Add correct test for issue 23523

pkg/analyzer/test/generated/resolver_test.dart

 // Copyright (c) 2014, 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 engine.resolver_test;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 396 matching lines @@
 
 /**
  * Helper for creating and managing single [AnalysisContext].
  */
 class AnalysisContextHelper {
   AnalysisContext context;
 
   /**
    * Creates new [AnalysisContext] using [AnalysisContextFactory.contextWithCore].
    */
-  AnalysisContextHelper() {
-    context = AnalysisContextFactory.contextWithCore();
-    AnalysisOptionsImpl options =
-        new AnalysisOptionsImpl.from(context.analysisOptions);
+  AnalysisContextHelper([AnalysisOptionsImpl options]) {
+    if (options == null) {
+      options = new AnalysisOptionsImpl();
+    }
     options.cacheSize = 256;
-    context.analysisOptions = options;
+    context = AnalysisContextFactory.contextWithCoreAndOptions(options);
   }
 
   Source addSource(String path, String code) {
     Source source = new FileBasedSource(FileUtilities2.createFile(path));
     if (path.endsWith(".dart") || path.endsWith(".html")) {
       ChangeSet changeSet = new ChangeSet();
       changeSet.addedSource(source);
       context.applyChanges(changeSet);
     }
     context.setContents(source, code);
@@ skipping 13378 matching lines @@
         // check propagated type
         FunctionType propagatedType = node.propagatedType as FunctionType;
         expect(propagatedType.returnType, test.typeProvider.stringType);
       } on AnalysisException catch (e, stackTrace) {
         thrownException[0] = new CaughtException(e, stackTrace);
       }
     }
     return null;
   }
 }