Roll Observatory packages and add a roll script

packages/unittest/test/async_setup_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.async_setup_teardown;
+
+import 'dart:async';
+
+import 'package:metatest/metatest.dart';
+import 'package:unittest/unittest.dart';
+
+void main() => initTests(_test);
+
+void _test(message) {
+  initMetatest(message);
+
+  expectTestsPass('good setup/good teardown', () {
+    setUp(() {
+      return new Future.value(0);
+    });
+    tearDown(() {
+      return new Future.value(0);
+    });
+    test('foo1', () {});
+  });
+
+  expectTestResults('good setup/bad teardown', () {
+    setUp(() {
+      return new Future.value(0);
+    });
+    tearDown(() {
+      return new Future.error("Failed to complete tearDown");
+    });
+    test('foo2', () {});
+  }, [
+    {
+      'result': 'error',
+      'message': 'Teardown failed: Caught Failed to complete tearDown'
+    }
+  ]);
+
+  expectTestResults('bad setup/good teardown', () {
+    setUp(() {
+      return new Future.error("Failed to complete setUp");
+    });
+    tearDown(() {
+      return new Future.value(0);
+    });
+    test('foo3', () {});
+  }, [
+    {
+      'result': 'error',
+      'message': 'Setup failed: Caught Failed to complete setUp'
+    }
+  ]);
+
+  expectTestResults('bad setup/bad teardown', () {
+    setUp(() {
+      return new Future.error("Failed to complete setUp");
+    });
+    tearDown(() {
+      return new Future.error("Failed to complete tearDown");
+    });
+    test('foo4', () {});
+  }, [
+    {
+      'result': 'error',
+      'message': 'Setup failed: Caught Failed to complete setUp'
+    }
+  ]);
+}