blob: 554f3e171c3ea8a451b2ab6e1eb6fa79f146fd65 [file] [log] [blame]
// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_test/flutter_test.dart';
class TestLocalizations {
TestLocalizations(this.locale, this.prefix);
final Locale locale;
final String? prefix;
static Future<TestLocalizations> loadSync(Locale locale, String? prefix) {
return SynchronousFuture<TestLocalizations>(TestLocalizations(locale, prefix));
}
static Future<TestLocalizations> loadAsync(Locale locale, String? prefix) {
return Future<TestLocalizations>.delayed(
const Duration(milliseconds: 100),
() => TestLocalizations(locale, prefix)
);
}
static TestLocalizations of(BuildContext context) {
return Localizations.of<TestLocalizations>(context, TestLocalizations)!;
}
String get message => '${prefix ?? ""}$locale';
}
class SyncTestLocalizationsDelegate extends LocalizationsDelegate<TestLocalizations> {
SyncTestLocalizationsDelegate([this.prefix]);
final String? prefix; // Changing this value triggers a rebuild
final List<bool> shouldReloadValues = <bool>[];
@override
bool isSupported(Locale locale) => true;
@override
Future<TestLocalizations> load(Locale locale) => TestLocalizations.loadSync(locale, prefix);
@override
bool shouldReload(SyncTestLocalizationsDelegate old) {
shouldReloadValues.add(prefix != old.prefix);
return prefix != old.prefix;
}
@override
String toString() => '${objectRuntimeType(this, 'SyncTestLocalizationsDelegate')}($prefix)';
}
class AsyncTestLocalizationsDelegate extends LocalizationsDelegate<TestLocalizations> {
AsyncTestLocalizationsDelegate([this.prefix]);
final String? prefix; // Changing this value triggers a rebuild
final List<bool> shouldReloadValues = <bool>[];
@override
bool isSupported(Locale locale) => true;
@override
Future<TestLocalizations> load(Locale locale) => TestLocalizations.loadAsync(locale, prefix);
@override
bool shouldReload(AsyncTestLocalizationsDelegate old) {
shouldReloadValues.add(prefix != old.prefix);
return prefix != old.prefix;
}
@override
String toString() => '${objectRuntimeType(this, 'AsyncTestLocalizationsDelegate')}($prefix)';
}
class MoreLocalizations {
MoreLocalizations(this.locale);
final Locale locale;
static Future<MoreLocalizations> loadSync(Locale locale) {
return SynchronousFuture<MoreLocalizations>(MoreLocalizations(locale));
}
static Future<MoreLocalizations> loadAsync(Locale locale) {
return Future<MoreLocalizations>.delayed(
const Duration(milliseconds: 100),
() => MoreLocalizations(locale)
);
}
static MoreLocalizations of(BuildContext context) {
return Localizations.of<MoreLocalizations>(context, MoreLocalizations)!;
}
String get message => '$locale';
}
class SyncMoreLocalizationsDelegate extends LocalizationsDelegate<MoreLocalizations> {
@override
Future<MoreLocalizations> load(Locale locale) => MoreLocalizations.loadSync(locale);
@override
bool isSupported(Locale locale) => true;
@override
bool shouldReload(SyncMoreLocalizationsDelegate old) => false;
}
class AsyncMoreLocalizationsDelegate extends LocalizationsDelegate<MoreLocalizations> {
@override
Future<MoreLocalizations> load(Locale locale) => MoreLocalizations.loadAsync(locale);
@override
bool isSupported(Locale locale) => true;
@override
bool shouldReload(AsyncMoreLocalizationsDelegate old) => false;
}
class OnlyRTLDefaultWidgetsLocalizations extends DefaultWidgetsLocalizations {
@override
TextDirection get textDirection => TextDirection.rtl;
}
class OnlyRTLDefaultWidgetsLocalizationsDelegate extends LocalizationsDelegate<WidgetsLocalizations> {
const OnlyRTLDefaultWidgetsLocalizationsDelegate();
@override
bool isSupported(Locale locale) => true;
@override
Future<WidgetsLocalizations> load(Locale locale) {
return SynchronousFuture<WidgetsLocalizations>(OnlyRTLDefaultWidgetsLocalizations());
}
@override
bool shouldReload(OnlyRTLDefaultWidgetsLocalizationsDelegate old) => false;
}
Widget buildFrame({
Locale? locale,
Iterable<LocalizationsDelegate<dynamic>>? delegates,
