flutter-go/packages/flutter_web/test/widgets/init_state_test.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_web_test/flutter_web_test.dart';
import 'package:flutter_web/widgets.dart';

List<String> ancestors = <String>[];

class TestWidget extends StatefulWidget {
  @override
  TestWidgetState createState() => TestWidgetState();
}

class TestWidgetState extends State<TestWidget> {
  @override
  void initState() {
    super.initState();
    context.visitAncestorElements((Element element) {
      ancestors.add(element.widget.runtimeType.toString());
      return true;
    });
  }

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

void main() {
  testWidgets('initState() is called when we are in the tree',
      (WidgetTester tester) async {
    await tester.pumpWidget(Container(child: TestWidget()));
    expect(
        ancestors,
        equals(
            <String>['Container', 'RenderObjectToWidgetAdapter<RenderBox>']));
  });
}