Implement MemoryFileSystem.openSync() about file.dart HOT 2 CLOSED

import 'dart:io';
import 'package:file/memory.dart';

class TestZone {
  MemoryFileSystem _fs;

  TestZone({
    FileSystemStyle style = FileSystemStyle.posix,
    MemoryFileSystem fileSystem,
  }) {
    if (fileSystem == null) {
      _fs = MemoryFileSystem(style: style);
    } else {
      _fs = fileSystem;
    }
  }

  void run<R>(R Function() body) {
    IOOverrides.runZoned(
      body,
      createDirectory: (String path) => _fs.directory(path),
      createFile: (String path) => _fs.file(path),
      createLink: (String path) => _fs.link(path),
      getCurrentDirectory: () => _fs.currentDirectory,
      setCurrentDirectory: (String path) => _fs.currentDirectory = path,
      getSystemTempDirectory: () => _fs.systemTempDirectory,
      stat: (String path) => _fs.stat(path),
      statSync: (String path) => _fs.statSync(path),
      fseIdentical: (String p1, String p2) => _fs.identical(p1, p2),
      fseIdenticalSync: (String p1, String p2) => _fs.identicalSync(p1, p2),
      fseGetType: (String path, bool followLinks) =>
          _fs.type(path, followLinks: followLinks),
      fseGetTypeSync: (String path, bool followLinks) =>
          typeSync(path, followLinks),
      fsWatch: (String a, int b, bool c) =>
          throw UnsupportedError('unsupported'),
      fsWatchIsSupported: () => _fs.isWatchSupported
    );
  }

  FileSystemEntityType typeSync(String path, bool followLinks) {
    path = path.substring(0, path.length - 1);

    return _fs.typeSync(path, followLinks: followLinks);
  }
}

  @override
  io.RandomAccessFile openSync({io.FileMode mode = io.FileMode.read}) =>
      throw UnimplementedError('TODO');