// 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/material/app_bar/app_bar.3.dart' as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('AppBar elevates when nested scroll view is scrolled underneath the AppBar', (
    WidgetTester tester,
  ) async {
    Material getMaterial() => tester.widget<Material>(
      find.descendant(of: find.byType(AppBar), matching: find.byType(Material)),
    );

    await tester.pumpWidget(const example.AppBarApp());

    // Starts with the base elevation.
    expect(getMaterial().elevation, 0.0);

    await tester.fling(find.text('Beach 3'), const Offset(0.0, -600.0), 2000.0);
    await tester.pumpAndSettle();

    // After scrolling it should be the scrolledUnderElevation.
    expect(getMaterial().elevation, 4.0);
  });
}