在 Flutter 中测试本地化字符串

Posted 2023-02-23

【中文标题】在 Flutter 中测试本地化字符串

【英文标题】：Testing localized strings in Flutter

【发布时间】：2019-05-01 11:52:08

【问题描述】：

当我尝试测试包含的 Widget 时

 hintText: LocalizationResources.of(context).writecomment

我得到一个异常说：

The following NoSuchMethodError was thrown building CommentInput(dirty, state:
_CommentInputState#32224):
The getter 'writecomment' was called on null.

那么，我有什么遗漏的吗？ 小部件可以很好地构建在设备和模拟器上。

这是我的测试的样子：

....
 final Widget widget =
        MaterialApp(home: CommentWallWidget(channelUid: '123456'), title: 'jelena',);

    await tester.pumpWidget(widget);

而且 LocalizationResources 只是简单的 l10n：

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

import 'l10n/messages_all.dart';

///class containing localization logic and string getters
class LocalizationResources 
  static Future<LocalizationResources> load(Locale locale) 
    final String name =
        locale.countryCode.isEmpty ? locale.languageCode : locale.toString();
    final String localeName = Intl.canonicalizedLocale(name);

    return initializeMessages(localeName).then((_) 
      Intl.defaultLocale = localeName;
      return LocalizationResources();
    );
  

  static LocalizationResources of(BuildContext context) 
    return Localizations.of<LocalizationResources>(
        context, LocalizationResources);
  
....

【参考方案1】：

您需要将您的测试小部件包装在MediaQuery 小部件中并提供您的本地化委托。有关更多示例，请参阅here。

final Widget widget = MediaQuery(
  data: MediaQueryData(),
  child: MaterialApp(
    localizationsDelegates: [LocalizationResourcesDelegate()],
    home: CommentWallWidget(channelUid: '123456'),
    title: 'jelena',
  )
);