anchor.diff:    bool _printSummary;
     var _formatter;
     var _failureSummary = <String>[];
  +  var _failedTests= 0;
   
     TestFailurePrinter(this._printSummary,
                        [this._formatter = const Formatter()]);
   
     void done(TestCase test) {
       if (test.lastCommandOutput.unexpectedOutput) {
  +      _failedTests++;
         var lines = _buildFailureOutput(test, _formatter);
         for (var line in lines) {
           print(line);
  
positive.code:           print(line);
          }
          print('');
        }
      }
    }
  
negative.code:       }
        print('');
      }
      print(_buildSummaryEnd(_failedTests));
    }
  }
  