format code, removed unused variables and deprecated usage

example/test_runner.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.
 
 /// This is an example of converting the args in test.dart to use this API.
 /// It shows what it looks like to build an [ArgParser] and then, when the code
 /// is run, demonstrates what the generated usage text looks like.
 library example;
 
 import 'dart:io';
 
 import 'package:args/args.dart';
 
 main() {
   var parser = new ArgParser();
 
-  parser.addOption('mode', abbr: 'm', defaultsTo: 'debug',
+  parser.addOption('mode',
+      abbr: 'm',
+      defaultsTo: 'debug',
       help: 'Mode in which to run the tests',
       allowed: ['all', 'debug', 'release']);
 
-  parser.addOption('compiler', abbr: 'c', defaultsTo: 'none',
+  parser.addOption('compiler',
+      abbr: 'c',
+      defaultsTo: 'none',
       help: 'Specify any compilation step (if needed).',
       allowed: ['none', 'dart2js', 'dartc'],
       allowedHelp: {
-        'none': 'Do not compile the Dart code (run native Dart code on the'
-          ' VM).\n(only valid with the following runtimes: vm, drt)',
-        'dart2js': 'Compile dart code to JavaScript by running dart2js.\n'
-          '(only valid with the following runtimes: d8, drt, chrome\n'
-          'safari, ie, firefox, opera, none (compile only))',
-        'dartc': 'Perform static analysis on Dart code by running dartc.\n'
-          '(only valid with the following runtimes: none)',
-      });
+    'none': 'Do not compile the Dart code (run native Dart code on the'
+        ' VM).\n(only valid with the following runtimes: vm, drt)',
+    'dart2js': 'Compile dart code to JavaScript by running dart2js.\n'
+        '(only valid with the following runtimes: d8, drt, chrome\n'
+        'safari, ie, firefox, opera, none (compile only))',
+    'dartc': 'Perform static analysis on Dart code by running dartc.\n'
+        '(only valid with the following runtimes: none)',
+  });
 
-  parser.addOption('runtime', abbr: 'r', defaultsTo: 'vm',
+  parser.addOption('runtime',
+      abbr: 'r',
+      defaultsTo: 'vm',
       help: 'Where the tests should be run.',
-      allowed: ['vm', 'd8', 'drt', 'dartium', 'ff', 'firefox', 'chrome',
-              'safari', 'ie', 'opera', 'none'],
+      allowed: [
+    'vm',
+    'd8',
+    'drt',
+    'dartium',
+    'ff',
+    'firefox',
+    'chrome',
+    'safari',
+    'ie',
+    'opera',
+    'none'
+  ],
       allowedHelp: {
-        'vm': 'Run Dart code on the standalone dart vm.',
-        'd8': 'Run JavaScript from the command line using v8.',
-        // TODO(antonm): rename flag.
-        'drt': 'Run Dart or JavaScript in the headless version of Chrome,\n'
-          'content shell.',
-        'dartium': 'Run Dart or JavaScript in Dartium.',
-        'ff': 'Run JavaScript in Firefox',
-        'chrome': 'Run JavaScript in Chrome',
-        'safari': 'Run JavaScript in Safari',
-        'ie': 'Run JavaScript in Internet Explorer',
-        'opera': 'Run JavaScript in Opera',
-        'none': 'No runtime, compile only (for example, used for dartc static\n'
-          'analysis tests).',
-      });
+    'vm': 'Run Dart code on the standalone dart vm.',
+    'd8': 'Run JavaScript from the command line using v8.',
+    // TODO(antonm): rename flag.
+    'drt': 'Run Dart or JavaScript in the headless version of Chrome,\n'
+        'content shell.',
+    'dartium': 'Run Dart or JavaScript in Dartium.',
+    'ff': 'Run JavaScript in Firefox',
+    'chrome': 'Run JavaScript in Chrome',
+    'safari': 'Run JavaScript in Safari',
+    'ie': 'Run JavaScript in Internet Explorer',
+    'opera': 'Run JavaScript in Opera',
+    'none': 'No runtime, compile only (for example, used for dartc static\n'
+        'analysis tests).',
+  });
 
-  parser.addOption('arch', abbr: 'a', defaultsTo: 'ia32',
+  parser.addOption('arch',
+      abbr: 'a',
+      defaultsTo: 'ia32',
       help: 'The architecture to run tests for',
       allowed: ['all', 'ia32', 'x64', 'simarm']);
 
