Add an ArgResults.original getter.

pkg/args/test/args_test.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.
 
 library args_test;
 
 import 'package:unittest/unittest.dart';
 import 'package:args/args.dart';
 import 'utils.dart';
 
@@ skipping 210 matching lines @@
     test('[] throws if the name is not an option', () {
       var results = new ArgParser().parse([]);
       throwsIllegalArg(() => results['unknown']);
     });
 
     test('rest cannot be modified', () {
       var results = new ArgParser().parse([]);
       expect(() => results.rest.add('oops'), throwsUnsupportedError);
     });
 
+    test('.arguments returns the original argument list', () {
+      var parser = new ArgParser();
+      parser.addFlag('foo');
+
+      var results = parser.parse(['--foo']);
+      expect(results.arguments, equals(['--foo']));
+    });
+
     group('.wasParsed()', () {
       test('throws if the name is not an option', () {
         var results = new ArgParser().parse([]);
         throwsIllegalArg(() => results.wasParsed('unknown'));
       });
 
       test('returns true for parsed options', () {
         var parser = new ArgParser();
         parser.addFlag('fast');
         parser.addFlag('verbose');
@@ skipping 51 matching lines @@
 const _VALID_OPTIONS = const [
  'a' // One character.
  'contains-dash',
  'contains_underscore',
  'ends-with-dash-',
  'contains--doubledash--',
  '1starts-with-number',
  'contains-a-1number',
  'ends-with-a-number8'
 ];