routes_test.dart 65 KB
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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import 'dart:collection';

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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter_test/flutter_test.dart';
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import '../flutter_test_alternative.dart' show Fake;
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import 'semantics_tester.dart';

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final List<String> results = <String>[];

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Set<TestRoute> routes = HashSet<TestRoute>();
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class TestRoute extends Route<String?> with LocalHistoryRoute<String?> {
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  TestRoute(this.name);
  final String name;

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  @override
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  List<OverlayEntry> get overlayEntries => _entries;

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  final List<OverlayEntry> _entries = <OverlayEntry>[];
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  void log(String s) {
    results.add('$name: $s');
  }

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  @override
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  void install() {
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    log('install');
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    final OverlayEntry entry = OverlayEntry(
      builder: (BuildContext context) => Container(),
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      opaque: true,
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    );
    _entries.add(entry);
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    routes.add(this);
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    super.install();
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  }

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  @override
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  TickerFuture didPush() {
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    log('didPush');
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    return super.didPush();
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  }

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  @override
  void didAdd() {
    log('didAdd');
    super.didAdd();
  }

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  @override
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  void didReplace(Route<dynamic>? oldRoute) {
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    expect(oldRoute, isA<TestRoute>());
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    final TestRoute castRoute = oldRoute! as TestRoute;
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    log('didReplace ${castRoute.name}');
    super.didReplace(castRoute);
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  }

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  @override
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  bool didPop(String? result) {
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    log('didPop $result');
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    bool returnValue;
    if (returnValue = super.didPop(result))
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      navigator!.finalizeRoute(this);
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    return returnValue;
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  }

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  @override
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  void didPopNext(Route<dynamic> nextRoute) {
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    expect(nextRoute, isA<TestRoute>());
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    final TestRoute castRoute = nextRoute as TestRoute;
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    log('didPopNext ${castRoute.name}');
    super.didPopNext(castRoute);
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  }

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  @override
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  void didChangeNext(Route<dynamic>? nextRoute) {
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    expect(nextRoute, anyOf(isNull, isA<TestRoute>()));
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    final TestRoute? castRoute = nextRoute as TestRoute?;
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    log('didChangeNext ${castRoute?.name}');
    super.didChangeNext(castRoute);
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  }

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  @override
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  void dispose() {
    log('dispose');
    _entries.clear();
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    routes.remove(this);
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    super.dispose();
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  }

}

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Future<void> runNavigatorTest(
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  WidgetTester tester,
  NavigatorState host,
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  VoidCallback test,
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  List<String> expectations, [
  List<String> expectationsAfterAnotherPump = const <String>[],
]) async {
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  expect(host, isNotNull);
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  test();
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  expect(results, equals(expectations));
  results.clear();
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  await tester.pump();
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  expect(results, equals(expectationsAfterAnotherPump));
  results.clear();
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}

void main() {
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  testWidgets('Route settings', (WidgetTester tester) async {
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    const RouteSettings settings = RouteSettings(name: 'A');
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    expect(settings, hasOneLineDescription);
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    final RouteSettings settings2 = settings.copyWith(name: 'B');
    expect(settings2.name, 'B');
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  });

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  testWidgets('Route settings arguments', (WidgetTester tester) async {
    const RouteSettings settings = RouteSettings(name: 'A');
    expect(settings.arguments, isNull);

    final Object arguments = Object();
    final RouteSettings settings2 = RouteSettings(name: 'A', arguments: arguments);
    expect(settings2.arguments, same(arguments));

    final RouteSettings settings3 = settings2.copyWith();
    expect(settings3.arguments, equals(arguments));

    final Object arguments2 = Object();
    final RouteSettings settings4 = settings2.copyWith(arguments: arguments2);
    expect(settings4.arguments, same(arguments2));
    expect(settings4.arguments, isNot(same(arguments)));
  });

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  testWidgets('Route management - push, replace, pop sequence', (WidgetTester tester) async {
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    final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
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    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
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        child: Navigator(
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          key: navigatorKey,
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          onGenerateRoute: (_) => TestRoute('initial'),
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        ),
      ),
    );
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    final NavigatorState host = navigatorKey.currentState!;
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    await runNavigatorTest(
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      tester,
      host,
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      () { },
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      <String>[
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        'initial: install',
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        'initial: didAdd',
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        'initial: didChangeNext null',
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      ],
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    );
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    late TestRoute second;
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.push(second = TestRoute('second')); },
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      <String>[ // stack is: initial, second
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        'second: install',
        'second: didPush',
        'second: didChangeNext null',
        'initial: didChangeNext second',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.push(TestRoute('third')); },
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      <String>[ // stack is: initial, second, third
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        'third: install',
        'third: didPush',
        'third: didChangeNext null',
        'second: didChangeNext third',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.replace(oldRoute: second, newRoute: TestRoute('two')); },
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      <String>[ // stack is: initial, two, third
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        'two: install',
        'two: didReplace second',
        'two: didChangeNext third',
        'initial: didChangeNext two',
        'second: dispose',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.pop('hello'); },
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      <String>[ // stack is: initial, two
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        'third: didPop hello',
        'two: didPopNext third',
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      ],
      <String>[
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        'third: dispose',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.pop('good bye'); },
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      <String>[ // stack is: initial
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        'two: didPop good bye',
        'initial: didPopNext two',
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      ],
      <String>[
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        'two: dispose',
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      ],
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    );
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    await tester.pumpWidget(Container());
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    expect(results, equals(<String>['initial: dispose']));
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    expect(routes.isEmpty, isTrue);
    results.clear();
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  });

