Wrap Directory.watch on linux for the watcher package.

pkg/watcher/test/ready/shared.dart

Index: pkg/watcher/test/ready/shared.dart
diff --git a/pkg/watcher/test/ready_test.dart b/pkg/watcher/test/ready/shared.dart
similarity index 95%
rename from pkg/watcher/test/ready_test.dart
rename to pkg/watcher/test/ready/shared.dart
index 11b77e02c7ef061ea7dc8126273d39d7c04923d3..af1b58f990d5f17abae84934f588695cdab77c93 100644
--- a/pkg/watcher/test/ready_test.dart
+++ b/pkg/watcher/test/ready/shared.dart
@@ -2,17 +2,11 @@
 // 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 'package:scheduled_test/scheduled_test.dart';
 
-import 'utils.dart';
-
-main() {
-  initConfig();
-
-  setUp(createSandbox);
+import '../utils.dart';
 
+sharedTests() {
   test('ready does not complete until after subscription', () {
     var watcher = createWatcher(waitForReady: false);