CLI support for `enableConditionalDirectives`.

pkg/analyzer_cli/test/options_test.dart

 // Copyright (c) 2015, 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_cli.test.options;
 
 import 'dart:io';
 
 import 'package:analyzer_cli/src/driver.dart';
 import 'package:analyzer_cli/src/options.dart';
 import 'package:args/args.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 import 'package:unittest/unittest.dart';
 
 main() {
   group('CommandLineOptions', () {
     group('parse', () {
       test('defaults', () {
         CommandLineOptions options =
             CommandLineOptions.parse(['--dart-sdk', '.', 'foo.dart']);
         expect(options, isNotNull);
         expect(options.dartSdkPath, isNotNull);
         expect(options.disableHints, isFalse);
         expect(options.lints, isFalse);
         expect(options.displayVersion, isFalse);
         expect(options.enableStrictCallChecks, isFalse);
         expect(options.enableSuperMixins, isFalse);
+        expect(options.enableConditionalDirectives, isFalse);

[Brian Wilkerson, 2016/03/09 03:31:10]

Maybe a test showing that it's true when the flag is included?

[pquitslund, 2016/03/09 18:04:31]

Done.

         expect(options.enableTypeChecks, isFalse);
         expect(options.hintsAreFatal, isFalse);
         expect(options.ignoreUnrecognizedFlags, isFalse);
         expect(options.log, isFalse);
         expect(options.machineFormat, isFalse);
         expect(options.packageMode, isFalse);
         expect(options.packageRootPath, isNull);
         expect(options.packageSummaryInputs, isEmpty);
         expect(options.shouldBatch, isFalse);
         expect(options.showPackageWarnings, isFalse);
@@ skipping 230 matching lines @@
       '/path/to/pkg'
     ]);
     expect(options.packageMode, isTrue);
     expect(options.packageSummaryOutput, '/path/to/output.sum');
   }
 
   void _parse(List<String> args) {
     options = CommandLineOptions.parse(args);
   }
 }