anchor.diff:      super.tearDown();
       analysisDomain = null;
       completionDomain = null;
  +    AnalysisEngine.instance.useTaskModel = wasTaskModelEnabled;
     }
   
     /**
  
positive.code:   @override
    void setUp() {
      super.setUp();
      createProject();
      analysisDomain = handler;
      completionDomain = new Test_CompletionDomainHandler(server);
  
negative.code:   int requestCount = 0;
    String testFile2 = '/project/bin/test2.dart';
  
    /// Cached model state in case tests need to set task model to on/off.
    bool wasTaskModelEnabled;
  
    AnalysisServer createAnalysisServer(Index index) {
      ExtensionManager manager = new ExtensionManager();
      ServerPlugin serverPlugin = new ServerPlugin();
  