// Copyright 2015 The Chromium 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 Changer extends StatefulWidget { @override ChangerState createState() => ChangerState(); } class ChangerState extends State<Changer> { void test0() { setState(() { }); } void test1() { setState(() => 1); } void test2() { setState(() async { }); } @override Widget build(BuildContext context) => const Text('test', textDirection: TextDirection.ltr); } void main() { testWidgets('setState() catches being used with an async callback', (WidgetTester tester) async { await tester.pumpWidget(Changer()); final ChangerState s = tester.state(find.byType(Changer)); expect(s.test0, isNot(throwsFlutterError)); expect(s.test1, isNot(throwsFlutterError)); expect(s.test2, throwsFlutterError); }); }