Move DartWorkManager notification to _sourceChanged().

pkg/analyzer/test/src/context/context_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 test.src.context.context_test;
 
 import 'dart:async';
 
 import 'package:analyzer/src/cancelable_future.dart';
 import 'package:analyzer/src/context/cache.dart';
@@ skipping 1646 matching lines @@
   void test_getStatistics() {
     AnalysisContextStatistics statistics = context.statistics;
     expect(statistics, isNotNull);
     // The following lines are fragile.
     // The values depend on the number of libraries in the SDK.
 //    assertLength(0, statistics.getCacheRows());
 //    assertLength(0, statistics.getExceptions());
 //    assertLength(0, statistics.getSources());
   }
 
+  void test_handleContentsChanged() {
+    ContentCache contentCache = new ContentCache();
+    context.contentCache = contentCache;
+    String oldContents = 'foo() {}';
+    String newContents = 'bar() {}';
+    // old contents
+    Source source = addSource("/test.dart", oldContents);
+    _analyzeAll_assertFinished();
+    expect(context.getResolvedCompilationUnit2(source, source), isNotNull);
+    // new contents
+    contentCache.setContents(source, newContents);
+    context.handleContentsChanged(source, oldContents, newContents, true);
+    // there is some work to do
+    AnalysisResult analysisResult = context.performAnalysisTask();
+    expect(analysisResult.changeNotices, isNotNull);
+  }
+
   void test_isClientLibrary_dart() {
     Source source = addSource("/test.dart", r'''
 import 'dart:html';
 
 main() {}''');
     expect(context.isClientLibrary(source), isFalse);
     expect(context.isServerLibrary(source), isFalse);
     context.computeLibraryElement(source);
     expect(context.isClientLibrary(source), isTrue);
     expect(context.isServerLibrary(source), isFalse);
@@ skipping 435 matching lines @@
       : super(name, UriKind.FILE_URI);
 
   @override
   TimestampedData<String> get contents {
     throw 'Read error';
   }
 
   @override
   bool exists() => true;
 }