address copilot comments

Author: SergeyMenshykh

dotnet/src/Microsoft.Agents.AI.Hosting.A2A.AspNetCore/Microsoft.Agents.AI.Hosting.A2A.AspNetCore.csproj

@@ -16,7 +16,7 @@
     <InjectSharedDiagnosticIds>true</InjectSharedDiagnosticIds>
     <InjectExperimentalAttributeOnLegacy>true</InjectExperimentalAttributeOnLegacy>
   </PropertyGroup>
-  
+
   <ItemGroup>
     <PackageReference Include="A2A.AspNetCore" />
   </ItemGroup>
@@ -28,7 +28,7 @@
   <ItemGroup>
     <ProjectReference Include="..\Microsoft.Agents.AI.Hosting.A2A\Microsoft.Agents.AI.Hosting.A2A.csproj" />
   </ItemGroup>
-  
+
   <PropertyGroup>
     <!-- NuGet Package Settings -->
     <Title>Microsoft Agent Framework Hosting A2A ASP.NET Core</Title>

dotnet/tests/Microsoft.Agents.AI.Hosting.A2A.UnitTests/A2AAgentHandlerTests.cs

@@ -890,4 +890,4 @@ private sealed class EventCollector
     }
 
     private sealed class TestAgentSession : AgentSession;
-}
+}

dotnet/tests/Microsoft.Agents.AI.Hosting.A2A.UnitTests/A2AEndpointRouteBuilderExtensionsTests.cs

@@ -391,4 +391,50 @@ public void AddA2AServer_NullAgentBuilder_ThrowsArgumentNullException()
 
         Assert.Equal("agentBuilder", exception.ParamName);
     }
+
+    /// <summary>
+    /// Verifies that MapA2AHttpJson throws InvalidOperationException when no A2AServer has been
+    /// registered for the specified agent via AddA2AServer.
+    /// </summary>
+    [Fact]
+    public void MapA2AHttpJson_WithoutAddA2AServer_ThrowsInvalidOperationException()
+    {
+        // Arrange
+        WebApplicationBuilder builder = WebApplication.CreateBuilder();
+        IChatClient mockChatClient = new DummyChatClient();
+        builder.Services.AddKeyedSingleton("chat-client", mockChatClient);
+        builder.AddAIAgent("agent", "Instructions", chatClientServiceKey: "chat-client");
+        builder.Services.AddLogging();
+        using WebApplication app = builder.Build();
+
+        // Act & Assert
+        InvalidOperationException exception = Assert.Throws<InvalidOperationException>(() =>
+            app.MapA2AHttpJson("agent", "/a2a"));
+
+        Assert.Contains("agent", exception.Message);
+        Assert.Contains("AddA2AServer", exception.Message);
+    }
+
+    /// <summary>
+    /// Verifies that MapA2AJsonRpc throws InvalidOperationException when no A2AServer has been
+    /// registered for the specified agent via AddA2AServer.
+    /// </summary>
+    [Fact]
+    public void MapA2AJsonRpc_WithoutAddA2AServer_ThrowsInvalidOperationException()
+    {
+        // Arrange
+        WebApplicationBuilder builder = WebApplication.CreateBuilder();
+        IChatClient mockChatClient = new DummyChatClient();
+        builder.Services.AddKeyedSingleton("chat-client", mockChatClient);
+        builder.AddAIAgent("agent", "Instructions", chatClientServiceKey: "chat-client");
+        builder.Services.AddLogging();
+        using WebApplication app = builder.Build();
+
+        // Act & Assert
+        InvalidOperationException exception = Assert.Throws<InvalidOperationException>(() =>
+            app.MapA2AJsonRpc("agent", "/a2a"));
+
+        Assert.Contains("agent", exception.Message);
+        Assert.Contains("AddA2AServer", exception.Message);
+    }
 }