Take a broader approach to filtering out bogus Mac OS watcher events.

pkg/watcher/test/utils.dart

 // Copyright (c) 2012, 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 watcher.test.utils;
 
 import 'dart:async';
-import 'dart:collection';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
 import 'package:scheduled_test/scheduled_stream.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:unittest/compact_vm_config.dart';
 import 'package:watcher/watcher.dart';
 import 'package:watcher/src/stat.dart';
 import 'package:watcher/src/utils.dart';
 
@@ skipping 367 matching lines @@
   var results = new Set();
   for (var i = 0; i < limit; i++) {
     for (var j = 0; j < limit; j++) {
       for (var k = 0; k < limit; k++) {
         results.add(callback(i, j, k));
       }
     }
   }
   return results;
 }