Roll Observatory packages and add a roll script

packages/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 'package:scheduled_test/scheduled_test.dart';
+import 'package:watcher/watcher.dart';
+
+import '../utils.dart';
+
+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(expectAsync((event) {
+      expect(event, isWatchEvent(ChangeType.ADD, "file.txt"));
+      completer.complete();
+    }));
+
+    writeFile("file.txt");
+
+    // Then wait until we get an event for it.
+    schedule(() => completer.future);
+
+    // Unsubscribe.
+    schedule(() {
+      subscription.cancel();
+    });
+
+    // Now write a file while we aren't listening.
+    writeFile("unwatched.txt");
+
+    // Then start listening again.
+    schedule(() {
+      completer = new Completer();
+      subscription = watcher.events.listen(expectAsync((event) {
+        // We should get an event for the third file, not the one added while
+        // we weren't subscribed.
+        expect(event, isWatchEvent(ChangeType.ADD, "added.txt"));
+        completer.complete();
+      }));
+
+      // Wait until the watcher is ready to dispatch events again.
+      return watcher.ready;
+    });
+
+    // And add a third file.
+    writeFile("added.txt");
+
+    // Wait until we get an event for the third file.
+    schedule(() => completer.future);
+
+    schedule(() {
+      subscription.cancel();
+    });
+  });
+}