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  testWidgets('Route management - push, remove, pop', (WidgetTester tester) async {
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    final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
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    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
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        child: Navigator(
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          key: navigatorKey,
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          onGenerateRoute: (_) => TestRoute('first'),
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        ),
      ),
    );
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    final NavigatorState host = navigatorKey.currentState!;
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    await runNavigatorTest(
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      tester,
      host,
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      () { },
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      <String>[
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        'first: install',
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        'first: didAdd',
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        'first: didChangeNext null',
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      ],
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    );
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    late TestRoute second;
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.push(second = TestRoute('second')); },
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      <String>[
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        'second: install',
        'second: didPush',
        'second: didChangeNext null',
        'first: didChangeNext second',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.push(TestRoute('third')); },
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      <String>[
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        'third: install',
        'third: didPush',
        'third: didChangeNext null',
        'second: didChangeNext third',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.removeRouteBelow(second); },
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      <String>[
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        'first: dispose',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.pop('good bye'); },
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      <String>[
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        'third: didPop good bye',
        'second: didPopNext third',
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      ],
      <String>[
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        'third: dispose',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.push(TestRoute('three')); },
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      <String>[
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        'three: install',
        'three: didPush',
        'three: didChangeNext null',
        'second: didChangeNext three',
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      ],
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    );
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    late TestRoute four;
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.push(four = TestRoute('four')); },
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      <String>[
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        'four: install',
        'four: didPush',
        'four: didChangeNext null',
        'three: didChangeNext four',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.removeRouteBelow(four); },
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      <String>[
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        'second: didChangeNext four',
        'three: dispose',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.pop('the end'); },
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      <String>[
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        'four: didPop the end',
        'second: didPopNext four',
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      ],
      <String>[
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        'four: dispose',
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      ],
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    );
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    await tester.pumpWidget(Container());
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    expect(results, equals(<String>['second: dispose']));
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    expect(routes.isEmpty, isTrue);
    results.clear();
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  });

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  testWidgets('Route management - push, replace, popUntil', (WidgetTester tester) async {
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    final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
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    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
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        child: Navigator(
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          key: navigatorKey,
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          onGenerateRoute: (_) => TestRoute('A'),
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        ),
      ),
    );
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    final NavigatorState host = navigatorKey.currentState!;
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    await runNavigatorTest(
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      tester,
      host,
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      () { },
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      <String>[
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        'A: install',
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        'A: didAdd',
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        'A: didChangeNext null',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.push(TestRoute('B')); },
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      <String>[
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        'B: install',
        'B: didPush',
        'B: didChangeNext null',
        'A: didChangeNext B',
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      ],
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    );
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    late TestRoute routeC;
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.push(routeC = TestRoute('C')); },
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      <String>[
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        'C: install',
        'C: didPush',
        'C: didChangeNext null',
        'B: didChangeNext C',
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      ],
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    );
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    expect(routeC.isActive, isTrue);
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    late TestRoute routeB;
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.replaceRouteBelow(anchorRoute: routeC, newRoute: routeB = TestRoute('b')); },
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      <String>[
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        'b: install',
        'b: didReplace B',
        'b: didChangeNext C',
        'A: didChangeNext b',
        'B: dispose',
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      ],
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    );
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    await runNavigatorTest(
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      tester,
      host,
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      () { host.popUntil((Route<dynamic> route) => route == routeB); },
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      <String>[
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        'C: didPop null',
        'b: didPopNext C',
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      ],
      <String>[
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        'C: dispose',
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      ],
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    );
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    await tester.pumpWidget(Container());
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    expect(results, equals(<String>['A: dispose', 'b: dispose']));
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    expect(routes.isEmpty, isTrue);
    results.clear();
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  });
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  testWidgets('Route localHistory - popUntil', (WidgetTester tester) async {
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    final TestRoute routeA = TestRoute('A');
    routeA.addLocalHistoryEntry(LocalHistoryEntry(
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      onRemove: () { routeA.log('onRemove 0'); }
    ));
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    routeA.addLocalHistoryEntry(LocalHistoryEntry(
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      onRemove: () { routeA.log('onRemove 1'); }
    ));
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    final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
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    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
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        child: Navigator(
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          key: navigatorKey,
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          onGenerateRoute: (_) => routeA,
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        ),
      ),
    );
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    final NavigatorState host = navigatorKey.currentState!;
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    await runNavigatorTest(
      tester,
      host,
      () { host.popUntil((Route<dynamic> route) => !route.willHandlePopInternally); },
      <String>[
        'A: install',
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        'A: didAdd',
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        'A: didChangeNext null',
        'A: didPop null',
        'A: onRemove 1',
        'A: didPop null',
        'A: onRemove 0',
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      ],
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    );

