// 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/navigation_bar/navigation_bar.0.dart' as example; import 'package:flutter_test/flutter_test.dart'; void main() { testWidgets('Navigation bar updates destination on tap', (WidgetTester tester) async { await tester.pumpWidget( const example.NavigationBarApp(), ); final NavigationBar navigationBarWidget = tester.firstWidget(find.byType(NavigationBar)); /// NavigationDestinations must be rendered expect(find.text('Explore'), findsOneWidget); expect(find.text('Commute'), findsOneWidget); expect(find.text('Saved'), findsOneWidget); /// initial index must be zero expect(navigationBarWidget.selectedIndex, 0); /// switch to second tab await tester.tap(find.text('Commute')); await tester.pumpAndSettle(); expect(find.text('Page 2'), findsOneWidget); /// switch to third tab await tester.tap(find.text('Saved')); await tester.pumpAndSettle(); expect(find.text('Page 3'), findsOneWidget); }); }