required WidgetBuilder buildContent,
LocaleResolutionCallback? localeResolutionCallback,
List<Locale> supportedLocales = const <Locale>[
Locale('en', 'US'),
Locale('en', 'GB'),
],
}) {
return WidgetsApp(
color: const Color(0xFFFFFFFF),
locale: locale,
localizationsDelegates: delegates,
localeResolutionCallback: localeResolutionCallback,
supportedLocales: supportedLocales,
onGenerateRoute: (RouteSettings settings) {
return PageRouteBuilder<void>(
pageBuilder: (BuildContext context, Animation<double> _, Animation<double> __) {
return buildContent(context);
}
);
},
);
}
class SyncLoadTest extends StatefulWidget {
const SyncLoadTest({super.key});
@override
SyncLoadTestState createState() => SyncLoadTestState();
}
class SyncLoadTestState extends State<SyncLoadTest> {
@override
Widget build(BuildContext context) {
return Text(
TestLocalizations.of(context).message,
textDirection: TextDirection.rtl,
);
}
}
void main() {
testWidgets('Localizations.localeFor in a WidgetsApp with system locale', (WidgetTester tester) async {
late BuildContext pageContext;
await tester.pumpWidget(
buildFrame(
buildContent: (BuildContext context) {
pageContext = context;
return const Text('Hello World', textDirection: TextDirection.ltr);
}
)
);
await tester.binding.setLocale('en', 'GB');
await tester.pump();
expect(Localizations.localeOf(pageContext), const Locale('en', 'GB'));
await tester.binding.setLocale('en', 'US');
await tester.pump();
expect(Localizations.localeOf(pageContext), const Locale('en', 'US'));
});
testWidgets('Localizations.localeFor in a WidgetsApp with an explicit locale', (WidgetTester tester) async {
const Locale locale = Locale('en', 'US');
late BuildContext pageContext;
await tester.pumpWidget(
buildFrame(
locale: locale,
buildContent: (BuildContext context) {
pageContext = context;
return const Text('Hello World');
},
)
);
expect(Localizations.localeOf(pageContext), locale);
await tester.binding.setLocale('en', 'GB');
await tester.pump();
// The WidgetApp's explicit locale overrides the system's locale.
expect(Localizations.localeOf(pageContext), locale);
});
testWidgets('Synchronously loaded localizations in a WidgetsApp', (WidgetTester tester) async {
final List<LocalizationsDelegate<dynamic>> delegates = <LocalizationsDelegate<dynamic>>[
SyncTestLocalizationsDelegate(),
DefaultWidgetsLocalizations.delegate,
];
Future<void> pumpTest(Locale locale) async {
await tester.pumpWidget(Localizations(
locale: locale,
delegates: delegates,
child: const SyncLoadTest(),
));
}
await pumpTest(const Locale('en', 'US'));
expect(find.text('en_US'), findsOneWidget);
await pumpTest(const Locale('en', 'GB'));
await tester.pump();
expect(find.text('en_GB'), findsOneWidget);
await pumpTest(const Locale('en', 'US'));
await tester.pump();
expect(find.text('en_US'), findsOneWidget);
});
testWidgets('Asynchronously loaded localizations in a WidgetsApp', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
AsyncTestLocalizationsDelegate(),
],
buildContent: (BuildContext context) {
return Text(TestLocalizations.of(context).message);
},
)
);
await tester.pump(const Duration(milliseconds: 50)); // TestLocalizations.loadAsync() takes 100ms
expect(find.text('en_US'), findsNothing); // TestLocalizations hasn't been loaded yet
await tester.pump(const Duration(milliseconds: 50)); // TestLocalizations.loadAsync() completes
await tester.pumpAndSettle();
expect(find.text('en_US'), findsOneWidget); // default test locale is US english
await tester.binding.setLocale('en', 'GB');
await tester.pump(const Duration(milliseconds: 100));
await tester.pumpAndSettle();
expect(find.text('en_GB'), findsOneWidget);
await tester.binding.setLocale('en', 'US');
await tester.pump(const Duration(milliseconds: 50));
// TestLocalizations.loadAsync() hasn't completed yet so the old text
// localization is still displayed
expect(find.text('en_GB'), findsOneWidget);