    await runNavigatorTest(
      tester,
      host,
      () { host.popUntil((Route<dynamic> route) => !route.willHandlePopInternally); },
      <String>[
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      ],
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    );
  });
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  group('PageRouteObserver', () {
    test('calls correct listeners', () {
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      final RouteObserver<PageRoute<dynamic>> observer = RouteObserver<PageRoute<dynamic>>();
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      final MockRouteAware pageRouteAware1 = MockRouteAware();
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      final MockPageRoute route1 = MockPageRoute();
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      observer.subscribe(pageRouteAware1, route1);
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      expect(pageRouteAware1.didPushCount, 1);
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      final MockRouteAware pageRouteAware2 = MockRouteAware();
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      final MockPageRoute route2 = MockPageRoute();
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      observer.didPush(route2, route1);
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      expect(pageRouteAware1.didPushNextCount, 1);
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      observer.subscribe(pageRouteAware2, route2);
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      expect(pageRouteAware2.didPushCount, 1);
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      observer.didPop(route2, route1);
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      expect(pageRouteAware2.didPopCount, 1);
      expect(pageRouteAware1.didPopNextCount, 1);
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    });

    test('does not call listeners for non-PageRoute', () {
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      final RouteObserver<PageRoute<dynamic>> observer = RouteObserver<PageRoute<dynamic>>();
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      final MockRouteAware pageRouteAware = MockRouteAware();
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      final MockPageRoute pageRoute = MockPageRoute();
      final MockRoute route = MockRoute();
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      observer.subscribe(pageRouteAware, pageRoute);
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      expect(pageRouteAware.didPushCount, 1);
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      observer.didPush(route, pageRoute);
      observer.didPop(route, pageRoute);
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      expect(pageRouteAware.didPushCount, 1);
      expect(pageRouteAware.didPopCount, 0);
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    });
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    test('does not call listeners when already subscribed', () {
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      final RouteObserver<PageRoute<dynamic>> observer = RouteObserver<PageRoute<dynamic>>();
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      final MockRouteAware pageRouteAware = MockRouteAware();
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      final MockPageRoute pageRoute = MockPageRoute();
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      observer.subscribe(pageRouteAware, pageRoute);
      observer.subscribe(pageRouteAware, pageRoute);
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      expect(pageRouteAware.didPushCount, 1);
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    });

    test('does not call listeners when unsubscribed', () {
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      final RouteObserver<PageRoute<dynamic>> observer = RouteObserver<PageRoute<dynamic>>();
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      final MockRouteAware pageRouteAware = MockRouteAware();
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      final MockPageRoute pageRoute = MockPageRoute();
      final MockPageRoute nextPageRoute = MockPageRoute();
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      observer.subscribe(pageRouteAware, pageRoute);
      observer.subscribe(pageRouteAware, nextPageRoute);
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      expect(pageRouteAware.didPushCount, 2);
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      observer.unsubscribe(pageRouteAware);

      observer.didPush(nextPageRoute, pageRoute);
      observer.didPop(nextPageRoute, pageRoute);
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      expect(pageRouteAware.didPushCount, 2);
      expect(pageRouteAware.didPopCount, 0);
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    });
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  });
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  testWidgets('Can autofocus a TextField nested in a Focus in a route.', (WidgetTester tester) async {
    final TextEditingController controller = TextEditingController();

    final FocusNode focusNode = FocusNode(debugLabel: 'Test Node');
    await tester.pumpWidget(
      Material(
        child: MaterialApp(
          onGenerateRoute: (RouteSettings settings) {
            return PageRouteBuilder<void>(
              settings: settings,
              pageBuilder: (BuildContext context, Animation<double> input, Animation<double> out) {
                return Focus(
                  child: TextField(
                    autofocus: true,
                    focusNode: focusNode,
                    controller: controller,
                  ),
                );
              },
            );
          },
        ),
      ),
    );
    await tester.pump();

    expect(focusNode.hasPrimaryFocus, isTrue);
  });
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  group('PageRouteBuilder', () {
    testWidgets('reverseTransitionDuration defaults to 300ms', (WidgetTester tester) async {
      // Default PageRouteBuilder reverse transition duration should be 300ms.
      await tester.pumpWidget(
        MaterialApp(
          onGenerateRoute: (RouteSettings settings) {
            return MaterialPageRoute<dynamic>(
              builder: (BuildContext context) {
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                return ElevatedButton(
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                  onPressed: () {
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                    Navigator.of(context)!.push<void>(
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                      PageRouteBuilder<void>(
                        settings: settings,
                        pageBuilder: (BuildContext context, Animation<double> input, Animation<double> out) {
                          return const Text('Page Two');
                        },
                      )
                    );
                  },
                  child: const Text('Open page'),
                );
              },
            );
          },
        )
      );

      // Open the new route.
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      await tester.tap(find.byType(ElevatedButton));
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      await tester.pumpAndSettle();
      expect(find.text('Open page'), findsNothing);
      expect(find.text('Page Two'), findsOneWidget);

