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

pkg/unittest/lib/vm_config.dart

-// 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.
-
-/// A simple unit test library for running tests on the VM.
-library unittest.vm_config;
-
-import 'dart:async';
-import 'dart:io';
-import 'unittest.dart';
-
-class VMConfiguration extends SimpleConfiguration {
-  // Color constants used for generating messages.
-  final String GREEN_COLOR = '\u001b[32m';
-  final String RED_COLOR = '\u001b[31m';
-  final String MAGENTA_COLOR = '\u001b[35m';
-  final String NO_COLOR = '\u001b[0m';
-
-  // We make this public so the user can turn it off if they want.
-  bool useColor;
-
-  VMConfiguration()
-      : super(),
-        useColor = stdioType(stdout) == StdioType.TERMINAL;
-
-  String formatResult(TestCase testCase) {
-    String result = super.formatResult(testCase);
-    if (useColor) {
-      if (testCase.result == PASS) {
-        return "${GREEN_COLOR}${result}${NO_COLOR}";
-      } else if (testCase.result == FAIL) {
-        return "${RED_COLOR}${result}${NO_COLOR}";
-      } else if (testCase.result == ERROR) {
-        return "${MAGENTA_COLOR}${result}${NO_COLOR}";
-      }
-    }
-    return result;
-  }
-
-  void onInit() {
-    super.onInit();
-    filterStacks = formatStacks = true;
-  }
-
-  void onDone(bool success) {
-    int status;
-    try {
-      super.onDone(success);
-      status = 0;
-    } catch (ex) {
-      // A non-zero exit code is used by the test infrastructure to detect
-      // failure.
-      status = 1;
-    }
-    Future.wait([stdout.close(), stderr.close()]).then((_) {
-      exit(status);
-    });
-  }
-}
-
-void useVMConfiguration() {
-  unittestConfiguration = _singleton;
-}
-
-final _singleton = new VMConfiguration();