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widget_binding_observer.0_test.dart
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/
widget_binding_observer.0_test.dart
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// 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/services.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_api_samples/widgets/binding/widget_binding_observer.0.dart'
as example;
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('App tracks lifecycle states', (WidgetTester tester) async {
Future<void> setAppLifeCycleState(AppLifecycleState state) async {
final ByteData? message =
const StringCodec().encodeMessage(state.toString());
await tester.binding.defaultBinaryMessenger.handlePlatformMessage(
'flutter/lifecycle', message, (_) {});
}
await tester.pumpWidget(
const example.WidgetBindingObserverExampleApp(),
);
expect(find.text('There are no AppLifecycleStates to show.'), findsOneWidget);
await setAppLifeCycleState(AppLifecycleState.resumed);
await tester.pumpAndSettle();
expect(find.text('state is: AppLifecycleState.resumed'), findsOneWidget);
await setAppLifeCycleState(AppLifecycleState.inactive);
await tester.pumpAndSettle();
expect(find.text('state is: AppLifecycleState.inactive'), findsOneWidget);
await setAppLifeCycleState(AppLifecycleState.paused);
await tester.pumpAndSettle();
// Can't look for paused text here because rendering is paused.
await setAppLifeCycleState(AppLifecycleState.inactive);
await tester.pumpAndSettle();
expect(find.text('state is: AppLifecycleState.inactive'), findsNWidgets(2));
await setAppLifeCycleState(AppLifecycleState.resumed);
await tester.pumpAndSettle();
expect(find.text('state is: AppLifecycleState.resumed'), findsNWidgets(2));
});
}