-  parser.addOption('system', abbr: 's', defaultsTo: Platform.operatingSystem,
+  parser.addOption('system',
+      abbr: 's',
+      defaultsTo: Platform.operatingSystem,
       help: 'The operating system to run tests on',
       allowed: ['linux', 'macos', 'windows']);
 
-  parser.addFlag('checked', defaultsTo: false,
-      help: 'Run tests in checked mode');
+  parser.addFlag('checked',
+      defaultsTo: false, help: 'Run tests in checked mode');
 
-  parser.addFlag('host-checked', defaultsTo: false,
-      help: 'Run compiler in checked mode');
+  parser.addFlag('host-checked',
+      defaultsTo: false, help: 'Run compiler in checked mode');
 
-  parser.addOption('timeout', abbr: 't',
-      help: 'Timeout in seconds');
+  parser.addOption('timeout', abbr: 't', help: 'Timeout in seconds');
 
-  parser.addOption('progress', abbr: 'p', defaultsTo: 'compact',
+  parser.addOption('progress',
+      abbr: 'p',
+      defaultsTo: 'compact',
       help: 'Progress indication mode',
-      allowed: ['compact', 'color', 'line', 'verbose', 'silent', 'status',
-                'buildbot']);
+      allowed: [
+    'compact',
+    'color',
+    'line',
+    'verbose',
+    'silent',
+    'status',
+    'buildbot'
+  ]);
 
-  parser.addFlag('report', defaultsTo: false,
+  parser.addFlag('report',
+      defaultsTo: false,
       help: 'Print a summary report of the number of tests, by expectation');
 
-  parser.addOption('tasks', abbr: 'j',
+  parser.addOption('tasks',
+      abbr: 'j',
       defaultsTo: Platform.numberOfProcessors.toString(),
       help: 'The number of parallel tasks to run');
 
-  parser.addOption('shards', defaultsTo: '1',
+  parser.addOption('shards',
+      defaultsTo: '1',
       help: 'The number of instances that the tests will be sharded over');
 
-  parser.addOption('shard', defaultsTo: '1',
+  parser.addOption('shard',
+      defaultsTo: '1',
       help: 'The index of this instance when running in sharded mode');
 
-  parser.addFlag('verbose', abbr: 'v', defaultsTo: false,
-      help: 'Verbose output');
+  parser.addFlag('verbose',
+      abbr: 'v', defaultsTo: false, help: 'Verbose output');
 
-  parser.addFlag('list', defaultsTo: false,
-      help: 'List tests only, do not run them');
+  parser.addFlag('list',
+      defaultsTo: false, help: 'List tests only, do not run them');
 
-  parser.addFlag('keep-generated-tests', defaultsTo: false,
+  parser.addFlag('keep-generated-tests',
+      defaultsTo: false,
       help: 'Keep the generated files in the temporary directory');
 
-  parser.addFlag('valgrind', defaultsTo: false,
-      help: 'Run tests through valgrind');
+  parser.addFlag('valgrind',
+      defaultsTo: false, help: 'Run tests through valgrind');
 
-  parser.addOption('special-command',
-      help: """
+  parser.addOption('special-command', help: """
 Special command support. Wraps the command line in
 a special command. The special command should contain
 an '@' character which will be replaced by the normal
 command.
 
 For example if the normal command that will be executed
 is 'dart file.dart' and you specify special command
 'python -u valgrind.py @ suffix' the final command will be
 'python -u valgrind.py dart file.dart suffix'""");
 
   parser.addFlag('time',
-      help: 'Print timing information after running tests',
-      defaultsTo: false);
+      help: 'Print timing information after running tests', defaultsTo: false);
 
-  parser.addOption('dart',    help: 'Path to dart executable');
-  parser.addOption('drt',     help: 'Path to content shell executable');
+  parser.addOption('dart', help: 'Path to dart executable');
+  parser.addOption('drt', help: 'Path to content shell executable');
   parser.addOption('dartium', help: 'Path to Dartium Chrome executable');
 
-  parser.addFlag('batch', abbr: 'b',
-      help: 'Run browser tests in batch mode',
-      defaultsTo: true);
+  parser.addFlag('batch',
+      abbr: 'b', help: 'Run browser tests in batch mode', defaultsTo: true);
 
-  print(parser.getUsage());
+  print(parser.usage);
 }