Add an option to run skipped tests.

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 38 matching lines @@
       help: 'Run only tests with all of the specified tags.\n'
           'Supports boolean selector syntax.',
       allowMultiple: true);
   parser.addOption("tag", hide: true, allowMultiple: true);
   parser.addOption("exclude-tags",
       abbr: 'x',
       help: "Don't run tests with any of the specified tags.\n"
           "Supports boolean selector syntax.",
       allowMultiple: true);
   parser.addOption("exclude-tag", hide: true, allowMultiple: true);
+  parser.addFlag("run-skipped",
+      help: 'Run skipped tests instead of skipping them.');
 
   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',
@@ skipping 127 matching lines @@
         precompiledPath: _ifParsed('precompiled'),
         reporter: _ifParsed('reporter'),
         pubServePort: _parseOption('pub-serve', int.parse),
         concurrency: _parseOption('concurrency', int.parse),
         shardIndex: shardIndex,
         totalShards: totalShards,
         timeout: _parseOption('timeout', (value) => new Timeout.parse(value)),
         patterns: patterns,
         platforms: (_ifParsed('platform') as List<String>)
             ?.map(TestPlatform.find),
+        runSkipped: _ifParsed('run-skipped'),
         chosenPresets: _ifParsed('preset') as List<String>,
         paths: _options.rest.isEmpty ? null : _options.rest,
         includeTags: includeTags,
         excludeTags: excludeTags);
   }
 
   /// Returns the parsed option for [name], or `null` if none was parsed.
   ///
   /// If the user hasn't explicitly chosen a value, we want to pass null values
   /// to [new Configuration] so that it considers those fields unset when
@@ skipping 15 matching lines @@
   /// information.
   /*=T*/ _wrapFormatException/*<T>*/(String name, /*=T*/ parse()) {
     try {
       return parse();
     } on FormatException catch (error) {
       throw new FormatException('Couldn\'t parse --$name "${_options[name]}": '
           '${error.message}');
     }
   }
 }