anchor.diff:  
   library frame_test;
   
  +import 'dart:io';
   import 'dart:uri';
   
   import 'package:pathos/path.dart' as path;
  
positive.code:     });
  
      test('returns the relative path for file URIs', () {
        var absolute = path.absolute(path.join('foo', 'bar.dart'));
        expect(new Frame.parse('#0 Foo (file://$absolute:0:0)').library,
            equals(path.join('foo', 'bar.dart')));
      });
    });
  
negative.code:     });
    });
  }
  
  String _pathToFileUri(String pathString) {
    pathString = path.absolute(pathString);
    if (Platform.operatingSystem != 'windows') return 'file://$pathString';
    return 'file:///${pathString.replaceAll("\\", "/")}';
  }
  