fix dartanalyzer sdk setup

pkg/analyzer_cli/test/driver_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.driver;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:analyzer/error/error.dart';
@@ skipping 304 matching lines @@
             path.join(testDir, '_packages'),
           ],
           options: path.join(testDir, '.analysis_options'),
         );
         expect(exitCode, 3);
         expect(outSink.toString(),
             contains('but doesn\'t end with a return statement.'));
         expect(outSink.toString(), contains('isn\'t defined'));
         expect(outSink.toString(), contains('Avoid empty else statements.'));
       });
+
+      test('test strong SDK', () async {
+        String testDir = path.join(testDirectory, 'data', 'strong_sdk');
+        await drive(path.join(testDir, 'main.dart'), args: ['--strong']);
+        expect(driver.context.analysisOptions.strongMode, isTrue);
+        expect(outSink.toString(), contains('No issues found'));
+        expect(exitCode, 0);
+      });
     });
 
     void createTests(String designator, String optionsFileName) {
       group('build-mode - $designator', () {
         // Shared driver command.
         Future<Null> doDrive(String filePath,
             {List<String> additionalArgs: const []}) async {
           await drive('file:///test_file.dart|$filePath',
               args: [
                 '--dart-sdk',
@@ skipping 184 matching lines @@
 
 ErrorProcessor processorFor(AnalysisError error) =>
     processors.firstWhere((p) => p.appliesTo(error));
 
 class TestSource implements Source {
   TestSource();
 
   @override
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }