examples/api/test/widgets/preferred_size/preferred_size.0_test.dart

// Copyright 2014 The Flutter 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/material.dart';
import 'package:flutter_api_samples/widgets/preferred_size/preferred_size.0.dart'
    as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets(
    'PreferredSize determines the height of AppBarContent',
    (WidgetTester tester) async {
      await tester.pumpWidget(
        const example.PreferredSizeExampleApp(),
      );

      final PreferredSize preferredSize = tester.widget(
        find.ancestor(
          of: find.byType(example.AppBarContent),
          matching: find.byType(PreferredSize),
        ),
      );

      final RenderBox appBarContent = tester.renderObject(
        find.byType(example.AppBarContent),
      ) as RenderBox;

      expect(
        preferredSize.preferredSize.height,
        equals(appBarContent.size.height),
      );
    },
  );
}