await tester.pump(const Duration(milliseconds: 50)); // finish the async load
await tester.pumpAndSettle();
expect(find.text('en_US'), findsOneWidget);
});
testWidgets('Localizations with multiple sync delegates', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
SyncTestLocalizationsDelegate(),
SyncMoreLocalizationsDelegate(),
],
locale: const Locale('en', 'US'),
buildContent: (BuildContext context) {
return Column(
children: <Widget>[
Text('A: ${TestLocalizations.of(context).message}'),
Text('B: ${MoreLocalizations.of(context).message}'),
],
);
},
)
);
// All localizations were loaded synchronously
expect(find.text('A: en_US'), findsOneWidget);
expect(find.text('B: en_US'), findsOneWidget);
});
testWidgets('Localizations with multiple delegates', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
SyncTestLocalizationsDelegate(),
AsyncMoreLocalizationsDelegate(), // No resources until this completes
],
locale: const Locale('en', 'US'),
buildContent: (BuildContext context) {
return Column(
children: <Widget>[
Text('A: ${TestLocalizations.of(context).message}'),
Text('B: ${MoreLocalizations.of(context).message}'),
],
);
},
)
);
await tester.pump(const Duration(milliseconds: 50));
expect(find.text('A: en_US'), findsNothing); // MoreLocalizations.load() hasn't completed yet
expect(find.text('B: en_US'), findsNothing);
await tester.pump(const Duration(milliseconds: 50));
await tester.pumpAndSettle();
expect(find.text('A: en_US'), findsOneWidget);
expect(find.text('B: en_US'), findsOneWidget);
});
testWidgets('Multiple Localizations', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
SyncTestLocalizationsDelegate(),
],
locale: const Locale('en', 'US'),
buildContent: (BuildContext context) {
return Column(
children: <Widget>[
Text('A: ${TestLocalizations.of(context).message}'),
Localizations(
locale: const Locale('en', 'GB'),
delegates: <LocalizationsDelegate<dynamic>>[
SyncTestLocalizationsDelegate(),
DefaultWidgetsLocalizations.delegate,
],
// Create a new context within the en_GB Localization
child: Builder(
builder: (BuildContext context) {
return Text('B: ${TestLocalizations.of(context).message}');
},
),
),
],
);
},
)
);
expect(find.text('A: en_US'), findsOneWidget);
expect(find.text('B: en_GB'), findsOneWidget);
});
// If both the locale and the length and type of a Localizations delegate list
// stays the same BUT one of its delegate.shouldReload() methods returns true,
// then the dependent widgets should rebuild.
testWidgets('Localizations sync delegate shouldReload returns true', (WidgetTester tester) async {
final SyncTestLocalizationsDelegate originalDelegate = SyncTestLocalizationsDelegate();
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
originalDelegate,
SyncMoreLocalizationsDelegate(),
],
locale: const Locale('en', 'US'),
buildContent: (BuildContext context) {
return Column(
children: <Widget>[
Text('A: ${TestLocalizations.of(context).message}'),
Text('B: ${MoreLocalizations.of(context).message}'),
],
);
},
)
);
await tester.pumpAndSettle();
expect(find.text('A: en_US'), findsOneWidget);
expect(find.text('B: en_US'), findsOneWidget);
expect(originalDelegate.shouldReloadValues, <bool>[]);
final SyncTestLocalizationsDelegate modifiedDelegate = SyncTestLocalizationsDelegate('---');
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
modifiedDelegate,
SyncMoreLocalizationsDelegate(),
],
locale: const Locale('en', 'US'),
buildContent: (BuildContext context) {
return Column(
children: <Widget>[
Text('A: ${TestLocalizations.of(context).message}'),
Text('B: ${MoreLocalizations.of(context).message}'),
],
);
},
)
);
await tester.pumpAndSettle();
expect(find.text('A: ---en_US'), findsOneWidget);
expect(find.text('B: en_US'), findsOneWidget);
expect(modifiedDelegate.shouldReloadValues, <bool>[true]);
expect(originalDelegate.shouldReloadValues, <bool>[]);
});
testWidgets('Localizations async delegate shouldReload returns true', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
