因此，我创建了一个更简单的抽象层次，将hive应用到我的flatter应用程序中。这应该是管理和访问所有配置单元框的中心点。由于在测试期间getapplicationdocumentsdirectory不可用，我如何仍然能够测试整个文件？

import 'package:boulder_fit/services/workout.dart';
import 'package:hive/hive.dart';
import 'package:path_provider/path_provider.dart' as path_rovider;

import 'workout.dart';

class HiveService {
  static final HiveService _singleton = HiveService._internal();

  static const String _workoutBox = "workoutBox";

  factory HiveService() {
    return _singleton;
  }
  HiveService._internal();

  static Future<void> init() async {
    final appDocumentDirectory =
        await path_rovider.getApplicationDocumentsDirectory();
    Hive.init(appDocumentDirectory.path);
    Hive.registerAdapter(WorkoutAdapter());
  }

  static Future openWorkouts() {
    return Hive.openBox<Workout>(_workoutBox);
  }

  static Future close() {
    return Hive.close();
  }

}