examples/api/test/widgets/page_view/page_view.1_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/page_view/page_view.1.dart'
    as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets(
    'tapping Reverse button should reverse PageView',
    (WidgetTester tester) async {
      await tester.pumpWidget(const example.PageViewExampleApp());
      final Finder pageView = find.byType(PageView);
      final Finder reverseFinder = find.text('Reverse items');
      final Finder firstItemFinder = find.byKey(const ValueKey<String>('1'));
      final Finder lastItemFinder = find.byKey(const ValueKey<String>('5'));
      expect(pageView, findsOneWidget);
      expect(reverseFinder, findsOneWidget);
      expect(firstItemFinder, findsOneWidget);
      expect(lastItemFinder, findsNothing);
      await tester.tap(reverseFinder);
      await tester.pump();
      expect(firstItemFinder, findsNothing);
      expect(lastItemFinder, findsOneWidget);
    },
  );
}