anchor.diff:      expect(element.name, 'myField');
       {
         plugin.Location location = element.location;
  -      expect(location.file, '/test.dart');
  +      expect(location.file, testFile);
         expect(location.offset, 25);
         expect(location.length, 'myField'.length);
         expect(location.startLine, 2);
  
positive.code:     expect(element.name, 'myLabel');
      {
        plugin.Location location = element.location;
        expect(location.file, '/test.dart');
        expect(location.offset, 9);
        expect(location.length, 'myLabel'.length);
        expect(location.startLine, 2);
  
negative.code:     expect(element.name, 'mySetter');
      {
        plugin.Location location = element.location;
        expect(location.file, testFile);
        expect(location.offset, 16);
        expect(location.length, 'mySetter'.length);
        expect(location.startLine, 2);
  