| // 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 'dart:typed_data'; |
| |
| import 'package:flutter_test/flutter_test.dart'; |
| import 'package:flutter/services.dart'; |
| import 'package:flutter/widgets.dart'; |
| |
| class MemoryPressureObserver with WidgetsBindingObserver { |
| bool sawMemoryPressure = false; |
| |
| @override |
| void didHaveMemoryPressure() { |
| sawMemoryPressure = true; |
| } |
| } |
| |
| class AppLifecycleStateObserver with WidgetsBindingObserver { |
| AppLifecycleState lifecycleState; |
| |
| @override |
| void didChangeAppLifecycleState(AppLifecycleState state) { |
| lifecycleState = state; |
| } |
| } |
| |
| class PushRouteObserver with WidgetsBindingObserver { |
| String pushedRoute; |
| |
| @override |
| Future<bool> didPushRoute(String route) async { |
| pushedRoute = route; |
| return true; |
| } |
| } |
| |
| void main() { |
| setUp(() { |
| WidgetsFlutterBinding.ensureInitialized(); |
| }); |
| |
| testWidgets('didHaveMemoryPressure callback', (WidgetTester tester) async { |
| final MemoryPressureObserver observer = MemoryPressureObserver(); |
| WidgetsBinding.instance.addObserver(observer); |
| final ByteData message = const JSONMessageCodec().encodeMessage( |
| <String, dynamic>{'type': 'memoryPressure'}); |
| await ServicesBinding.instance.defaultBinaryMessenger.handlePlatformMessage('flutter/system', message, (_) { }); |
| expect(observer.sawMemoryPressure, true); |
| WidgetsBinding.instance.removeObserver(observer); |
| }); |
| |
| testWidgets('handleLifecycleStateChanged callback', (WidgetTester tester) async { |
| final BinaryMessenger defaultBinaryMessenger = ServicesBinding.instance.defaultBinaryMessenger; |
| final AppLifecycleStateObserver observer = AppLifecycleStateObserver(); |
| WidgetsBinding.instance.addObserver(observer); |
| |
| ByteData message = const StringCodec().encodeMessage('AppLifecycleState.paused'); |
| await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { }); |
| expect(observer.lifecycleState, AppLifecycleState.paused); |
| |
| message = const StringCodec().encodeMessage('AppLifecycleState.resumed'); |
| await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { }); |
| expect(observer.lifecycleState, AppLifecycleState.resumed); |
| |
| message = const StringCodec().encodeMessage('AppLifecycleState.inactive'); |
| await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { }); |
| expect(observer.lifecycleState, AppLifecycleState.inactive); |
| |
| |
| message = const StringCodec().encodeMessage('AppLifecycleState.detached'); |
| await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { }); |
| // TODO(chunhtai): this should be detached once the issue is fixed |
| // https://github.com/flutter/flutter/issues/39832 |
| // The binding drops detached message for now. |
| expect(observer.lifecycleState, AppLifecycleState.inactive); |
| }); |
| |
| testWidgets('didPushRoute callback', (WidgetTester tester) async { |
| final PushRouteObserver observer = PushRouteObserver(); |
| WidgetsBinding.instance.addObserver(observer); |
| |
| const String testRouteName = 'testRouteName'; |
| final ByteData message = const JSONMethodCodec().encodeMethodCall( |
| const MethodCall('pushRoute', testRouteName)); |
| await ServicesBinding.instance.defaultBinaryMessenger.handlePlatformMessage('flutter/navigation', message, (_) { }); |
| expect(observer.pushedRoute, testRouteName); |
| |
| WidgetsBinding.instance.removeObserver(observer); |
| }); |
| |
| testWidgets('Application lifecycle affects frame scheduling', (WidgetTester tester) async { |
| final BinaryMessenger defaultBinaryMessenger = ServicesBinding.instance.defaultBinaryMessenger; |
| ByteData message; |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| |
| message = const StringCodec().encodeMessage('AppLifecycleState.paused'); |
| await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { }); |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| |
| message = const StringCodec().encodeMessage('AppLifecycleState.resumed'); |
| await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { }); |
| expect(tester.binding.hasScheduledFrame, isTrue); |
| await tester.pump(); |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| |
| message = const StringCodec().encodeMessage('AppLifecycleState.inactive'); |
| await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { }); |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| |
| message = const StringCodec().encodeMessage('AppLifecycleState.paused'); |
| await defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { }); |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| |
| tester.binding.scheduleFrame(); |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| |
| tester.binding.scheduleForcedFrame(); |
| expect(tester.binding.hasScheduledFrame, isTrue); |
| await tester.pump(); |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| |
| int frameCount = 0; |
| tester.binding.addPostFrameCallback((Duration duration) { frameCount += 1; }); |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| await tester.pump(const Duration(milliseconds: 1)); |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| expect(frameCount, 0); |
| |
| tester.binding.scheduleWarmUpFrame(); // this actually tests flutter_test's implementation |
| expect(tester.binding.hasScheduledFrame, isFalse); |
| expect(frameCount, 1); |
| }); |
| |
| testWidgets('scheduleFrameCallback error control test', (WidgetTester tester) async { |
| FlutterError error; |
| try { |
| tester.binding.scheduleFrameCallback(null, rescheduling: true); |
| } on FlutterError catch (e) { |
| error = e; |
| } |
| expect(error, isNotNull); |
| expect(error.diagnostics.length, 3); |
| expect(error.diagnostics.last.level, DiagnosticLevel.hint); |
| expect( |
| error.diagnostics.last.toStringDeep(), |
| equalsIgnoringHashCodes( |
| 'If this is the initial registration of the callback, or if the\n' |
| 'callback is asynchronous, then do not use the "rescheduling"\n' |
| 'argument.\n' |
| ), |
| ); |
| expect( |
| error.toStringDeep(), |
| 'FlutterError\n' |
| ' scheduleFrameCallback called with rescheduling true, but no\n' |
| ' callback is in scope.\n' |
| ' The "rescheduling" argument should only be set to true if the\n' |
| ' callback is being reregistered from within the callback itself,\n' |
| ' and only then if the callback itself is entirely synchronous.\n' |
| ' If this is the initial registration of the callback, or if the\n' |
| ' callback is asynchronous, then do not use the "rescheduling"\n' |
| ' argument.\n' |
| ); |
| }); |
| } |