anchor.diff:  void _nextTestCase() {
     _defer(() {
       _currentTest++;
  -    _testRunner();
  +    _nextBatch();
     });
   }
   
  
positive.code:   _config.onStart();
  
    _defer(() {
      _testRunner();
    });
  }
  
  
negative.code: /**
   * Registers that an exception was caught for the current test.
   */
  void _registerException(testNum, e, [trace]) {
    trace = trace == null ? '' : trace.toString();
    String message = (e is TestFailure) ? e.message : 'Caught $e';
    if (_tests[testNum].result == null) {
  