anchor.diff:  main() {
     defineReflectiveSuite(() {
       defineReflectiveTests(FixProcessorTest);
  +    defineReflectiveTests(FixProcessorTest_Driver);
       defineReflectiveTests(LintFixTest);
     });
   }
  
positive.code: import 'dart:async';
  
  import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
  import 'package:analysis_server/plugin/protocol/protocol.dart'
      hide AnalysisError;
  import 'package:analysis_server/src/services/correction/fix.dart';
  import 'package:analysis_server/src/services/correction/fix_internal.dart';
  import 'package:analyzer/dart/ast/standard_resolution_map.dart';
  import 'package:analyzer/error/error.dart';
  import 'package:analyzer/file_system/file_system.dart';
  import 'package:analyzer/source/package_map_resolver.dart';
  import 'package:analyzer/src/error/codes.dart';
  import 'package:analyzer/src/generated/parser.dart';
  import 'package:analyzer/src/generated/source.dart';
  import 'package:test/test.dart';
  
negative.code:     await resolveTestUnit('''
  import 'a/bb/my_lib.dart';
  ''');
      AnalysisError error = await _findErrorToFix();
      fix = await _assertHasFix(DartFixKind.CREATE_FILE, error);
      change = fix.change;
      // validate change
  