Added new style of tests for parser.

pkg/args/test/parse_all_test.dart

+// Copyright (c) 2013, 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 parse_all_test;
+
+import 'package:unittest/unittest.dart';
+import 'package:args/args.dart';
+
+main() {
+  group('ArgParser.parse() starting with a non-option', () {
+    test('followed by flag', () {
+      var parser = new ArgParser()..addFlag('flag');
+      var args = ['A', '--flag'];
+
+      var results = parser.parse(args);
+      expect(results['flag'], isFalse);
+      expect(results.rest, orderedEquals(args));
+    });
+
+    test('followed by option', () {
+      var parser = new ArgParser()..addOption('opt');
+      var args = ['A', '--opt'];
+
+      var results = parser.parse(args);
+      expect(results['opt'], isNull);
+      expect(results.rest, orderedEquals(args));
+    });
+
+    test('followed by option and value', () {
+      var parser = new ArgParser()..addOption('opt');
+      var args = ['A', '--opt', 'V'];
+
+      var results = parser.parse(args);
+      expect(results['opt'], isNull);
+      expect(results.rest, orderedEquals(args));
+    });
+
+    test('followed by unknown flag', () {
+      var parser = new ArgParser();
+      var args = ['A', '--xflag'];
+      var results = parser.parse(args);
+      expect(results.rest, orderedEquals(args));
+    });
+
+    test('followed by unknown option and value', () {
+      var parser = new ArgParser();
+      var args = ['A', '--xopt', 'V'];
+      var results = parser.parse(args);
+      expect(results.rest, orderedEquals(args));
+    });
+
+    test('followed by command', () {
+      var parser = new ArgParser()..addCommand('com');
+      var args = ['A', 'com'];
+
+      var results = parser.parse(args);
+      expect(results.command, isNull);
+      expect(results.rest, orderedEquals(args));
+    });
+  });
+}