AsyncTestLocalizationsDelegate(),
AsyncMoreLocalizationsDelegate(),
],
locale: const Locale('en', 'US'),
buildContent: (BuildContext context) {
return Column(
children: <Widget>[
Text('A: ${TestLocalizations.of(context).message}'),
Text('B: ${MoreLocalizations.of(context).message}'),
],
);
},
)
);
await tester.pumpAndSettle();
expect(find.text('A: en_US'), findsOneWidget);
expect(find.text('B: en_US'), findsOneWidget);
final AsyncTestLocalizationsDelegate modifiedDelegate = AsyncTestLocalizationsDelegate('---');
await tester.pumpWidget(
buildFrame(
delegates: <LocalizationsDelegate<dynamic>>[
modifiedDelegate,
AsyncMoreLocalizationsDelegate(),
],
locale: const Locale('en', 'US'),
buildContent: (BuildContext context) {
return Column(
children: <Widget>[
Text('A: ${TestLocalizations.of(context).message}'),
Text('B: ${MoreLocalizations.of(context).message}'),
],
);
},
)
);
await tester.pumpAndSettle();
expect(find.text('A: ---en_US'), findsOneWidget);
expect(find.text('B: en_US'), findsOneWidget);
expect(modifiedDelegate.shouldReloadValues, <bool>[true]);
});
testWidgets('Directionality tracks system locale', (WidgetTester tester) async {
late BuildContext pageContext;
await tester.pumpWidget(
buildFrame(
delegates: const <LocalizationsDelegate<dynamic>>[
GlobalWidgetsLocalizations.delegate,
],
supportedLocales: const <Locale>[
Locale('en', 'GB'),
Locale('ar', 'EG'),
],
buildContent: (BuildContext context) {
pageContext = context;
return const Text('Hello World');
},
)
);
await tester.binding.setLocale('en', 'GB');
await tester.pump();
expect(Directionality.of(pageContext), TextDirection.ltr);
await tester.binding.setLocale('ar', 'EG');
await tester.pump();
expect(Directionality.of(pageContext), TextDirection.rtl);
});
testWidgets('localeResolutionCallback override', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
localeResolutionCallback: (Locale? newLocale, Iterable<Locale> supportedLocales) {
return const Locale('foo', 'BAR');
},
buildContent: (BuildContext context) {
return Text(Localizations.localeOf(context).toString());
},
)
);
await tester.pumpAndSettle();
expect(find.text('foo_BAR'), findsOneWidget);
await tester.binding.setLocale('en', 'GB');
await tester.pumpAndSettle();
expect(find.text('foo_BAR'), findsOneWidget);
});
testWidgets('supportedLocales and defaultLocaleChangeHandler', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('zh', 'CN'),
Locale('en', 'GB'),
Locale('en', 'CA'),
],
buildContent: (BuildContext context) {
return Text(Localizations.localeOf(context).toString());
},
)
);
await tester.pumpAndSettle();
expect(find.text('en_GB'), findsOneWidget);
// defaultLocaleChangedHandler prefers exact supported locale match
await tester.binding.setLocale('en', 'CA');
await tester.pumpAndSettle();
expect(find.text('en_CA'), findsOneWidget);
// defaultLocaleChangedHandler chooses 1st matching supported locale.languageCode
await tester.binding.setLocale('en', 'US');
await tester.pumpAndSettle();
expect(find.text('en_GB'), findsOneWidget);
// defaultLocaleChangedHandler: no matching supported locale, so use the 1st one
await tester.binding.setLocale('da', 'DA');
await tester.pumpAndSettle();
expect(find.text('zh_CN'), findsOneWidget);
});
testWidgets("Localizations.override widget tracks parent's locale and delegates", (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
// Accept whatever locale we're given
localeResolutionCallback: (Locale? locale, Iterable<Locale> supportedLocales) => locale,
delegates: const <LocalizationsDelegate<dynamic>>[
GlobalWidgetsLocalizations.delegate,
],
buildContent: (BuildContext context) {
return Localizations.override(
context: context,
child: Builder(
builder: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
final TextDirection direction = WidgetsLocalizations.of(context).textDirection;
return Text('$locale $direction');
},
),
);
},
)
);
// Initial WidgetTester locale is `en_US`.
