Replace the existing unittest APIs with the new runner infrastructure.

test/future_matchers_test.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.
-
-library unittest.future_matchers_test;
-
-import 'dart:async';
-
-import 'package:metatest/metatest.dart';
-import 'package:unittest/unittest.dart';
-
-void main() => initTests(_test);
-
-void _test(message) {
-  initMetatest(message);
-
-  expectTestResults('group name test', () {
-    test('completes - unexpected error', () {
-      var completer = new Completer();
-      completer.completeError('X');
-      expect(completer.future, completes);
-    });
-
-    test('completes - successfully', () {
-      var completer = new Completer();
-      completer.complete('1');
-      expect(completer.future, completes);
-    });
-
-    test('throws - unexpected to see normal completion', () {
-      var completer = new Completer();
-      completer.complete('1');
-      expect(completer.future, throws);
-    });
-
-    test('throws - expected to see exception', () {
-      var completer = new Completer();
-      completer.completeError('X');
-      expect(completer.future, throws);
-    });
-
-    test('throws - expected to see exception thrown later on', () {
-      var completer = new Completer();
-      var chained = completer.future.then((_) {
-        throw 'X';
-      });
-      expect(chained, throws);
-      completer.complete('1');
-    });
-
-    test('throwsA - unexpected normal completion', () {
-      var completer = new Completer();
-      completer.complete('1');
-      expect(completer.future, throwsA(equals('X')));
-    });
-
-    test('throwsA - correct error', () {
-      var completer = new Completer();
-      completer.completeError('X');
-      expect(completer.future, throwsA(equals('X')));
-    });
-
-    test('throwsA - wrong error', () {
-      var completer = new Completer();
-      completer.completeError('X');
-      expect(completer.future, throwsA(equals('Y')));
-    });
-  }, [
-    {
-      'result': 'fail',
-      'message': 'Expected future to complete successfully, but it failed with '
-          'X',
-    },
-    {'result': 'pass'},
-    {
-      'result': 'fail',
-      'message': 'Expected future to fail, but succeeded with \'1\'.'
-    },
-    {'result': 'pass'},
-    {'result': 'pass'},
-    {
-      'result': 'fail',
-      'message': 'Expected future to fail, but succeeded with \'1\'.'
-    },
-    {'result': 'pass'},
-    {
-      'result': 'fail',
-      'message': '''Expected: 'Y'
-  Actual: 'X'
-   Which: is different.
-Expected: Y
-  Actual: X
-          ^
- Differ at offset 0
-'''
-    }
-  ]);
-}