Roll Observatory packages and add a roll script

packages/unittest/test/setup_and_teardown_test.dart

+// Copyright (c) 2013, 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 unittest.setup_and_teardown_test;
+
+import 'package:unittest/unittest.dart';
+
+import 'package:metatest/metatest.dart';
+
+void main() => initTests(_test);
+
+void _test(message) {
+  initMetatest(message);
+
+  expectTestsPass('setup and teardown test', () {
+    var hasSetup = false;
+    var hasTeardown = false;
+
+    group('a', () {
+      setUp(() {
+        hasSetup = true;
+      });
+      tearDown(() {
+        hasTeardown = true;
+      });
+      test('test', () {});
+    });
+
+    test('verify', () {
+      expect(hasSetup, isTrue);
+      expect(hasTeardown, isTrue);
+    });
+  });
+}