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// 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('Home'), findsOneWidget);
expect(find.text('Notifications'), findsOneWidget);
expect(find.text('Messages'), findsOneWidget);
/// Test notification badge.
final Badge notificationBadge = tester.firstWidget(find.ancestor(
of: find.byIcon(Icons.notifications_sharp),
matching: find.byType(Badge),
));
expect(notificationBadge.label, null);
/// Test messages badge.
final Badge messagesBadge = tester.firstWidget(find.ancestor(
of: find.byIcon(Icons.messenger_sharp),
matching: find.byType(Badge),
));
expect(messagesBadge.label, isNotNull);
/// Initial index must be zero
expect(navigationBarWidget.selectedIndex, 0);
expect(find.text('Home page'), findsOneWidget);
/// Switch to second tab
await tester.tap(find.text('Notifications'));
await tester.pumpAndSettle();
expect(find.text('This is a notification'), findsNWidgets(2));
/// Switch to third tab
await tester.tap(find.text('Messages'));
await tester.pumpAndSettle();
expect(find.text('Hi!'), findsOneWidget);
expect(find.text('Hello'), findsOneWidget);
});
}