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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. | ||
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import 'package:flutter/widgets.dart'; | ||
import 'package:flutter_test/flutter_test.dart'; | ||
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void main() { | ||
testWidgets('Can call setState from didUpdateWidget', (WidgetTester tester) async { | ||
await tester.pumpWidget(const Directionality( | ||
textDirection: TextDirection.ltr, | ||
child: WidgetUnderTest(text: 'hello'), | ||
)); | ||
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expect(find.text('hello'), findsOneWidget); | ||
expect(find.text('world'), findsNothing); | ||
final _WidgetUnderTestState state = tester.state<_WidgetUnderTestState>(find.byType(WidgetUnderTest)); | ||
expect(state.setStateCalled, 0); | ||
expect(state.didUpdateWidgetCalled, 0); | ||
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await tester.pumpWidget(const Directionality( | ||
textDirection: TextDirection.ltr, | ||
child: WidgetUnderTest(text: 'world'), | ||
)); | ||
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expect(find.text('world'), findsOneWidget); | ||
expect(find.text('hello'), findsNothing); | ||
expect(state.setStateCalled, 1); | ||
expect(state.didUpdateWidgetCalled, 1); | ||
}); | ||
} | ||
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class WidgetUnderTest extends StatefulWidget { | ||
const WidgetUnderTest({super.key, required this.text}); | ||
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final String text; | ||
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@override | ||
State<WidgetUnderTest> createState() => _WidgetUnderTestState(); | ||
} | ||
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class _WidgetUnderTestState extends State<WidgetUnderTest> { | ||
late String text = widget.text; | ||
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int setStateCalled = 0; | ||
int didUpdateWidgetCalled = 0; | ||
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@override | ||
void didUpdateWidget(WidgetUnderTest oldWidget) { | ||
super.didUpdateWidget(oldWidget); | ||
didUpdateWidgetCalled += 1; | ||
if (oldWidget.text != widget.text) { | ||
// This setState is load bearing for the test. | ||
setState(() { | ||
text = widget.text; | ||
}); | ||
} | ||
} | ||
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@override | ||
void setState(VoidCallback fn) { | ||
super.setState(fn); | ||
setStateCalled += 1; | ||
} | ||
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@override | ||
Widget build(BuildContext context) { | ||
return Text(text); | ||
} | ||
} |
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