      // Pop the new route.
      tester.state<NavigatorState>(find.byType(Navigator)).pop();
      await tester.pump();
      expect(find.text('Page Two'), findsOneWidget);

      // Text('Page Two') should be present halfway through the reverse transition.
      await tester.pump(const Duration(milliseconds: 150));
      expect(find.text('Page Two'), findsOneWidget);

      // Text('Page Two') should be present at the very end of the reverse transition.
      await tester.pump(const Duration(milliseconds: 150));
      expect(find.text('Page Two'), findsOneWidget);

      // Text('Page Two') have transitioned out after 300ms.
      await tester.pump(const Duration(milliseconds: 1));
      expect(find.text('Page Two'), findsNothing);
      expect(find.text('Open page'), findsOneWidget);
    });

    testWidgets('reverseTransitionDuration can be customized', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        onGenerateRoute: (RouteSettings settings) {
          return MaterialPageRoute<dynamic>(
            builder: (BuildContext context) {
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              return ElevatedButton(
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                onPressed: () {
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                  Navigator.of(context)!.push<void>(
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                    PageRouteBuilder<void>(
                      settings: settings,
                      pageBuilder: (BuildContext context, Animation<double> input, Animation<double> out) {
                        return const Text('Page Two');
                      },
                      // modified value, default PageRouteBuilder reverse transition duration should be 300ms.
                      reverseTransitionDuration: const Duration(milliseconds: 150),
                    )
                  );
                },
                child: const Text('Open page'),
              );
            },
          );
        })
      );

      // Open the new route.
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      await tester.tap(find.byType(ElevatedButton));
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      await tester.pumpAndSettle();
      expect(find.text('Open page'), findsNothing);
      expect(find.text('Page Two'), findsOneWidget);

      // Pop the new route.
      tester.state<NavigatorState>(find.byType(Navigator)).pop();
      await tester.pump();
      expect(find.text('Page Two'), findsOneWidget);

      // Text('Page Two') should be present halfway through the reverse transition.
      await tester.pump(const Duration(milliseconds: 75));
      expect(find.text('Page Two'), findsOneWidget);

      // Text('Page Two') should be present at the very end of the reverse transition.
      await tester.pump(const Duration(milliseconds: 75));
      expect(find.text('Page Two'), findsOneWidget);

      // Text('Page Two') have transitioned out after 500ms.
      await tester.pump(const Duration(milliseconds: 1));
      expect(find.text('Page Two'), findsNothing);
      expect(find.text('Open page'), findsOneWidget);
    });
  });

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  group('TransitionRoute', () {
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    testWidgets('secondary animation is kDismissed when next route finishes pop', (WidgetTester tester) async {
      final GlobalKey<NavigatorState> navigator = GlobalKey<NavigatorState>();
      await tester.pumpWidget(
        MaterialApp(
          navigatorKey: navigator,
          home: const Text('home'),
        )
      );

      // Push page one, its secondary animation is kAlwaysDismissedAnimation.
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      late ProxyAnimation secondaryAnimationProxyPageOne;
      late ProxyAnimation animationPageOne;
      navigator.currentState!.push(
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        PageRouteBuilder<void>(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
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            secondaryAnimationProxyPageOne = secondaryAnimation as ProxyAnimation;
            animationPageOne = animation as ProxyAnimation;
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            return const Text('Page One');
          },
        ),
      );
      await tester.pump();
      await tester.pumpAndSettle();
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      final ProxyAnimation secondaryAnimationPageOne = secondaryAnimationProxyPageOne.parent! as ProxyAnimation;
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      expect(animationPageOne.value, 1.0);
      expect(secondaryAnimationPageOne.parent, kAlwaysDismissedAnimation);

      // Push page two, the secondary animation of page one is the primary
      // animation of page two.
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      late ProxyAnimation secondaryAnimationProxyPageTwo;
      late ProxyAnimation animationPageTwo;
      navigator.currentState!.push(
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        PageRouteBuilder<void>(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
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            secondaryAnimationProxyPageTwo = secondaryAnimation as ProxyAnimation;
            animationPageTwo = animation as ProxyAnimation;
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            return const Text('Page Two');
          },
        ),
      );
      await tester.pump();
      await tester.pumpAndSettle();
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      final ProxyAnimation secondaryAnimationPageTwo = secondaryAnimationProxyPageTwo.parent! as ProxyAnimation;
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      expect(animationPageTwo.value, 1.0);
      expect(secondaryAnimationPageTwo.parent, kAlwaysDismissedAnimation);
      expect(secondaryAnimationPageOne.parent, animationPageTwo.parent);

      // Pop page two, the secondary animation of page one becomes
      // kAlwaysDismissedAnimation.
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      navigator.currentState!.pop();
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      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));
      expect(secondaryAnimationPageOne.parent, animationPageTwo.parent);
      await tester.pumpAndSettle();
      expect(animationPageTwo.value, 0.0);
      expect(secondaryAnimationPageOne.parent, kAlwaysDismissedAnimation);
    });

    testWidgets('secondary animation is kDismissed when next route is removed', (WidgetTester tester) async {
      final GlobalKey<NavigatorState> navigator = GlobalKey<NavigatorState>();
      await tester.pumpWidget(
          MaterialApp(
            navigatorKey: navigator,
            home: const Text('home'),
          )
      );

