Add support for configuration presets.

lib/src/runner/configuration/args.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:boolean_selector/boolean_selector.dart';
 
 import '../../backend/test_platform.dart';
@@ skipping 42 matching lines @@
       allowMultiple: true);
   parser.addOption("exclude-tag", hide: true, allowMultiple: true);
 
   parser.addSeparator("======== Running Tests");
   parser.addOption("platform",
       abbr: 'p',
       help: 'The platform(s) on which to run the tests.',
       defaultsTo: 'vm',
       allowed: allPlatforms.map((platform) => platform.identifier).toList(),
       allowMultiple: true);
+  parser.addOption("preset",
+      abbr: 'P',
+      help: 'The configuration preset(s) to use.',
+      allowMultiple: true);
   parser.addOption("concurrency",
       abbr: 'j',
       help: 'The number of concurrent test suites run.',
       defaultsTo: defaultConcurrency.toString(),
       valueHelp: 'threads');
   parser.addOption("pub-serve",
       help: 'The port of a pub serve instance serving "test/".',
       valueHelp: 'port');
   parser.addOption("timeout",
       help: 'The default test timeout. For example: 15s, 2x, none',
@@ skipping 76 matching lines @@
       pauseAfterLoad: ifParsed('pause-after-load'),
       color: ifParsed('color'),
       packageRoot: ifParsed('package-root'),
       reporter: ifParsed('reporter'),
       pubServePort: _wrapFormatException(options, 'pub-serve', int.parse),
       concurrency: _wrapFormatException(options, 'concurrency', int.parse),
       timeout: _wrapFormatException(options, 'timeout',
           (value) => new Timeout.parse(value)),
       pattern: pattern,
       platforms: ifParsed('platform')?.map(TestPlatform.find),
+      chosenPresets: ifParsed('preset'),
       paths: options.rest.isEmpty ? null : options.rest,
       includeTags: includeTags,
       excludeTags: excludeTags);
 }
 
 /// Runs [parse] on the value of the option [name], and wraps any
 /// [FormatException] it throws with additional information.
 _wrapFormatException(ArgResults options, String name, parse(value)) {
   if (!options.wasParsed(name)) return null;
 
   var value = options[name];
   if (value == null) return null;
 
   try {
     return parse(value);
   } on FormatException catch (error) {
     throw new FormatException('Couldn\'t parse --$name "${options[name]}": '
         '${error.message}');
   }
 }