Move allowTrailingOptions into ArgParser.

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';
-
-void main() {
-  group('ArgParser.parse(allowTrailingOptions: true) '
-        'starting with a non-option', () {
-    test('followed by flag', () {
-      var parser = new ArgParser()..addFlag('flag');
-      var args = ['A', '--flag'];
-
-      var resultsAll = parser.parse(args, allowTrailingOptions: true);
-      expect(resultsAll['flag'], isTrue);
-      expect(resultsAll.rest, equals(['A']));
-    });
-
-    test('followed by option', () {
-      var parser = new ArgParser()..addOption('opt');
-      var args = ['A', '--opt'];
-
-      expectThrows(parser, args);
-    });
-
-    test('followed by option and value', () {
-      var parser = new ArgParser()..addOption('opt');
-      var args = ['A', '--opt', 'V'];
-
-      var resultsAll = parser.parse(args, allowTrailingOptions: true);
-      expect(resultsAll['opt'], equals('V'));
-      expect(resultsAll.rest, equals(['A']));
-    });
-
-    test('followed by unknown flag', () {
-      var parser = new ArgParser();
-      var args = ['A', '--xflag'];
-
-      expectThrows(parser, args);
-    });
-
-    test('followed by unknown option and value', () {
-      var parser = new ArgParser();
-      var args = ['A', '--xopt', 'V'];
-
-      expectThrows(parser, args);
-    });
-
-    test('followed by command', () {
-      var parser = new ArgParser()..addCommand('com');
-      var args = ['A', 'com'];
-
-      expectThrows(parser, args);
-    });
-  });
-}
-
-void expectThrows(ArgParser parser, List<String> args) =>
-  expect(() => parser.parse(args, allowTrailingOptions: true),
-      throwsFormatException,
-      reason: "with allowTrailingOptions: true");