anchor.diff:  
     setUpAll(() {
       fs = MemoryFileSystem();
  -    filePath = globals.fs.path.join('lib', 'foo.txt');
  +    filePath = fs.path.join('lib', 'foo.txt');
     });
   
     group('DevFSContent', () {
  
positive.code: final Map <String, Uri> _packages = <String, Uri>{};
  
  Directory _newTempDir(FileSystem fs) {
    final Directory tempDir = globals.fs.systemTempDirectory.createTempSync('flutter_devfs${_tempDirs.length}_test.');
    _tempDirs.add(tempDir);
    return tempDir;
  }
  
negative.code: import 'package:flutter_tools/src/compile.dart';
  import 'package:flutter_tools/src/devfs.dart';
  import 'package:flutter_tools/src/vmservice.dart';
  import 'package:json_rpc_2/json_rpc_2.dart' as rpc;
  import 'package:mockito/mockito.dart';
  
  