await tester.pumpAndSettle();
expect(find.text('en_US TextDirection.ltr'), findsOneWidget);
await tester.binding.setLocale('en', 'CA');
await tester.pumpAndSettle();
expect(find.text('en_CA TextDirection.ltr'), findsOneWidget);
await tester.binding.setLocale('ar', 'EG');
await tester.pumpAndSettle();
expect(find.text('ar_EG TextDirection.rtl'), findsOneWidget);
await tester.binding.setLocale('da', 'DA');
await tester.pumpAndSettle();
expect(find.text('da_DA TextDirection.ltr'), findsOneWidget);
});
testWidgets("Localizations.override widget overrides parent's DefaultWidgetLocalizations", (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
// Accept whatever locale we're given
localeResolutionCallback: (Locale? locale, Iterable<Locale> supportedLocales) => locale,
buildContent: (BuildContext context) {
return Localizations.override(
context: context,
delegates: const <OnlyRTLDefaultWidgetsLocalizationsDelegate>[
// Override: no matter what the locale, textDirection is always RTL.
OnlyRTLDefaultWidgetsLocalizationsDelegate(),
],
child: Builder(
builder: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
final TextDirection direction = WidgetsLocalizations.of(context).textDirection;
return Text('$locale $direction');
},
),
);
},
)
);
// Initial WidgetTester locale is `en_US`.
await tester.pumpAndSettle();
expect(find.text('en_US TextDirection.rtl'), findsOneWidget);
await tester.binding.setLocale('en', 'CA');
await tester.pumpAndSettle();
expect(find.text('en_CA TextDirection.rtl'), findsOneWidget);
await tester.binding.setLocale('ar', 'EG');
await tester.pumpAndSettle();
expect(find.text('ar_EG TextDirection.rtl'), findsOneWidget);
await tester.binding.setLocale('da', 'DA');
await tester.pumpAndSettle();
expect(find.text('da_DA TextDirection.rtl'), findsOneWidget);
});
testWidgets('WidgetsApp overrides DefaultWidgetLocalizations', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
// Accept whatever locale we're given
localeResolutionCallback: (Locale? locale, Iterable<Locale> supportedLocales) => locale,
delegates: <OnlyRTLDefaultWidgetsLocalizationsDelegate>[
const OnlyRTLDefaultWidgetsLocalizationsDelegate(),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
final TextDirection direction = WidgetsLocalizations.of(context).textDirection;
return Text('$locale $direction');
},
)
);
// Initial WidgetTester locale is `en_US`.
await tester.pumpAndSettle();
expect(find.text('en_US TextDirection.rtl'), findsOneWidget);
await tester.binding.setLocale('en', 'CA');
await tester.pumpAndSettle();
expect(find.text('en_CA TextDirection.rtl'), findsOneWidget);
await tester.binding.setLocale('ar', 'EG');
await tester.pumpAndSettle();
expect(find.text('ar_EG TextDirection.rtl'), findsOneWidget);
await tester.binding.setLocale('da', 'DA');
await tester.pumpAndSettle();
expect(find.text('da_DA TextDirection.rtl'), findsOneWidget);
});
// We provide <Locale>[Locale('en', 'US'), Locale('zh', 'CN')] as ui.window.locales
// for flutter tester so that the behavior of tests match that of production
// environments. Here, we test the default locales.
testWidgets('WidgetsApp DefaultWidgetLocalizations', (WidgetTester tester) async {
await tester.pumpAndSettle();
await tester.pumpWidget(
buildFrame(
// Accept whatever locale we're given
localeResolutionCallback: (Locale? locale, Iterable<Locale> supportedLocales) => locale,
delegates: <OnlyRTLDefaultWidgetsLocalizationsDelegate>[
const OnlyRTLDefaultWidgetsLocalizationsDelegate(),
],
buildContent: (BuildContext context) {
final Locale locale1 = WidgetsBinding.instance.platformDispatcher.locales.first;
final Locale locale2 = WidgetsBinding.instance.platformDispatcher.locales[1];
return Text('$locale1 $locale2');
},
)
);
// Initial WidgetTester default locales is `en_US` and `zh_CN`.