      // Push page one, its secondary animation is kAlwaysDismissedAnimation.
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      late ProxyAnimation secondaryAnimationProxyPageOne;
      late ProxyAnimation animationPageOne;
      navigator.currentState!.push(
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        PageRouteBuilder<void>(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
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            secondaryAnimationProxyPageOne = secondaryAnimation as ProxyAnimation;
            animationPageOne = animation as ProxyAnimation;
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            return const Text('Page One');
          },
        ),
      );
      await tester.pump();
      await tester.pumpAndSettle();
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      final ProxyAnimation secondaryAnimationPageOne = secondaryAnimationProxyPageOne.parent! as ProxyAnimation;
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      expect(animationPageOne.value, 1.0);
      expect(secondaryAnimationPageOne.parent, kAlwaysDismissedAnimation);

      // Push page two, the secondary animation of page one is the primary
      // animation of page two.
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      late ProxyAnimation secondaryAnimationProxyPageTwo;
      late ProxyAnimation animationPageTwo;
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      Route<void> secondRoute;
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      navigator.currentState!.push(
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        secondRoute = PageRouteBuilder<void>(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
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            secondaryAnimationProxyPageTwo = secondaryAnimation as ProxyAnimation;
            animationPageTwo = animation as ProxyAnimation;
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            return const Text('Page Two');
          },
        ),
      );
      await tester.pump();
      await tester.pumpAndSettle();
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      final ProxyAnimation secondaryAnimationPageTwo = secondaryAnimationProxyPageTwo.parent! as ProxyAnimation;
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      expect(animationPageTwo.value, 1.0);
      expect(secondaryAnimationPageTwo.parent, kAlwaysDismissedAnimation);
      expect(secondaryAnimationPageOne.parent, animationPageTwo.parent);

      // Remove the second route, the secondary animation of page one is
      // kAlwaysDismissedAnimation again.
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      navigator.currentState!.removeRoute(secondRoute);
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      await tester.pump();
      expect(secondaryAnimationPageOne.parent, kAlwaysDismissedAnimation);
    });

    testWidgets('secondary animation is kDismissed after train hopping finishes and pop', (WidgetTester tester) async {
      final GlobalKey<NavigatorState> navigator = GlobalKey<NavigatorState>();
      await tester.pumpWidget(
          MaterialApp(
            navigatorKey: navigator,
            home: const Text('home'),
          )
      );

      // Push page one, its secondary animation is kAlwaysDismissedAnimation.
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      late ProxyAnimation secondaryAnimationProxyPageOne;
      late ProxyAnimation animationPageOne;
      navigator.currentState!.push(
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        PageRouteBuilder<void>(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
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            secondaryAnimationProxyPageOne = secondaryAnimation as ProxyAnimation;
            animationPageOne = animation as ProxyAnimation;
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            return const Text('Page One');
          },
        ),
      );
      await tester.pump();
      await tester.pumpAndSettle();
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      final ProxyAnimation secondaryAnimationPageOne = secondaryAnimationProxyPageOne.parent! as ProxyAnimation;
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      expect(animationPageOne.value, 1.0);
      expect(secondaryAnimationPageOne.parent, kAlwaysDismissedAnimation);

      // Push page two, the secondary animation of page one is the primary
      // animation of page two.
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      late ProxyAnimation animationPageTwo;
      navigator.currentState!.push(
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        PageRouteBuilder<void>(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
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            animationPageTwo = animation as ProxyAnimation;
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            return const Text('Page Two');
          },
        ),
      );
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));
      expect(secondaryAnimationPageOne.parent, animationPageTwo.parent);

      // Replace with a different route while push is ongoing to trigger
      // TrainHopping.
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      late ProxyAnimation animationPageThree;
      navigator.currentState!.pushReplacement(
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        TestPageRouteBuilder(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
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            animationPageThree = animation as ProxyAnimation;
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            return const Text('Page Three');
          },
        ),
      );
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 1));
      expect(secondaryAnimationPageOne.parent, isA<TrainHoppingAnimation>());
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      final TrainHoppingAnimation trainHopper = secondaryAnimationPageOne.parent! as TrainHoppingAnimation;
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      expect(trainHopper.currentTrain, animationPageTwo.parent);
      await tester.pump(const Duration(milliseconds: 100));
      expect(secondaryAnimationPageOne.parent, isNot(isA<TrainHoppingAnimation>()));
      expect(secondaryAnimationPageOne.parent, animationPageThree.parent);
      expect(trainHopper.currentTrain, isNull); // Has been disposed.
      await tester.pumpAndSettle();
      expect(secondaryAnimationPageOne.parent, animationPageThree.parent);

      // Pop page three.
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      navigator.currentState!.pop();
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      await tester.pump();
      await tester.pumpAndSettle();
      expect(secondaryAnimationPageOne.parent, kAlwaysDismissedAnimation);
    });

    testWidgets('secondary animation is kDismissed when train hopping is interrupted', (WidgetTester tester) async {
      final GlobalKey<NavigatorState> navigator = GlobalKey<NavigatorState>();
      await tester.pumpWidget(
          MaterialApp(
            navigatorKey: navigator,
            home: const Text('home'),
          )
      );

