anchor.diff:    wrapAsync = (f, [id]) => expectAsync1(f, id: id);
   
     _tests = <TestCase>[];
  -  _testRunner = _nextBatch;
     _uncaughtErrorMessage = null;
   
     if (_config == null) {
  
positive.code: void _nextTestCase() {
    _defer(() {
      _currentTest++;
      _testRunner();
    });
  }
  
  
negative.code: 
  /** Get the list of tests. */
  List<TestCase> get testCases => _tests;
  
  /** Setup function called before each test in a group */
  Function _testSetup;
  