.NET: Improve unit test coverage for Microsoft.Agents.AI.Abstractions

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

@@ -0,0 +1,42 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Microsoft.Agents.AI.Abstractions.UnitTests;
+
+/// <summary>
+/// Unit tests for the <see cref="AIAgentMetadata"/> class.
+/// </summary>
+public class AIAgentMetadataTests
+{
+    [Fact]
+    public void Constructor_WithNoArguments_SetsProviderNameToNull()
+    {
+        // Arrange & Act
+        AIAgentMetadata metadata = new();
+
+        // Assert
+        Assert.Null(metadata.ProviderName);
+    }
+
+    [Fact]
+    public void Constructor_WithProviderName_SetsProperty()
+    {
+        // Arrange
+        const string ProviderName = "TestProvider";
+
+        // Act
+        AIAgentMetadata metadata = new(ProviderName);
+
+        // Assert
+        Assert.Equal(ProviderName, metadata.ProviderName);
+    }
+
+    [Fact]
+    public void Constructor_WithNullProviderName_SetsProviderNameToNull()
+    {
+        // Arrange & Act
+        AIAgentMetadata metadata = new(null);
+
+        // Assert
+        Assert.Null(metadata.ProviderName);
+    }
+}

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

@@ -364,6 +364,74 @@ public void GetService_Generic_ReturnsNullForUnrelatedType()
 
     #endregion
 
+    #region Name and Description Property Tests
+
+    /// <summary>
+    /// Verify that Name property returns the value from the derived class.
+    /// </summary>
+    [Fact]
+    public void Name_ReturnsValueFromDerivedClass()
+    {
+        // Arrange
+        var agent = new MockAgentWithName("TestAgentName", "TestAgentDescription");
+
+        // Act
+        string? name = agent.Name;
+
+        // Assert
+        Assert.Equal("TestAgentName", name);
+    }
+
+    /// <summary>
+    /// Verify that Description property returns the value from the derived class.
+    /// </summary>
+    [Fact]
+    public void Description_ReturnsValueFromDerivedClass()
+    {
+        // Arrange
+        var agent = new MockAgentWithName("TestAgentName", "TestAgentDescription");
+
+        // Act
+        string? description = agent.Description;
+
+        // Assert
+        Assert.Equal("TestAgentDescription", description);
+    }
+
+    /// <summary>
+    /// Verify that Name property returns null when not overridden.
+    /// </summary>
+    [Fact]
+    public void Name_ReturnsNullByDefault()
+    {
+        // Arrange
+        var agent = new MockAgent();
+
+        // Act
+        string? name = agent.Name;
+
+        // Assert
+        Assert.Null(name);
+    }
+
+    /// <summary>
+    /// Verify that Description property returns null when not overridden.
+    /// </summary>
+    [Fact]
+    public void Description_ReturnsNullByDefault()
+    {
+        // Arrange
+        var agent = new MockAgent();
+
+        // Act
+        string? description = agent.Description;
+
+        // Assert
+        Assert.Null(description);
+    }
+
+    #endregion
+
     /// <summary>
     /// Typed mock session.
     /// </summary>
@@ -402,6 +470,44 @@ protected override IAsyncEnumerable<AgentResponseUpdate> RunCoreStreamingAsync(
             throw new NotImplementedException();
     }
 
+    private sealed class MockAgentWithName : AIAgent
+    {
+        private readonly string? _name;
+        private readonly string? _description;
+
+        public MockAgentWithName(string? name, string? description)
+        {
+            this._name = name;
+            this._description = description;
+        }
+
+        public override string? Name => this._name;
+        public override string? Description => this._description;
+
+        public override ValueTask<AgentSession> CreateSessionAsync(CancellationToken cancellationToken = default)
+            => throw new NotImplementedException();
+
+        public override ValueTask<AgentSession> DeserializeSessionAsync(JsonElement serializedSession, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
+            => throw new NotImplementedException();
+
+        public override JsonElement SerializeSession(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null)
+            => throw new NotImplementedException();
+
+        protected override Task<AgentResponse> RunCoreAsync(
+            IEnumerable<ChatMessage> messages,
+            AgentSession? session = null,
+            AgentRunOptions? options = null,
+            CancellationToken cancellationToken = default) =>
+            throw new NotImplementedException();
+
+        protected override IAsyncEnumerable<AgentResponseUpdate> RunCoreStreamingAsync(
+            IEnumerable<ChatMessage> messages,
+            AgentSession? session = null,
+            AgentRunOptions? options = null,
+            CancellationToken cancellationToken = default) =>
+            throw new NotImplementedException();
+    }
+
     private static async IAsyncEnumerable<T> ToAsyncEnumerableAsync<T>(IEnumerable<T> values)
     {
         await Task.Yield();

