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:     // a library, so only one of them is updated.
      String pathA = '/home/test/000/1111/a.dart';
      String pathB = '/home/test/000/b.dart';
      testFile = '/home/test/000/1111/22/test.dart';
      addSource(pathA, '''
  library lib;
  part '22/test.dart';
  
negative.code: 
    test_file_importedLibrary_up() async {
      String pathA = '/home/test/000/1111/a.dart';
      testFile = context.normalize('/home/test/000/1111/22/test.dart');
      addSource(pathA, '''
  import '22/test.dart';
  ''');
  