Added the ability to get the names of the options in a set of parsed arguments, and the default val…

tests/lib/args/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('../../../lib/unittest/unittest.dart');
 #import('../../../lib/args/args.dart');
 
 main() {
@@ skipping 359 matching lines @@
         parser.addOption('define', allowMultiple: true);
         var args = parser.parse(['--define=1']);
         expect(args['define'], equals(['1']));
         args = parser.parse(['--define=1', '--define=2']);
         expect(args['define'], equals(['1','2']));
       });
 
       test('returns the default value for multi-valued arguments '
            'if not explicitly set', () {
         var parser = new ArgParser();
-        parser.addOption('define', defaultsTo:'0', allowMultiple: true);
+        parser.addOption('define', defaultsTo: '0', allowMultiple: true);
         var args = parser.parse(['']);
         expect(args['define'], equals(['0']));
       });
     });
 
+    group('query default values', () {
+      test('queries the default value', () {
+        var parser = new ArgParser();
+        parser.addOption('define', defaultsTo: '0');
+        expect(()=>parser.getDefault('undefine'),
+            throwsIllegalArgumentException);
+      });
+
+      test('queries the default value for an unknown option', () {
+        var parser = new ArgParser();
+        parser.addOption('define', defaultsTo: '0');
+        expect(()=>parser.getDefault('undefine'),
+            throwsIllegalArgumentException);
+      });
+    });
+
+    group('gets the option names from an ArgsResult', () {
+      test('queries the set options', () {
+        var parser = new ArgParser();
+        parser.addFlag('woof', defaultsTo: false);
+        parser.addOption('meow', defaultsTo: 'kitty');
+        var args = parser.parse([]);
+        expect(args.options, hasLength(2));
+        expect(args.options.some((o) => o == 'woof'), isTrue);
+        expect(args.options.some((o) => o == 'meow'), isTrue);
+      });
+    });
+
     group('remaining args', () {
       test('stops parsing args when a non-option-like arg is encountered', () {
         var parser = new ArgParser();
         parser.addFlag('woof');
         parser.addOption('meow');
         parser.addOption('tweet', defaultsTo: 'bird');
 
         var results = parser.parse(['--woof', '--meow', 'v', 'not', 'option']);
         expect(results['woof'], isTrue);
         expect(results['meow'], equals('v'));
@@ skipping 233 matching lines @@
         throw new IllegalArgumentException(
             'Line "$line" does not have enough indentation.');
       }
 
       lines[i] = line.substring(indent);
     }
   }
 
   return Strings.join(lines, '\n');
 }