flutter-go/packages/flutter_web/test/widgets/layout_builder_mutations_test.dart

// Copyright 2016 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_web/src/widgets/basic.dart';
import 'package:flutter_web/src/widgets/framework.dart';
import 'package:flutter_web/src/widgets/layout_builder.dart';
import 'package:flutter_web_test/flutter_web_test.dart';

class Wrapper extends StatelessWidget {
  const Wrapper({Key key, @required this.child})
      : assert(child != null),
        super(key: key);

  final Widget child;

  @override
  Widget build(BuildContext context) => child;
}

void main() {
  testWidgets('Moving a global key from another LayoutBuilder at layout time',
      (WidgetTester tester) async {
    final GlobalKey victimKey = GlobalKey();

    await tester.pumpWidget(Row(
      textDirection: TextDirection.ltr,
      children: <Widget>[
        Wrapper(
          child: LayoutBuilder(
              builder: (BuildContext context, BoxConstraints constraints) {
            return const SizedBox();
          }),
        ),
        Wrapper(child: Wrapper(child: LayoutBuilder(
            builder: (BuildContext context, BoxConstraints constraints) {
          return Wrapper(child: SizedBox(key: victimKey));
        }))),
      ],
    ));

    await tester.pumpWidget(Row(
      textDirection: TextDirection.ltr,
      children: <Widget>[
        Wrapper(child: LayoutBuilder(
            builder: (BuildContext context, BoxConstraints constraints) {
          return Wrapper(child: SizedBox(key: victimKey));
        })),
        Wrapper(child: Wrapper(child: LayoutBuilder(
            builder: (BuildContext context, BoxConstraints constraints) {
          return const SizedBox();
        }))),
      ],
    ));
  });
}