await tester.pumpAndSettle();
expect(find.text('en_US zh_CN'), findsOneWidget);
});
testWidgets('WidgetsApp.locale is resolved against supportedLocales', (WidgetTester tester) async {
// app locale matches a supportedLocale
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('zh', 'CN'),
Locale('en', 'US'),
],
locale: const Locale('en', 'US'),
buildContent: (BuildContext context) {
return Text(Localizations.localeOf(context).toString());
},
)
);
await tester.pumpAndSettle();
expect(find.text('en_US'), findsOneWidget);
// app locale matches a supportedLocale's language
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('zh', 'CN'),
Locale('en', 'GB'),
],
locale: const Locale('en', 'US'),
buildContent: (BuildContext context) {
return Text(Localizations.localeOf(context).toString());
},
)
);
await tester.pumpAndSettle();
expect(find.text('en_GB'), findsOneWidget);
// app locale matches no supportedLocale
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('zh', 'CN'),
Locale('en', 'US'),
],
locale: const Locale('ab', 'CD'),
buildContent: (BuildContext context) {
return Text(Localizations.localeOf(context).toString());
},
)
);
await tester.pumpAndSettle();
expect(find.text('zh_CN'), findsOneWidget);
});
// Example from http://unicode.org/reports/tr35/#LanguageMatching
testWidgets('WidgetsApp Unicode tr35 1', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('de'),
Locale('fr'),
Locale('ja'),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'de', countryCode: 'AT'),
Locale.fromSubtags(languageCode: 'fr'),]
);
await tester.pumpAndSettle();
expect(find.text('de'), findsOneWidget);
});
// Examples from http://unicode.org/reports/tr35/#LanguageMatching
testWidgets('WidgetsApp Unicode tr35 2', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('ja', 'JP'),
Locale('de'),
Locale('zh', 'TW'),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'de'),
Locale.fromSubtags(languageCode: 'fr'),
Locale.fromSubtags(languageCode: 'de', countryCode: 'SW'),
Locale.fromSubtags(languageCode: 'it'),]
);
await tester.pumpAndSettle();
expect(find.text('de'), findsOneWidget);
});
testWidgets('WidgetsApp EdgeCase Chinese', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale.fromSubtags(languageCode: 'zh'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'TW'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'HK'),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'de'),
Locale.fromSubtags(languageCode: 'fr'),
Locale.fromSubtags(languageCode: 'de', countryCode: 'SW'),
Locale.fromSubtags(languageCode: 'zh'),]
);
await tester.pumpAndSettle();
expect(find.text('zh'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'TW'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', countryCode: 'TW'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', countryCode: 'HK'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_HK'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'HK'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('zh'), findsOneWidget);
// This behavior is up to the implementer to decide if a perfect scriptCode match
// is better than a countryCode match.
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'CN'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),
Locale.fromSubtags(languageCode: 'zh', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
// languageCode only match is not enough to prevent resolving a perfect match
// further down the preferredLocales list.
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'JP'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
// When no language match, we try for country only, since it is likely users are
// at least familiar with their country's language. This is a possible case only
// on iOS, where countryCode can be selected independently from language and script.
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', scriptCode: 'Hans', countryCode: 'TW'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'TW'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'HK'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_HK'), findsOneWidget);
});
// Same as 'WidgetsApp EdgeCase Chinese' test except the supportedLocales order is
// reversed.
testWidgets('WidgetsApp EdgeCase ReverseChinese', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'HK'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'TW'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),
Locale.fromSubtags(languageCode: 'zh'),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'de'),
Locale.fromSubtags(languageCode: 'fr'),
Locale.fromSubtags(languageCode: 'de', countryCode: 'SW'),
Locale.fromSubtags(languageCode: 'zh'),]
);
await tester.pumpAndSettle();
expect(find.text('zh'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_HK'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_HK'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'TW'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', countryCode: 'TW'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', countryCode: 'HK'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_HK'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'HK'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_HK'), findsOneWidget);
// This behavior is up to the implementer to decide if a perfect scriptCode match
// is better than a countryCode match.
