测试:未找到 MaterialLocalizations。 AppBar 小部件需要提供 MaterialLocalizations

Question

在测试包含 Scaffold() 的全屏小部件时，出现此错误:

No MaterialLocalizations found.
AppBar widgets require MaterialLocalizations to be provided by a Localizations widget ancestor.

我试图注入(inject) Localizations 小部件，但错误仍然存​​在。对如何进行测试有任何想法吗？

testWidgets('MiniScaffold', (WidgetTester tester) async {
    await tester.pumpWidget(Wrap(child: MiniScaffold()));
    expect(find.text('Hello'), findsOneWidget);
    await tester.pumpWidget(Container());
  });

class MiniScaffold extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Hello'),
          actions: <Widget>[],
        ),
        body: Container());
  }
}

class Wrap extends StatelessWidget {
  final Widget child;

  const Wrap({Key key, this.child}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MediaQuery(
        data: new MediaQueryData(),
        child: Localizations(
            locale: Locale('en-US'),
            delegates: [
              DefaultMaterialLocalizations.delegate,
              DefaultWidgetsLocalizations.delegate,
            ],
            child: Directionality(
              textDirection: TextDirection.ltr,
              child: this.child,
            )));
  }
}

Answer 1

最简单的解决方案是将您的 Scaffold 包装到 MaterialApp

MaterialApp 将包括本地化、媒体查询和其他一些您自己必须包含的内容。