Re-apply "Remove unittest and matcher from the repo."

pkg/unittest/test/with_test_environment_test.dart

-// Copyright (c) 2014, 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.with_test_environment_test;
-
-import 'dart:async';
-import 'package:unittest/unittest.dart';
-
-class TestConfiguration extends SimpleConfiguration {
-  final Completer _completer = new Completer();
-  List<TestCase> _results;
-
-  TestConfiguration();
-
-  void onSummary(int passed, int failed, int errors, List<TestCase> results,
-                 String uncaughtError) {
-    super.onSummary(passed, failed, errors, results, uncaughtError);
-    _results = results;
-  }
-
-  Future get done => _completer.future;
-
-  onDone(success) {
-    new Future.sync(() => super.onDone(success))
-        .then(_completer.complete)
-        .catchError(_completer.completeError);
-  }
-
-  bool checkIfTestRan(String testName) {
-    return _results.any((test) => test.description == testName);
-  }
-}
-
-Future runUnittests(Function callback) {
-  TestConfiguration config = unittestConfiguration = new TestConfiguration();
-  callback();
-
-  return config.done;
-}
-
-void runTests() {
-  test('test', () => expect(2 + 3, equals(5)));
-}
-
-void runTests1() {
-  test('test1', () => expect(4 + 3, equals(7)));
-}
-
-// Test that we can run two different sets of tests in the same run using the
-// withTestEnvironment method.
-void main() {
-  // Check that setting config a second time does not change the configuration
-  runUnittests(runTests);
-  var config = unittestConfiguration;
-  runUnittests(runTests1);
-  expect(config, unittestConfiguration);
-
-  // Test that we can run both when encapsulating in their own private test
-  // environment. Also test that the tests actually running are the ones
-  // scheduled in the runTests/runTests1 methods.
-  withTestEnvironment(() {
-    runUnittests(runTests).whenComplete(() {
-      TestConfiguration config = unittestConfiguration;
-      expect(config.checkIfTestRan('test'), true);
-      expect(config.checkIfTestRan('test1'), false);
-    });
-  });
-  withTestEnvironment(() {
-    runUnittests(runTests1).whenComplete(() {
-      TestConfiguration config = unittestConfiguration;
-      expect(config.checkIfTestRan('test'), false);
-      expect(config.checkIfTestRan('test1'), true);
-    });
-  });
-
-  // Third test that we can run with two nested test environments.
-  withTestEnvironment(() {
-    runUnittests(runTests);
-    withTestEnvironment(() {
-      runUnittests(runTests1);
-    });
-  });
-}