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant', countryCode: 'CN'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),
Locale.fromSubtags(languageCode: 'zh', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_HK'), findsOneWidget);
// languageCode only match is not enough to prevent resolving a perfect match
// further down the preferredLocales list.
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'JP'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'zh', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),
Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans', countryCode: 'CN'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hans_CN'), findsOneWidget);
// When no language match, we try for country only, since it is likely users are
// at least familiar with their country's language. This is a possible case only
// on iOS, where countryCode can be selected independently from language and script.
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', scriptCode: 'Hans', countryCode: 'TW'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'TW'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_TW'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'HK'),]
);
await tester.pumpAndSettle();
expect(find.text('zh_Hant_HK'), findsOneWidget);
});
// Examples from https://developer.android.com/guide/topics/resources/multilingual-support
testWidgets('WidgetsApp Android', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('en'),
Locale('de', 'DE'),
Locale('es', 'ES'),
Locale('fr', 'FR'),
Locale('it', 'IT'),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'fr', countryCode: 'CH'),]
);
await tester.pumpAndSettle();
expect(find.text('fr_FR'), findsOneWidget);
});
// Examples from https://developer.android.com/guide/topics/resources/multilingual-support
testWidgets('WidgetsApp Android', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('en'),
Locale('de', 'DE'),
Locale('es', 'ES'),
Locale('it', 'IT'),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'fr', countryCode: 'CH'),
Locale.fromSubtags(languageCode: 'it', countryCode: 'CH'),]
);
await tester.pumpAndSettle();
expect(find.text('it_IT'), findsOneWidget);
});
testWidgets('WidgetsApp Country-only fallback', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('en', 'US'),
Locale('de', 'DE'),
Locale('de', 'AU'),
Locale('de', 'LU'),
Locale('de', 'CH'),
Locale('es', 'ES'),
Locale('es', 'US'),
Locale('it', 'IT'),
Locale('zh', 'CN'),
Locale('zh', 'TW'),
Locale('fr', 'FR'),
Locale('br', 'FR'),
Locale('pt', 'BR'),
Locale('pt', 'PT'),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'ar', countryCode: 'CH'),]
);
await tester.pumpAndSettle();
expect(find.text('de_CH'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'ar', countryCode: 'FR'),]
);
await tester.pumpAndSettle();
expect(find.text('fr_FR'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'ar', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('en_US'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'es', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('es_US'), findsOneWidget);
// Strongly prefer matching first locale even if next one is perfect.
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'pt'),
Locale.fromSubtags(languageCode: 'pt', countryCode: 'PT'),]
);
await tester.pumpAndSettle();
expect(find.text('pt_PT'), findsOneWidget);
// Don't country match with any other available match. This behavior is
// up for reconsideration.
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'ar', countryCode: 'BR'),
Locale.fromSubtags(languageCode: 'pt'),]
);
await tester.pumpAndSettle();
expect(find.text('pt_BR'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'ar', countryCode: 'BR'),
Locale.fromSubtags(languageCode: 'pt', countryCode: 'PT'),]
);
await tester.pumpAndSettle();
expect(find.text('pt_PT'), findsOneWidget);
});
// Simulates a Chinese-default app that supports english in Canada but not
// French. French-Canadian users should get 'en_CA' instead of Chinese.
testWidgets('WidgetsApp Multilingual country', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('zh', 'CN'),
Locale('en', 'CA'),
Locale('en', 'US'),
Locale('en', 'AU'),
Locale('de', 'DE'),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'fr', countryCode: 'CA'),
Locale.fromSubtags(languageCode: 'fr'),]
);
await tester.pumpAndSettle();
expect(find.text('en_CA'), findsOneWidget);
});
testWidgets('WidgetsApp Common cases', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
// Decently well localized app.
