anchor.diff:      'ext.dart.io.getHttpEnableTimelineLogging';
   const String kHttpEnableTimelineLogging =
       'ext.dart.io.httpEnableTimelineLogging';
  +
   Future<void> setup() async {}
   
   Future<void> waitForStreamEvent(
  
positive.code:   },
    (VmService service, IsolateRef isolateRef) async {
      final isolateId = isolateRef.id;
      dynamic response = await service.getHttpEnableTimelineLogging(isolateId);
      expect(response.enabled, false);
  
      await waitForStreamEvent(service, isolateRef, true);
      response = await service.getHttpEnableTimelineLogging(isolateId);
      expect(response.enabled, true);
  
      await waitForStreamEvent(service, isolateRef, false);
      response = await service.getHttpEnableTimelineLogging(isolateId);
      expect(response.enabled, false);
    },
  
negative.code: 
  import 'dart:async';
  
  import 'package:test/test.dart';
  import 'package:vm_service/src/dart_io_extensions.dart';
  import 'package:vm_service/vm_service.dart';
  
  import 'common/service_test_common.dart';
  import 'common/test_helper.dart';
  
  