Fix for the test.

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 1568 matching lines @@
   }
 
   void test_performAnalysisTask_IOException() {
     TestSource source = _addSourceWithException2("/test.dart", "library test;");
     source.generateExceptionOnRead = false;
     _analyzeAll_assertFinished();
     expect(source.readCount, 1);
     _changeSource(source, "");
     source.generateExceptionOnRead = true;
     _analyzeAll_assertFinished();
-    expect(source.readCount, 5);
+    if (AnalysisEngine.instance.limitInvalidationInTaskModel) {
+      expect(source.readCount, 5);
+    } else {
+      expect(source.readCount, 3);
+    }
   }
 
   void test_performAnalysisTask_missingPart() {
     Source source =
         addSource("/test.dart", "library lib; part 'no-such-file.dart';");
     _analyzeAll_assertFinished();
     expect(context.getLibraryElement(source), isNotNull,
         reason: "performAnalysisTask failed to compute an element model");
   }
 
@@ skipping 666 matching lines @@
   }
 }
 
 class _AnalysisContextImplTest_test_applyChanges_removeContainer
     implements SourceContainer {
   Source libB;
   _AnalysisContextImplTest_test_applyChanges_removeContainer(this.libB);
   @override
   bool contains(Source source) => source == libB;
 }