom Agent",
+            Description = "Custom description"
+        };
+
+        // Act
+        var agent = card.AsAIAgent(agentOptions);
+
+        // Assert
+        Assert.NotNull(agent);
+        Assert.IsType<A2AAgent>(agent);
+        Assert.Equal("custom-id", agent.Id);
+        Assert.Equal("Custom Agent", agent.Name);
+        Assert.Equal("Custom description", agent.Description);
+    }
+
+    [Fact]
+    public void AsAIAgent_WithAgentOptions_FallsBackToCardValues()
+    {
+        // Arrange
+        var card = new AgentCard
+        {
+            Name = "Card Agent",
+            Description = "Card description",
+            SupportedInterfaces = [new AgentInterface { Url = "http://test-endpoint/agent" }]
+        };
+
+        var agentOptions = new A2AAgentOptions
+        {
+            Id = "custom-id"
+        };
+
+        // Act
+        var agent = card.AsAIAgent(agentOptions);
+
+        // Assert
+        Assert.NotNull(agent);
+        Assert.Equal("custom-id", agent.Id);
+        Assert.Equal("Card Agent", agent.Name);
+        Assert.Equal("Card description", agent.Description);
+    }
+
+    [Fact]
+    public void AsAIAgent_WithEmptyAgentOptions_UsesCardValues()
+    {
+        // Arrange
+        var card = new AgentCard
+        {
+            Name = "Card Agent",
+            Description = "Card description",
+            SupportedInterfaces = [new AgentInterface { Url = "http://test-endpoint/agent" }]
+        };
+
+        // Act
+        var agent = card.AsAIAgent(new A2AAgentOptions());
+
+        // Assert
+        Assert.NotNull(agent);
+        Assert.Equal("Card Agent", agent.Name);
+        Assert.Equal("Card description", agent.Description);
+    }
+
+    internal sealed class HttpMessageHandlerStub : HttpMessageHandler
+    {
+        public Queue ResponsesToReturn { get; } = new();
+
+        public List<Uri> CapturedUris { get; } = [];
+
+        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        {
+            this.CapturedUris.Add(request.RequestUri!);
+
+            var response = this.ResponsesToReturn.Dequeue();
+
+            if (response is AgentCard agentCard)
+            {
+                var json = JsonSerializer.Serialize(agentCard);
+                return new HttpResponseMessage(HttpStatusCode.OK)
+                {
+                    Content = new StringContent(json, Encoding.UTF8, "application/json")
+                };
+            }
+            else if (response is Message message)
+            {
+                var sendMessageResponse = new SendMessageResponse { Message = message };
+                var jsonRpcResponse = new JsonRpcResponse
+                {
+                    Id = "response-id",
+                    Result = JsonSerializer.SerializeToNode(sendMessageResponse, A2AJsonUtilities.DefaultOptions)
+                };
+
+                return new HttpResponseMessage(HttpStatusCode.OK)
+                {
+                    Content = new StringContent(JsonSerializer.Serialize(jsonRpcResponse, A2AJsonUtilities.DefaultOptions), Encoding.UTF8, "application/json")
+                };
+            }
+
+            // Return empty agent card if none specified
+            var emptyCard = new AgentCard();
+            var emptyJson = JsonSerializer.Serialize(emptyCard);
+            return new HttpResponseMessage(HttpStatusCode.OK)
+            {
+                Content = new StringContent(emptyJson, Encoding.UTF8, "application/json")
+            };
+        }
+    }
+}