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

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using System;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Threading;
 using System.Threading.Tasks;
@@ -155,6 +156,111 @@ public void GetService_Generic_ReturnsNullForUnrelatedType()
 
     #endregion
 
+    #region InvokingContext Tests
+
+    [Fact]
+    public void InvokingContext_RequestMessages_SetterThrowsForNull()
+    {
+        // Arrange
+        var messages = new ReadOnlyCollection<ChatMessage>([new(ChatRole.User, "Hello")]);
+        var context = new AIContextProvider.InvokingContext(messages);
+
+        // Act & Assert
+        Assert.Throws<ArgumentNullException>(() => context.RequestMessages = null!);
+    }
+
+    [Fact]
+    public void InvokingContext_RequestMessages_SetterRoundtrips()
+    {
+        // Arrange
+        var initialMessages = new ReadOnlyCollection<ChatMessage>([new(ChatRole.User, "Hello")]);
+        var newMessages = new List<ChatMessage> { new(ChatRole.User, "New message") };
+        var context = new AIContextProvider.InvokingContext(initialMessages);
+
+        // Act
+        context.RequestMessages = newMessages;
+
+        // Assert
+        Assert.Same(newMessages, context.RequestMessages);
+    }
+
+    #endregion
+
+    #region InvokedContext Tests
+
+    [Fact]
+    public void InvokedContext_RequestMessages_SetterThrowsForNull()
+    {
+        // Arrange
+        var messages = new ReadOnlyCollection<ChatMessage>([new(ChatRole.User, "Hello")]);
+        var context = new AIContextProvider.InvokedContext(messages, aiContextProviderMessages: null);
+
+        // Act & Assert
+        Assert.Throws<ArgumentNullException>(() => context.RequestMessages = null!);
+    }
+
+    [Fact]
+    public void InvokedContext_RequestMessages_SetterRoundtrips()
+    {
+        // Arrange
+        var initialMessages = new ReadOnlyCollection<ChatMessage>([new(ChatRole.User, "Hello")]);
+        var newMessages = new List<ChatMessage> { new(ChatRole.User, "New message") };
+        var context = new AIContextProvider.InvokedContext(initialMessages, aiContextProviderMessages: null);
+
+        // Act
+        context.RequestMessages = newMessages;
+
+        // Assert
+        Assert.Same(newMessages, context.RequestMessages);
+    }
+
+    [Fact]
+    public void InvokedContext_AIContextProviderMessages_Roundtrips()
+    {
+        // Arrange
+        var requestMessages = new ReadOnlyCollection<ChatMessage>([new(ChatRole.User, "Hello")]);
+        var aiContextMessages = new List<ChatMessage> { new(ChatRole.System, "AI context message") };
+        var context = new AIContextProvider.InvokedContext(requestMessages, aiContextProviderMessages: null);
+
+        // Act
+        context.AIContextProviderMessages = aiContextMessages;
+
+        // Assert
+        Assert.Same(aiContextMessages, context.AIContextProviderMessages);
+    }
+
+    [Fact]
+    public void InvokedContext_ResponseMessages_Roundtrips()
+    {
+        // Arrange
+        var requestMessages = new ReadOnlyCollection<ChatMessage>([new(ChatRole.User, "Hello")]);
+        var responseMessages = new List<ChatMessage> { new(ChatRole.Assistant, "Response message") };
+        var context = new AIContextProvider.InvokedContext(requestMessages, aiContextProviderMessages: null);
+
+        // Act
+        context.ResponseMessages = responseMessages;
+
+        // Assert
+        Assert.Same(responseMessages, context.ResponseMessages);
+    }
+
+    [Fact]
+    public void InvokedContext_InvokeException_Roundtrips()
+    {
+        // Arrange
+        var requestMessages = new ReadOnlyCollection<ChatMessage>([new(ChatRole.User, "Hello")]);
+        var exception = new InvalidOperationException("Test exception");
+        var context = new AIContextProvider.InvokedContext(requestMessages, aiContextProviderMessages: null);
+
+        // Act
+        context.InvokeException = exception;
+
+        // Assert
+        Assert.Same(exception, context.InvokeException);
+    }
+
+    #endregion
+
     private sealed class TestAIContextProvider : AIContextProvider
     {
         public override ValueTask<AIContext> InvokingAsync(InvokingContext context, CancellationToken cancellationToken = default)

