refactor DDC to support --ignore-unrecognized-flags

pkg/analyzer/test/src/command_line/command_line_parser_test.dart

-// Copyright (c) 2016, 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 analyzer.test.src.command_line.command_line_parser_test;
-
-import 'package:analyzer/src/command_line/command_line_parser.dart';
-import 'package:args/args.dart';
-import 'package:test/test.dart';
-import 'package:test_reflective_loader/test_reflective_loader.dart';
-
-main() {
-  defineReflectiveSuite(() {
-    defineReflectiveTests(CommandLineParserTest);
-  });
-}
-
-@reflectiveTest
-class CommandLineParserTest {
-  void test_usage() {
-    CommandLineParser parser = new CommandLineParser();
-    parser.addOption('bar');
-    String usage = parser.parser.usage;
-    expect(usage, contains('--bar'));
-    expect(usage, contains(CommandLineParser.IGNORE_UNRECOGNIZED_FLAG));
-  }
-
-  void test_unrecognizedFlags1() {
-    CommandLineParser parser = new CommandLineParser();
-    expect(() {
-      return parser.parse(['--bar', '--baz', 'foo.dart']);
-    }, throwsA(new isInstanceOf<FormatException>()));
-  }
-
-  void test_unrecognizedFlags2() {
-    CommandLineParser parser = new CommandLineParser();
-    parser.addFlag('bar');
-    expect(() {
-      return parser.parse(['--bar', '--baz', 'foo.dart']);
-    }, throwsA(new isInstanceOf<FormatException>()));
-  }
-
-  void test_unrecognizedFlags_ignore() {
-    CommandLineParser parser =
-        new CommandLineParser(alwaysIgnoreUnrecognized: true);
-    parser.addOption('optA');
-    parser.addOption('optB');
-    parser.addOption('optG');
-    parser.addFlag('flagA');
-    ArgResults argResults = parser.parse([
-      '--optA=1',
-      '--optB',
-      '2',
-      '--optC=3',
-      '--flagA',
-      '--optD',
-      '4',
-      '5',
-      '--optG=9',
-      '--optH=10'
-    ]);
-    expect(argResults['optA'], '1');
-    expect(argResults['optB'], '2');
-    expect(argResults['optG'], '9');
-    expect(argResults['flagA'], isTrue);
-    expect(() {
-      return argResults['optC'];
-    }, throwsA(new isInstanceOf<ArgumentError>()));
-    expect(() {
-      return argResults['optD'];
-    }, throwsA(new isInstanceOf<ArgumentError>()));
-    expect(argResults.rest, orderedEquals(<String>['4', '5']));
-  }
-}