      // Push page one, its secondary animation is kAlwaysDismissedAnimation.
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      late ProxyAnimation secondaryAnimationProxyPageOne;
      late ProxyAnimation animationPageOne;
      navigator.currentState!.push(
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        PageRouteBuilder<void>(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
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            secondaryAnimationProxyPageOne = secondaryAnimation as ProxyAnimation;
            animationPageOne = animation as ProxyAnimation;
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            return const Text('Page One');
          },
        ),
      );
      await tester.pump();
      await tester.pumpAndSettle();
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      final ProxyAnimation secondaryAnimationPageOne = secondaryAnimationProxyPageOne.parent! as ProxyAnimation;
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      expect(animationPageOne.value, 1.0);
      expect(secondaryAnimationPageOne.parent, kAlwaysDismissedAnimation);

      // Push page two, the secondary animation of page one is the primary
      // animation of page two.
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      late ProxyAnimation animationPageTwo;
      navigator.currentState!.push(
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        PageRouteBuilder<void>(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
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            animationPageTwo = animation as ProxyAnimation;
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            return const Text('Page Two');
          },
        ),
      );
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));
      expect(secondaryAnimationPageOne.parent, animationPageTwo.parent);

      // Replace with a different route while push is ongoing to trigger
      // TrainHopping.
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      navigator.currentState!.pushReplacement(
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        TestPageRouteBuilder(
          pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
            return const Text('Page Three');
          },
        ),
      );
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 10));
      expect(secondaryAnimationPageOne.parent, isA<TrainHoppingAnimation>());
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      final TrainHoppingAnimation trainHopper = secondaryAnimationPageOne.parent! as TrainHoppingAnimation;
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      expect(trainHopper.currentTrain, animationPageTwo.parent);

      // Pop page three while replacement push is ongoing.
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      navigator.currentState!.pop();
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      await tester.pump();
      expect(secondaryAnimationPageOne.parent, isA<TrainHoppingAnimation>());
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      final TrainHoppingAnimation trainHopper2 = secondaryAnimationPageOne.parent! as TrainHoppingAnimation;
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      expect(trainHopper2.currentTrain, animationPageTwo.parent);
      expect(trainHopper.currentTrain, isNull); // Has been disposed.
      await tester.pumpAndSettle();
      expect(secondaryAnimationPageOne.parent, kAlwaysDismissedAnimation);
      expect(trainHopper2.currentTrain, isNull); // Has been disposed.
    });
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    testWidgets('secondary animation is triggered when pop initial route', (WidgetTester tester) async {
      final GlobalKey<NavigatorState> navigator = GlobalKey<NavigatorState>();
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      late Animation<double> secondaryAnimationOfRouteOne;
      late Animation<double> primaryAnimationOfRouteTwo;
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      await tester.pumpWidget(
        MaterialApp(
          navigatorKey: navigator,
          onGenerateRoute: (RouteSettings settings) {
            return PageRouteBuilder<void>(
              settings: settings,
              pageBuilder: (_, Animation<double> animation, Animation<double> secondaryAnimation) {
                if (settings.name == '/')
                  secondaryAnimationOfRouteOne = secondaryAnimation;
                else
                  primaryAnimationOfRouteTwo = animation;
                return const Text('Page');
              },
            );
          },
          initialRoute: '/a',
        )
      );
      // The secondary animation of the bottom route should be chained with the
      // primary animation of top most route.
      expect(secondaryAnimationOfRouteOne.value, 1.0);
      expect(secondaryAnimationOfRouteOne.value, primaryAnimationOfRouteTwo.value);
      // Pops the top most route and verifies two routes are still chained.
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      navigator.currentState!.pop();
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      await tester.pump();
      await tester.pump(const Duration(milliseconds: 30));
      expect(secondaryAnimationOfRouteOne.value, 0.9);
      expect(secondaryAnimationOfRouteOne.value, primaryAnimationOfRouteTwo.value);
      await tester.pumpAndSettle();
      expect(secondaryAnimationOfRouteOne.value, 0.0);
      expect(secondaryAnimationOfRouteOne.value, primaryAnimationOfRouteTwo.value);
    });

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    testWidgets('showGeneralDialog handles transparent barrier color', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        home: Builder(
          builder: (BuildContext context) {
955
            return ElevatedButton(
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              onPressed: () {
                showGeneralDialog<void>(
                  context: context,
                  barrierDismissible: true,
                  barrierLabel: 'barrier_label',
                  barrierColor: const Color(0x00000000),
                  transitionDuration: Duration.zero,
                  pageBuilder: (BuildContext innerContext, _, __) {
                    return const SizedBox();
                  },
                );
              },
              child: const Text('Show Dialog'),
            );
          },
        ),
      ));

      // Open the dialog.
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      await tester.tap(find.byType(ElevatedButton));
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      await tester.pump();
      expect(find.byType(ModalBarrier), findsNWidgets(2));

