internal/testing: add copyright header (#477)

internal/testing/fake_auth_server.go

@@ -1,3 +1,7 @@
+// Copyright 2025 The Go MCP SDK Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
 package testing
 
 import (
@@ -24,12 +28,6 @@ type authCodeInfo struct {
 	redirectURI   string
 }
 
-// // FakeAuthServer is a fake OAuth2 authorization server.
-// type FakeAuthServer struct {
-// 	server    *http.Server
-// 	authCodes map[string]authCodeInfo
-// }
-
 type state struct {
 	authCodes map[string]authCodeInfo
 }