anchor.diff:    MemoryFileSystem fileSystem;
     FakeStdio stdio;
     SymbolizeCommand command;
  -  MockDwarfSymbolizationService mockDwarfSymbolizationService;
   
     setUpAll(() {
       Cache.disableLocking();
  
positive.code:   setUp(() {
      fileSystem = MemoryFileSystem.test();
      stdio = FakeStdio();
      mockDwarfSymbolizationService = MockDwarfSymbolizationService();
      command = SymbolizeCommand(
        stdio: stdio,
        fileSystem: fileSystem,
        dwarfSymbolizationService: mockDwarfSymbolizationService,
      );
    });
  
  
negative.code: import 'dart:typed_data';
  
  import 'package:file/memory.dart';
  import 'package:file_testing/file_testing.dart';
  import 'package:flutter_tools/src/base/common.dart';
  import 'package:flutter_tools/src/base/file_system.dart';
  import 'package:flutter_tools/src/cache.dart';
  import 'package:flutter_tools/src/commands/symbolize.dart';
  import 'package:flutter_tools/src/convert.dart';
  import 'package:meta/meta.dart';
  import 'package:test/fake.dart';
  
  import '../../src/common.dart';
  import '../../src/context.dart';
  