      // Close the dialog.
      await tester.tapAt(Offset.zero);
      await tester.pump();
      expect(find.byType(ModalBarrier), findsNWidgets(1));
    });

    testWidgets('showGeneralDialog adds non-dismissable barrier when barrierDismissable is false', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        home: Builder(
          builder: (BuildContext context) {
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            return ElevatedButton(
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              onPressed: () {
                showGeneralDialog<void>(
                  context: context,
                  barrierDismissible: false,
                  transitionDuration: Duration.zero,
                  pageBuilder: (BuildContext innerContext, _, __) {
                    return const SizedBox();
                  },
                );
              },
              child: const Text('Show Dialog'),
            );
          },
        ),
      ));

      // Open the dialog.
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      await tester.tap(find.byType(ElevatedButton));
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      await tester.pump();
      expect(find.byType(ModalBarrier), findsNWidgets(2));
      final ModalBarrier barrier = find.byType(ModalBarrier).evaluate().last.widget as ModalBarrier;
      expect(barrier.dismissible, isFalse);

      // Close the dialog.
      final StatefulElement navigatorElement = find.byType(Navigator).evaluate().last as StatefulElement;
      final NavigatorState navigatorState = navigatorElement.state as NavigatorState;
      navigatorState.pop();
      await tester.pumpAndSettle();
      expect(find.byType(ModalBarrier), findsNWidgets(1));
    });

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    testWidgets('showGeneralDialog uses root navigator by default', (WidgetTester tester) async {
      final DialogObserver rootObserver = DialogObserver();
      final DialogObserver nestedObserver = DialogObserver();

      await tester.pumpWidget(MaterialApp(
        navigatorObservers: <NavigatorObserver>[rootObserver],
        home: Navigator(
          observers: <NavigatorObserver>[nestedObserver],
          onGenerateRoute: (RouteSettings settings) {
            return MaterialPageRoute<dynamic>(
              builder: (BuildContext context) {
1032
                return ElevatedButton(
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                  onPressed: () {
                    showGeneralDialog<void>(
                      context: context,
                      barrierDismissible: false,
                      transitionDuration: Duration.zero,
                      pageBuilder: (BuildContext innerContext, _, __) {
                        return const SizedBox();
                      },
                    );
                  },
                  child: const Text('Show Dialog'),
                );
              },
            );
          },
        ),
      ));

      // Open the dialog.
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      await tester.tap(find.byType(ElevatedButton));
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      expect(rootObserver.dialogCount, 1);
      expect(nestedObserver.dialogCount, 0);
    });

    testWidgets('showGeneralDialog uses nested navigator if useRootNavigator is false', (WidgetTester tester) async {
      final DialogObserver rootObserver = DialogObserver();
      final DialogObserver nestedObserver = DialogObserver();

      await tester.pumpWidget(MaterialApp(
        navigatorObservers: <NavigatorObserver>[rootObserver],
        home: Navigator(
          observers: <NavigatorObserver>[nestedObserver],
          onGenerateRoute: (RouteSettings settings) {
            return MaterialPageRoute<dynamic>(
              builder: (BuildContext context) {
1069
                return ElevatedButton(
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                  onPressed: () {
                    showGeneralDialog<void>(
                      useRootNavigator: false,
                      context: context,
                      barrierDismissible: false,
                      transitionDuration: Duration.zero,
                      pageBuilder: (BuildContext innerContext, _, __) {
                        return const SizedBox();
                      },
                    );
                  },
                  child: const Text('Show Dialog'),
                );
              },
            );
          },
        ),
      ));

      // Open the dialog.
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      await tester.tap(find.byType(ElevatedButton));
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      expect(rootObserver.dialogCount, 0);
      expect(nestedObserver.dialogCount, 1);
    });
1095

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    testWidgets('showGeneralDialog default argument values', (WidgetTester tester) async {
      final DialogObserver rootObserver = DialogObserver();

      await tester.pumpWidget(MaterialApp(
        navigatorObservers: <NavigatorObserver>[rootObserver],
        home: Navigator(
          onGenerateRoute: (RouteSettings settings) {
            return MaterialPageRoute<dynamic>(
              builder: (BuildContext context) {
1105
                return ElevatedButton(
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                  onPressed: () {
                    showGeneralDialog<void>(
                      context: context,
                      pageBuilder: (BuildContext innerContext, _, __) {
                        return const SizedBox();
                      },
                    );
                  },
                  child: const Text('Show Dialog'),
                );
              },
            );
          },
        ),
      ));

      // Open the dialog.
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      await tester.tap(find.byType(ElevatedButton));
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      expect(rootObserver.dialogRoutes.length, equals(1));
      final ModalRoute<dynamic> route = rootObserver.dialogRoutes.last;
      expect(route.barrierDismissible, isNotNull);
      expect(route.barrierColor, isNotNull);
      expect(route.transitionDuration, isNotNull);
    });

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    testWidgets('reverseTransitionDuration defaults to transitionDuration', (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();

