anchor.diff:  
     test_file_referenced_by_part() async {
       String pathA = '/home/test/000/1111/a.dart';
  -    testFile = '/home/test/000/1111/22/test.dart';
  +    testFile = context.normalize('/home/test/000/1111/22/test.dart');
       addSource(pathA, '''
   library lib;
   part '22/test.dart';
  
positive.code:     // rather than a library name, that will need updating too (if the relative
      // path to the parent changes).
      String pathA = '/home/test/000/1111/a.dart';
      testFile = '/home/test/000/1111/22/test.dart';
      addSource(pathA, '''
  library lib;
  part '22/test.dart';
  
negative.code: import 'package:analysis_server/src/protocol_server.dart';
  import 'package:analysis_server/src/services/correction/status.dart';
  import 'package:analysis_server/src/services/refactoring/refactoring.dart';
  import 'package:path/path.dart';
  import 'package:test/test.dart';
  import 'package:test_reflective_loader/test_reflective_loader.dart';
  
  