Replace the existing unittest APIs with the new runner infrastructure.

test/exception_test.dart

Index: test/exception_test.dart
diff --git a/test/exception_test.dart b/test/exception_test.dart
deleted file mode 100644
index 137f0a3661108d40df7c58f49cf3b718343d6393..0000000000000000000000000000000000000000
--- a/test/exception_test.dart
+++ /dev/null
@@ -1,21 +0,0 @@
-// 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.exception_test;
-
-import 'package:unittest/unittest.dart';
-
-import 'package:metatest/metatest.dart';
-
-void main() => initTests(_test);
-
-void _test(message) {
-  initMetatest(message);
-
-  expectTestResults('good setup/good teardown', () {
-    test('test', () {
-      throw new Exception('Fail.');
-    });
-  }, [{'result': 'error', 'message': 'Test failed: Caught Exception: Fail.'}]);
-}