anchor.diff:      DivElement areaHost = wrapper.querySelector('.chart-host');
       DivElement legendHost = wrapper.querySelector('.chart-legend-host');
   
  -    data ??= _placeholderData;
  +    data ??= _getPlaceholderData();
   
       ChartData chartData = new ChartData(_columnSpecs, data);
       ChartSeries series = new ChartSeries("Flutter Analysis Times", [1, 2], new LineChartRenderer());
  
positive.code: }
  
  Iterable _columnSpecs = [
  
    new ChartColumnSpec(
      label: 'Time',
      type: ChartColumnSpec.TYPE_TIMESTAMP
      // formatter: (num val) => val.toString() + ' sdf'
    ),
    new ChartColumnSpec(
      label: 'flutter analyze flutter-repo',
  
negative.code:   )
  ];
  
  Iterable _getPlaceholderData() {
    DateTime now = new DateTime.now();
  
    return [
      [now.subtract(new Duration(days: 30)).millisecondsSinceEpoch, 0.0, 0.0],
      [now.millisecondsSinceEpoch, 0.0, 0.0],
    ];
  }
  