small fix, don't worry about it

lifetimer/test/flutter_test_config.dart

@@ -0,0 +1,15 @@
+import 'dart:io';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:hive/hive.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+Future<void> testExecutable(dynamic Function() testMain) async {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  SharedPreferences.setMockInitialValues({});
+
+  final hiveDir = await Directory.systemTemp.createTemp('lifetimer_test_hive_');
+  Hive.init(hiveDir.path);
+
+  await Future<void>.sync(() => testMain());
+}