Increase delay when after eventually consistent operations in datastore/storage

test/datastore/e2e/datastore_test_impl.dart

 // Copyright (c) 2014, 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.
 
 library datastore_test;
 
 /// NOTE: In order to run these tests, the following datastore indices must
 /// exist:
 /// $ cat index.yaml
 /// indexes:
@@ skipping 21 matching lines @@
 import 'package:gcloud/datastore.dart';
 import 'package:gcloud/src/datastore_impl.dart' as datastore_impl;
 import 'package:gcloud/common.dart';
 import 'package:unittest/unittest.dart';
 
 import '../error_matchers.dart';
 import 'utils.dart';
 
 import '../../common_e2e.dart';
 
-// Note:
-// Non-ancestor queries (i.e. queries not lookups) result in index scans.
-// The index tables are updated in a "eventually consistent" way.
-//
-// So this can make tests flaky, the index updates take longer than the
-// following constant.
-const INDEX_UPDATE_DELAY = const Duration(seconds: 10);
-
 Future sleep(Duration duration) {
   var completer = new Completer();
   new Timer(duration, completer.complete);
   return completer.future;
 }
 
 Future<List<Entity>> consumePages(FirstPageProvider provider) {
   return new StreamFromPages(provider).stream.toList();
 }
 
@@ skipping 977 matching lines @@
 main() {
   var scopes = datastore_impl.DatastoreImpl.SCOPES;
 
   withAuthClient(scopes, (String project, httpClient) {
     var datastore = new datastore_impl.DatastoreImpl(httpClient, 's~$project');
     return cleanupDB(datastore).then((_) {
       return runE2EUnittest(() => runTests(datastore));
     });
   });
 }