Use AbstractContextTest for AnalysisContextImplTest.

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/context.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart'
     hide AnalysisContextImpl, AnalysisTask;
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/plugin/engine_plugin.dart';
 import 'package:analyzer/src/task/driver.dart';
 import 'package:analyzer/src/task/manager.dart';
 import 'package:plugin/manager.dart';
 import 'package:unittest/unittest.dart';
 
 import 'mock_sdk.dart';
 
 class AbstractContextTest {
   MemoryResourceProvider resourceProvider = new MemoryResourceProvider();
 
   ExtensionManager extensionManager = new ExtensionManager();
 
   DartSdk sdk = new MockSdk();
+  SourceFactory sourceFactory;
   AnalysisContextImpl context;
 
   TaskManager taskManager = new TaskManager();
   AnalysisDriver analysisDriver;
 
+  Source addSource(String path, String contents) {
+    Source source = newSource(path, contents);
+    ChangeSet changeSet = new ChangeSet();
+    changeSet.addedSource(source);
+    context.applyChanges(changeSet);
+    context.setContents(source, contents);
+    return source;
+  }
+
   /**
    * Assert that the given [elements] has the same number of items as the number
    * of specified [names], and that for each specified name, a corresponding
    * element can be found in the given collection with that name.
    */
   void assertNamedElements(List<Element> elements, List<String> names) {
     for (String elemName in names) {
       bool found = false;
       for (Element elem in elements) {
         if (elem.name == elemName) {
@@ skipping 31 matching lines @@
       Source source = newSource(path, content);
       sources.add(source);
     });
     return sources;
   }
 
   void setUp() {
     // configure TaskManager
     {
       EnginePlugin plugin = AnalysisEngine.instance.enginePlugin;
-      extensionManager.processPlugins([plugin]);
+      if (plugin.taskExtensionPoint == null) {
+        extensionManager.processPlugins([plugin]);
+      }
       taskManager.addTaskDescriptors(plugin.taskDescriptors);
     }
     // prepare AnalysisContext
-    context = createAnalysisContext();
-    context.sourceFactory = new SourceFactory(<UriResolver>[
+    sourceFactory = new SourceFactory(<UriResolver>[
       new DartUriResolver(sdk),
       new ResourceUriResolver(resourceProvider)
     ]);
+    context = createAnalysisContext();
+    context.sourceFactory = sourceFactory;
     // prepare AnalysisDriver
     analysisDriver = new AnalysisDriver(taskManager, context);
   }
 
   void tearDown() {}
 }