Issue 22492. Increase number of event pumping cycles.

pkg/analysis_server/test/mocks.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 mocks;
 
 @MirrorsUsed(targets: 'mocks', override: '*')
 import 'dart:mirrors';
 import 'dart:async';
 import 'dart:io';
@@ skipping 40 matching lines @@
  * A [Matcher] that check that the given [Response] has an expected identifier
  * and no error.
  */
 Matcher isResponseSuccess(String id) => new _IsResponseSuccess(id);
 
 /**
  * Returns a [Future] that completes after pumping the event queue [times]
  * times. By default, this should pump the event queue enough times to allow
  * any code to run, as long as it's not waiting on some external event.
  */
-Future pumpEventQueue([int times = 50]) {
+Future pumpEventQueue([int times = 500]) {
   if (times == 0) return new Future.value();
   // We use a delayed future to allow microtask events to finish. The
   // Future.value or Future() constructors use scheduleMicrotask themselves and
   // would therefore not wait for microtask callbacks that are scheduled after
   // invoking this method.
   return new Future.delayed(Duration.ZERO, () => pumpEventQueue(times - 1));
 }
 
 typedef void MockServerOperationPerformFunction(AnalysisServer server);
 
@@ skipping 406 matching lines @@
     }
     return mismatchDescription;
   }
 
   @override
   bool matches(item, Map matchState) {
     Response response = item;
     return response != null && response.id == _id && response.error == null;
   }
 }