anchor.diff:  
   String _scriptDir() =>
       p.dirname(currentMirrorSystem().findLibrary(#compare_to_golden).uri.path);
  +
  +final _formatter = new DartFormatter();
  
positive.code: import 'dart:io';
  import 'dart:mirrors';
  
  import 'package:path/path.dart' as p;
  import 'package:test/test.dart';
  
  
negative.code:   var input = getFile(dartFileName, summaryExtension);
    var golden = getFile(dartFileName, goldenExtension);
  
    final formattedInput = _formatter.format(await input.readAsString());
    final formattedGolden = _formatter.format(await golden.readAsString());
    expect(formattedInput, formattedGolden);
  }
  
  File getFile(String dartFileName, String extension) =>
  