pkg/watcher: prepare for 0.9.3

pkg/watcher/test/no_subscription/shared.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.
 
 import 'dart:async';
-import 'dart:io';
 
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:watcher/watcher.dart';
 
 import '../utils.dart';
 
-sharedTests() {
+void sharedTests() {
   test('does not notify for changes when there are no subscribers', () {
     // Note that this test doesn't rely as heavily on the test functions in
     // utils.dart because it needs to be very explicit about when the event
     // stream is and is not subscribed.
     var watcher = createWatcher();
 
     // Subscribe to the events.
     var completer = new Completer();
     var subscription = watcher.events.listen(wrapAsync((event) {
       expect(event, isWatchEvent(ChangeType.ADD, "file.txt"));
@@ skipping 31 matching lines @@
     writeFile("added.txt");
 
     // Wait until we get an event for the third file.
     schedule(() => completer.future);
 
     schedule(() {
       subscription.cancel();
     });
   });
 }