enable code completion integration test stub

pkg/analysis_server/test/operation/test_all.dart

Index: pkg/analysis_server/test/operation/test_all.dart
diff --git a/pkg/analysis_server/test/operation/test_all.dart b/pkg/analysis_server/test/operation/test_all.dart
index bada1e4dcf5af44f21e9fdc958d197e6c5fab5e7..4f7ce5495f5bc66ba94e1721ae8a76869828997a 100644
--- a/pkg/analysis_server/test/operation/test_all.dart
+++ b/pkg/analysis_server/test/operation/test_all.dart
@@ -2,6 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+library test.operation.all;
+
 import 'package:unittest/unittest.dart';
 
 import 'operation_queue_test.dart' as operation_queue_test;