Fix tests for McpTask double-wrapping: provide DI services at tool creation time

Agent-Logs-Url: https://github.com/modelcontextprotocol/csharp-sdk/sessions/0b57604e-d75a-4879-a7ed-139c8e03ec6b

Co-authored-by: jeffhandley <1031940+jeffhandley@users.noreply.github.com>

Author: Copilot

tests/ModelContextProtocol.Tests/Server/ToolTaskSupportTests.cs

@@ -666,6 +666,11 @@ public async Task Tool_ReturningMcpTask_BypassesSdkTaskWrapping()
         // Arrange - Server with task store and a tool that creates and returns its own McpTask
         var taskStore = new InMemoryMcpTaskStore();
 
+        // Build a service provider so the tool can resolve IMcpTaskStore at creation time
+        var toolServices = new ServiceCollection();
+        toolServices.AddSingleton<IMcpTaskStore>(taskStore);
+        var toolServiceProvider = toolServices.BuildServiceProvider();
+
         await using var fixture = new ClientServerFixture(
             LoggerFactory,
             configureServer: builder =>
@@ -684,7 +689,8 @@ public async Task Tool_ReturningMcpTask_BypassesSdkTaskWrapping()
                     {
                         Name = "self-managing-tool",
                         Description = "A tool that creates and returns its own McpTask",
-                        Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Optional }
+                        Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Optional },
+                        Services = toolServiceProvider
                     })]);
             },
             configureServices: services =>
@@ -716,6 +722,11 @@ public async Task Tool_ReturningMcpTask_WithoutTaskMetadata_ReturnsTaskDirectly(
         // Arrange - Server with task store and a tool that returns McpTask
         var taskStore = new InMemoryMcpTaskStore();
 
+        // Build a service provider so the tool can resolve IMcpTaskStore at creation time
+        var toolServices = new ServiceCollection();
+        toolServices.AddSingleton<IMcpTaskStore>(taskStore);
+        var toolServiceProvider = toolServices.BuildServiceProvider();
+
         await using var fixture = new ClientServerFixture(
             LoggerFactory,
             configureServer: builder =>
@@ -733,7 +744,8 @@ public async Task Tool_ReturningMcpTask_WithoutTaskMetadata_ReturnsTaskDirectly(
                     {
                         Name = "self-managing-tool",
                         Description = "A tool that creates and returns its own McpTask",
-                        Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Optional }
+                        Execution = new ToolExecution { TaskSupport = ToolTaskSupport.Optional },
+                        Services = toolServiceProvider
                     })]);
             },
             configureServices: services =>