flutter_flutter/packages/flutter/test/widgets/set_state_5_test.dart
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---------

Co-authored-by: Kate Lovett <katelovett@google.com>
Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
2024-12-19 20:06:21 +00:00

35 lines
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Dart

// 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/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
class BadWidget extends StatefulWidget {
const BadWidget({super.key});
@override
State<StatefulWidget> createState() => BadWidgetState();
}
class BadWidgetState extends State<BadWidget> {
BadWidgetState() {
setState(() {
_count = 1;
});
}
int _count = 0;
@override
Widget build(BuildContext context) {
return Text(_count.toString());
}
}
void main() {
testWidgets('setState() catches being used inside a constructor', (WidgetTester tester) async {
await tester.pumpWidget(const BadWidget());
expect(tester.takeException(), isFlutterError);
});
}