Reuse CompilationUnitElement in BuildCompilationUnitElementTask.

pkg/analyzer/test/src/context/abstract_context.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 test.src.task.abstract_context_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
+import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart'
-    hide AnalysisContextImpl, AnalysisTask;
+    hide AnalysisCache, AnalysisContextImpl, AnalysisTask;
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/driver.dart';
 import 'package:unittest/unittest.dart';
 
 import 'mock_sdk.dart';
 
 class AbstractContextTest {
   MemoryResourceProvider resourceProvider = new MemoryResourceProvider();
 
   DartSdk sdk = new MockSdk();
   SourceFactory sourceFactory;
   AnalysisContextImpl context;
+  AnalysisCache analysisCache;
   AnalysisDriver analysisDriver;
 
   Source addSource(String path, String contents) {
     Source source = newSource(path, contents);
     ChangeSet changeSet = new ChangeSet();
     changeSet.addedSource(source);
     context.applyChanges(changeSet);
     return source;
   }
 
@@ skipping 45 matching lines @@
   }
 
   void setUp() {
     // prepare AnalysisContext
     sourceFactory = new SourceFactory(<UriResolver>[
       new DartUriResolver(sdk),
       new ResourceUriResolver(resourceProvider)
     ]);
     context = createAnalysisContext();
     context.sourceFactory = sourceFactory;
+    analysisCache = context.analysisCache;
     analysisDriver = context.driver;
   }
 
   void tearDown() {}
 }