flutter/packages/unit/test/widget/set_state_3_test.dart

59 lines
1.3 KiB
Dart

// 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/widgets.dart';
import 'package:test/test.dart';
import 'widget_tester.dart';
ChangerState changer;
class Changer extends StatefulComponent {
Changer(this.child);
final Widget child;
ChangerState createState() => new ChangerState();
}
class ChangerState extends State<Changer> {
bool _state = false;
void initState() {
super.initState();
changer = this;
}
void test() { setState(() { _state = true; }); }
Widget build(BuildContext context) => _state ? new Wrapper(config.child) : config.child;
}
class Wrapper extends StatelessComponent {
Wrapper(this.child);
final Widget child;
Widget build(BuildContext context) => child;
}
class Leaf extends StatefulComponent {
LeafState createState() => new LeafState();
}
class LeafState extends State<Leaf> {
Widget build(BuildContext context) => new Text("leaf");
}
void main() {
test('three-way setState() smoke test', () {
testWidgets((WidgetTester tester) {
tester.pumpWidget(new Changer(new Wrapper(new Leaf())));
tester.pumpWidget(new Changer(new Wrapper(new Leaf())));
changer.test();
tester.pump();
});
});
}