Create an apptesting framework for dart.

third_party/dart-packages/unittest/unittest/unittest.dart

Index: third_party/dart-packages/unittest/unittest/unittest.dart
diff --git a/sky/tests/resources/third_party/unittest/unittest.dart b/third_party/dart-packages/unittest/unittest/unittest.dart
similarity index 99%
copy from sky/tests/resources/third_party/unittest/unittest.dart
copy to third_party/dart-packages/unittest/unittest/unittest.dart
index ecc8c40c6f70ae9ad2d34eb40c9e1a2c0f4fb1a3..a22b271bc54a6834d95d13ed114b0b980c8526d5 100644
--- a/sky/tests/resources/third_party/unittest/unittest.dart
+++ b/third_party/dart-packages/unittest/unittest/unittest.dart
@@ -7,7 +7,7 @@ library unittest;
 import 'dart:async';
 import 'dart:collection';
 
-import '../matcher/matcher.dart' show TestFailure, wrapAsync;
+import 'package:matcher/matcher.dart' show TestFailure, wrapAsync;
 
 import 'src/configuration.dart';
 import 'src/expected_function.dart';
@@ -16,7 +16,7 @@ import 'src/internal_test_case.dart';
 import 'src/test_case.dart';
 import 'src/test_environment.dart';
 
-export '../matcher/matcher.dart';
+export 'package:matcher/matcher.dart';
 
 export 'src/configuration.dart';
 export 'src/simple_configuration.dart';