supportedLocales: const <Locale>[
Locale('en', 'US'),
Locale('en', 'GB'),
Locale('en', 'AU'),
Locale('en', 'CA'),
Locale('zh', 'CN'),
Locale('zh', 'TW'),
Locale('de', 'DE'),
Locale('de', 'CH'),
Locale('es', 'MX'),
Locale('es', 'ES'),
Locale('es', 'AR'),
Locale('es', 'CO'),
Locale('ru', 'RU'),
Locale('fr', 'FR'),
Locale('fr', 'CA'),
Locale('ar', 'SA'),
Locale('ar', 'EG'),
Locale('ar', 'IQ'),
Locale('ar', 'MA'),
Locale('af'),
Locale('bg'),
Locale('nl', 'NL'),
Locale('pl'),
Locale('cs'),
Locale('fa'),
Locale('el'),
Locale('he'),
Locale('hi'),
Locale('pa'),
Locale('ta'),
Locale('id'),
Locale('it', 'IT'),
Locale('ja'),
Locale('ko'),
Locale('ms'),
Locale('mn'),
Locale('pt', 'BR'),
Locale('pt', 'PT'),
Locale('sv', 'SE'),
Locale('th'),
Locale('tr'),
Locale('vi'),
],
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('en_US'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en'),]
);
await tester.pumpAndSettle();
expect(find.text('en_US'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'CA'),]
);
await tester.pumpAndSettle();
expect(find.text('en_CA'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'AU'),]
);
await tester.pumpAndSettle();
expect(find.text('en_AU'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'ar', countryCode: 'CH'),]
);
await tester.pumpAndSettle();
expect(find.text('ar_SA'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'ar'),]
);
await tester.pumpAndSettle();
expect(find.text('ar_SA'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'ar', countryCode: 'IQ'),]
);
await tester.pumpAndSettle();
expect(find.text('ar_IQ'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'es', countryCode: 'ES'),]
);
await tester.pumpAndSettle();
expect(find.text('es_ES'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'es'),]
);
await tester.pumpAndSettle();
expect(find.text('es_MX'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'pa', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('pa'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'hi', countryCode: 'IN'),]
);
await tester.pumpAndSettle();
expect(find.text('hi'), findsOneWidget);
// Multiple preferred locales:
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'NZ'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'AU'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'GB'),
Locale.fromSubtags(languageCode: 'en'),]
);
await tester.pumpAndSettle();
expect(find.text('en_AU'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'ab'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'NZ'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'AU'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'GB'),
Locale.fromSubtags(languageCode: 'en'),]
);
await tester.pumpAndSettle();
expect(find.text('en_AU'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'NZ'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'PH'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'ZA'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'CB'),]
);
await tester.pumpAndSettle();
expect(find.text('en_US'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'CA'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'AU'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'GB'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('en_CA'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'da'),
Locale.fromSubtags(languageCode: 'en'),
Locale.fromSubtags(languageCode: 'en', countryCode: 'CA'),]
);
await tester.pumpAndSettle();
expect(find.text('en_CA'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'da'),
Locale.fromSubtags(languageCode: 'fo'),
Locale.fromSubtags(languageCode: 'hr'),]
);
await tester.pumpAndSettle();
expect(find.text('en_US'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'da'),
Locale.fromSubtags(languageCode: 'fo'),
Locale.fromSubtags(languageCode: 'hr', countryCode: 'CA'),]
);
await tester.pumpAndSettle();
expect(find.text('en_CA'), findsOneWidget);
});
testWidgets('WidgetsApp invalid preferredLocales', (WidgetTester tester) async {
await tester.pumpWidget(
buildFrame(
supportedLocales: const <Locale>[
Locale('zh', 'CN'),
Locale('en', 'CA'),
Locale('en', 'US'),
Locale('en', 'AU'),
Locale('de', 'DE'),
],
localeResolutionCallback: (Locale? locale, Iterable<Locale> supportedLocales) {
if (locale == null) {
return const Locale('und', 'US');
}
return const Locale('en', 'US');
},
buildContent: (BuildContext context) {
final Locale locale = Localizations.localeOf(context);
return Text('$locale');
},
)
);
await tester.binding.setLocales(const <Locale>[
Locale.fromSubtags(languageCode: 'en', countryCode: 'US'),]
);
await tester.pumpAndSettle();
expect(find.text('en_US'), findsOneWidget);
await tester.binding.setLocales(const <Locale>[]);
await tester.pumpAndSettle();
expect(find.text('und_US'), findsOneWidget);
});
}