anchor.diff:        expect(observatoryContent, startsWith('<!DOCTYPE html>'));
   
         // Check that DevTools assets are accessible.
  -      final devtoolsRequest = await client.getUrl(dds.devToolsUri);
  +      final devtoolsRequest = await client.getUrl(dds!.devToolsUri!);
         final devtoolsResponse = await devtoolsRequest.close();
         expect(devtoolsResponse.statusCode, 200);
         final devtoolsContent =
  
positive.code:     process = null;
    });
  
    defineTest({bool authCodesEnabled}) {
      test(
          'Ensure Observatory and DevTools assets are available with '
          '${authCodesEnabled ? '' : 'no'} auth codes', () async {
  
negative.code: // Copyright (c) 2021, the Dart project authors.  Please see the AUTHORS file
  // 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.
  
  import 'dart:convert';
  import 'dart:io';
  