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

@@ -346,4 +346,91 @@ public void TryParseAsStructuredOutputFailsWithIncorrectTypedJson()
         // Act & Assert.
         Assert.False(response.TryDeserialize<Animal>(TestJsonSerializerContext.Default.Options, out _));
     }
+
+    [Fact]
+    public void UserInputRequests_ReturnsEmptyWhenNoMessages()
+    {
+        // Arrange
+        AgentResponse response = new();
+
+        // Act
+        IEnumerable<UserInputRequestContent> requests = response.UserInputRequests;
+
+        // Assert
+        Assert.Empty(requests);
+    }
+
+    [Fact]
+    public void UserInputRequests_ReturnsEmptyWhenNoUserInputRequestContent()
+    {
+        // Arrange
+        AgentResponse response = new(new ChatMessage(ChatRole.Assistant, "Hello"));
+
+        // Act
+        IEnumerable<UserInputRequestContent> requests = response.UserInputRequests;
+
+        // Assert
+        Assert.Empty(requests);
+    }
+
+    [Fact]
+    public void ToAgentResponseUpdatesWithNoMessagesProducesEmptyArray()
+    {
+        // Arrange
+        AgentResponse response = new();
+
+        // Act
+        AgentResponseUpdate[] updates = response.ToAgentResponseUpdates();
+
+        // Assert
+        Assert.Empty(updates);
+    }
+
+    [Fact]
+    public void ToAgentResponseUpdatesWithUsageOnlyProducesSingleUpdate()
+    {
+        // Arrange
+        AgentResponse response = new()
+        {
+            Usage = new UsageDetails { TotalTokenCount = 100 }
+        };
+
+        // Act
+        AgentResponseUpdate[] updates = response.ToAgentResponseUpdates();
+
+        // Assert
+        AgentResponseUpdate update = Assert.Single(updates);
+        UsageContent usageContent = Assert.IsType<UsageContent>(update.Contents[0]);
+        Assert.Equal(100, usageContent.Details.TotalTokenCount);
+    }
+
+    [Fact]
+    public void ToAgentResponseUpdatesWithAdditionalPropertiesOnlyProducesSingleUpdate()
+    {
+        // Arrange
+        AgentResponse response = new()
+        {
+            AdditionalProperties = new() { ["key"] = "value" }
+        };
+
+        // Act
+        AgentResponseUpdate[] updates = response.ToAgentResponseUpdates();
+
+        // Assert
+        AgentResponseUpdate update = Assert.Single(updates);
+        Assert.NotNull(update.AdditionalProperties);
+        Assert.Equal("value", update.AdditionalProperties!["key"]);
+    }
+
+    [Fact]
+    public void Deserialize_ThrowsWhenDeserializationReturnsNull()
+    {
+        // Arrange
+        AgentResponse response = new(new ChatMessage(ChatRole.Assistant, "null"));
+
+        // Act & Assert
+        InvalidOperationException exception = Assert.Throws<InvalidOperationException>(
+            () => response.Deserialize<Animal>(TestJsonSerializerContext.Default.Options));
+        Assert.Equal("The deserialized response is null.", exception.Message);
+    }
 }