anchor.diff:    _config.onStart();
   
     _defer(() {
  -    _testRunner();
  +    _nextBatch();
     });
   }
   
  
positive.code: 
  /** Get the list of tests. */
  List<TestCase> get testCases => _tests;
  
  /**
   * Callback used to run tests. Entrypoints can replace this with their own
   * if they want.
   */
  Function _testRunner;
  
  /** Setup function called before each test in a group */
  Function _testSetup;
  
negative.code: }
  
  /** Publish results on the page and notify controller. */
  void _completeTests() {
    if (!_initialized) return;
    int passed = 0;
    int failed = 0;
  