set_state_5_test.dart 886 Bytes
Newer Older
Ian Hickson's avatar
Ian Hickson committed
1
// Copyright 2014 The Flutter Authors. All rights reserved.
2 3 4
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

5 6
// @dart = 2.8

7
import 'package:flutter_test/flutter_test.dart';
8
import 'package:flutter/widgets.dart';
9 10

class BadWidget extends StatefulWidget {
11
  const BadWidget({ Key key }) : super(key: key);
12
  @override
13
  State<StatefulWidget> createState() => BadWidgetState();
14 15 16 17 18
}

class BadWidgetState extends State<BadWidget> {
  BadWidgetState() {
    setState(() {
19
      _count = 1;
20 21
    });
  }
22

23 24 25 26
  int _count = 0;

  @override
  Widget build(BuildContext context) {
27
    return Text(_count.toString());
28 29 30 31 32
  }
}

void main() {
  testWidgets('setState() catches being used inside a constructor', (WidgetTester tester) async {
33
    await tester.pumpWidget(const BadWidget());
Dan Field's avatar
Dan Field committed
34
    expect(tester.takeException(), isFlutterError);
35 36
  });
}