| // 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_test/flutter_test.dart'; |
| import 'package:flutter/widgets.dart'; |
| |
| class InnerWidget extends StatefulWidget { |
| const InnerWidget({ Key key }) : super(key: key); |
| |
| @override |
| InnerWidgetState createState() => InnerWidgetState(); |
| } |
| |
| class InnerWidgetState extends State<InnerWidget> { |
| bool _didInitState = false; |
| |
| @override |
| void initState() { |
| super.initState(); |
| _didInitState = true; |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return Container(); |
| } |
| } |
| |
| class OuterContainer extends StatefulWidget { |
| const OuterContainer({ Key key, this.child }) : super(key: key); |
| |
| final InnerWidget child; |
| |
| @override |
| OuterContainerState createState() => OuterContainerState(); |
| } |
| |
| class OuterContainerState extends State<OuterContainer> { |
| @override |
| Widget build(BuildContext context) { |
| return widget.child; |
| } |
| } |
| |
| void main() { |
| testWidgets('resync stateful widget', (WidgetTester tester) async { |
| const Key innerKey = Key('inner'); |
| const Key outerKey = Key('outer'); |
| |
| const InnerWidget inner1 = InnerWidget(key: innerKey); |
| InnerWidget inner2; |
| const OuterContainer outer1 = OuterContainer(key: outerKey, child: inner1); |
| OuterContainer outer2; |
| |
| await tester.pumpWidget(outer1); |
| |
| final StatefulElement innerElement = tester.element(find.byKey(innerKey)); |
| final InnerWidgetState innerElementState = innerElement.state as InnerWidgetState; |
| expect(innerElementState.widget, equals(inner1)); |
| expect(innerElementState._didInitState, isTrue); |
| expect(innerElement.renderObject.attached, isTrue); |
| |
| inner2 = const InnerWidget(key: innerKey); |
| outer2 = OuterContainer(key: outerKey, child: inner2); |
| |
| await tester.pumpWidget(outer2); |
| |
| expect(tester.element(find.byKey(innerKey)), equals(innerElement)); |
| expect(innerElement.state, equals(innerElementState)); |
| |
| expect(innerElementState.widget, equals(inner2)); |
| expect(innerElementState._didInitState, isTrue); |
| expect(innerElement.renderObject.attached, isTrue); |
| |
| final StatefulElement outerElement = tester.element(find.byKey(outerKey)); |
| expect(outerElement.state.widget, equals(outer2)); |
| outerElement.markNeedsBuild(); |
| await tester.pump(); |
| |
| expect(tester.element(find.byKey(innerKey)), equals(innerElement)); |
| expect(innerElement.state, equals(innerElementState)); |
| expect(innerElementState.widget, equals(inner2)); |
| expect(innerElement.renderObject.attached, isTrue); |
| }); |
| } |