anchor.diff:        expect(new Frame.parse('#0 Foo '
                 '(http://dartlang.org/thing.dart:5:10)').location,
             equals('http://dartlang.org/thing.dart 5:10'));
  -      var absolute = path.absolute(path.join('foo', 'bar.dart'));
  -      expect(new Frame.parse('#0 Foo (file://$absolute:1:2)').location,
  +      var uri = _pathToFileUri(path.join('foo', 'bar.dart'));
  +      expect(new Frame.parse('#0 Foo ($uri:1:2)').location,
             equals('${path.join('foo', 'bar.dart')} 1:2'));
       });
   
  
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: 
  library frame_test;
  
  import 'dart:io';
  import 'dart:uri';
  
  import 'package:pathos/path.dart' as path;
  