DDC/AnalyzerCLI common cmdline option processing

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';
@@ skipping 37 matching lines @@
       });
 
       test('batch', () {
         CommandLineOptions options =
             CommandLineOptions.parse(['--dart-sdk', '.', '--batch']);
         expect(options.shouldBatch, isTrue);
       });
 
       test('defined variables', () {
         CommandLineOptions options = CommandLineOptions
-            .parse(['--dart-sdk', '.', '-Dfoo=bar', '-Da', 'b', 'foo.dart']);
+            .parse(['--dart-sdk', '.', '-Dfoo=bar', 'foo.dart']);
         expect(options.definedVariables['foo'], equals('bar'));
         expect(options.definedVariables['bar'], isNull);
-        expect(options.definedVariables['a'], equals('b'));
-        expect(options.definedVariables['b'], isNull);
       });
 
       test('disable cache flushing', () {
         CommandLineOptions options = CommandLineOptions
             .parse(['--dart-sdk', '.', '--disable-cache-flushing', 'foo.dart']);
         expect(options.disableCacheFlushing, isTrue);
       });
 
       test('enable strict call checks', () {
         CommandLineOptions options = CommandLineOptions.parse(
@@ skipping 262 matching lines @@
       'package:p/foo.dart|/path/to/p/lib/foo.dart'
     ]);
     expect(options.buildMode, isTrue);
     expect(options.buildSuppressExitCode, isTrue);
   }
 
   void _parse(List<String> args) {
     options = CommandLineOptions.parse(args);
   }
 }