pkg/matcher: refactor with unittest v0.12 work

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 matcher.future_matchers_test;
-
-import 'dart:async';
-
-import 'package:matcher/matcher.dart';
-import 'package:unittest/unittest.dart' show test, group;
-
-import 'test_utils.dart';
-
-void main() {
-  initUtils();
-
-  test('completes - unexpected error', () {
-    var completer = new Completer();
-    completer.completeError('X');
-    shouldFail(completer.future, completes, contains(
-        'Expected future to complete successfully, '
-        'but it failed with X'), isAsync: true);
-  });
-
-  test('completes - successfully', () {
-    var completer = new Completer();
-    completer.complete('1');
-    shouldPass(completer.future, completes, isAsync: true);
-  });
-
-  test('throws - unexpected to see normal completion', () {
-    var completer = new Completer();
-    completer.complete('1');
-    shouldFail(completer.future, throws,
-        contains("Expected future to fail, but succeeded with '1'"),
-        isAsync: true);
-  });
-
-  test('throws - expected to see exception', () {
-    var completer = new Completer();
-    completer.completeError('X');
-    shouldPass(completer.future, throws, isAsync: true);
-  });
-
-  test('throws - expected to see exception thrown later on', () {
-    var completer = new Completer();
-    var chained = completer.future.then((_) {
-      throw 'X';
-    });
-    shouldPass(chained, throws, isAsync: true);
-    completer.complete('1');
-  });
-
-  test('throwsA - unexpected normal completion', () {
-    var completer = new Completer();
-    completer.complete('1');
-    shouldFail(completer.future, throwsA(equals('X')),
-        contains("Expected future to fail, but succeeded with '1'"),
-        isAsync: true);
-  });
-
-  test('throwsA - correct error', () {
-    var completer = new Completer();
-    completer.completeError('X');
-    shouldPass(completer.future, throwsA(equals('X')), isAsync: true);
-  });
-
-  test('throwsA - wrong error', () {
-    var completer = new Completer();
-    completer.completeError('X');
-    shouldFail(completer.future, throwsA(equals('Y')),
-        "Expected: 'Y' Actual: 'X' "
-        "Which: is different. "
-        "Expected: Y Actual: X ^ Differ at offset 0", isAsync: true);
-  });
-}