      // Default MaterialPageRoute transition duration should be 300ms.
      await tester.pumpWidget(MaterialApp(
        onGenerateRoute: (RouteSettings settings) {
          return MaterialPageRoute<dynamic>(
            builder: (BuildContext context) {
1139
              return ElevatedButton(
1140
                onPressed: () {
1141
                  Navigator.of(context)!.push<void>(
1142
                    MaterialPageRoute<void>(
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                      builder: (BuildContext innerContext) {
                        return Container(
                          key: containerKey,
                          color: Colors.green,
                        );
                      },
                    ),
                  );
                },
                child: const Text('Open page'),
              );
            },
          );
        },
      ));

      // Open the new route.
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      await tester.tap(find.byType(ElevatedButton));
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      await tester.pumpAndSettle();
      expect(find.text('Open page'), findsNothing);
      expect(find.byKey(containerKey), findsOneWidget);

      // Pop the new route.
      tester.state<NavigatorState>(find.byType(Navigator)).pop();
      await tester.pump();
      expect(find.byKey(containerKey), findsOneWidget);

      // Container should be present halfway through the transition.
      await tester.pump(const Duration(milliseconds: 150));
      expect(find.byKey(containerKey), findsOneWidget);

      // Container should be present at the very end of the transition.
      await tester.pump(const Duration(milliseconds: 150));
      expect(find.byKey(containerKey), findsOneWidget);

      // Container have transitioned out after 300ms.
      await tester.pump(const Duration(milliseconds: 1));
      expect(find.byKey(containerKey), findsNothing);
    });

    testWidgets('reverseTransitionDuration can be customized', (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();
      await tester.pumpWidget(MaterialApp(
        onGenerateRoute: (RouteSettings settings) {
          return MaterialPageRoute<dynamic>(
            builder: (BuildContext context) {
1189
              return ElevatedButton(
1190
                onPressed: () {
1191
                  Navigator.of(context)!.push<void>(
1192
                    ModifiedReverseTransitionDurationRoute<void>(
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                      builder: (BuildContext innerContext) {
                        return Container(
                          key: containerKey,
                          color: Colors.green,
                        );
                      },
                      // modified value, default MaterialPageRoute transition duration should be 300ms.
                      reverseTransitionDuration: const Duration(milliseconds: 150),
                    ),
                  );
                },
                child: const Text('Open page'),
              );
            },
          );
        },
      ));

      // Open the new route.
1212
      await tester.tap(find.byType(ElevatedButton));
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      await tester.pumpAndSettle();
      expect(find.text('Open page'), findsNothing);
      expect(find.byKey(containerKey), findsOneWidget);

      // Pop the new route.
      tester.state<NavigatorState>(find.byType(Navigator)).pop();
      await tester.pump();
      expect(find.byKey(containerKey), findsOneWidget);

      // Container should be present halfway through the transition.
      await tester.pump(const Duration(milliseconds: 75));
      expect(find.byKey(containerKey), findsOneWidget);

      // Container should be present at the very end of the transition.
      await tester.pump(const Duration(milliseconds: 75));
      expect(find.byKey(containerKey), findsOneWidget);

      // Container have transitioned out after 150ms.
      await tester.pump(const Duration(milliseconds: 1));
      expect(find.byKey(containerKey), findsNothing);
    });

    testWidgets('custom reverseTransitionDuration does not result in interrupted animations', (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();
      await tester.pumpWidget(MaterialApp(
        theme: ThemeData(
          pageTransitionsTheme: const PageTransitionsTheme(
            builders: <TargetPlatform, PageTransitionsBuilder>{
              TargetPlatform.android: FadeUpwardsPageTransitionsBuilder(), // use a fade transition
            },
          ),
        ),
        onGenerateRoute: (RouteSettings settings) {
          return MaterialPageRoute<dynamic>(
            builder: (BuildContext context) {
1248
              return ElevatedButton(
1249
                onPressed: () {
1250
                  Navigator.of(context)!.push<void>(
1251
                    ModifiedReverseTransitionDurationRoute<void>(
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                      builder: (BuildContext innerContext) {
                        return Container(
                          key: containerKey,
                          color: Colors.green,
                        );
                      },
                      // modified value, default MaterialPageRoute transition duration should be 300ms.
                      reverseTransitionDuration: const Duration(milliseconds: 150),
                    ),
                  );
                },
                child: const Text('Open page'),
              );
            },
          );
        },
      ));

      // Open the new route.
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      await tester.tap(find.byType(ElevatedButton));
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      await tester.pump();
      await tester.pump(const Duration(milliseconds: 200)); // jump partway through the forward transition
      expect(find.byKey(containerKey), findsOneWidget);

      // Gets the opacity of the fade transition while animating forwards.
      final double topFadeTransitionOpacity = _getOpacity(containerKey, tester);

      // Pop the new route mid-transition.
      tester.state<NavigatorState>(find.byType(Navigator)).pop();
      await tester.pump();

      // Transition should not jump. In other words, the fade transition
      // opacity before and after animation changes directions should remain
      // the same.
      expect(_getOpacity(containerKey, tester), topFadeTransitionOpacity);

      // Reverse transition duration should be:
      // Forward transition elapsed time: 200ms / 300ms = 2 / 3
      // Reverse transition remaining time: 150ms * 2 / 3 = 100ms

      // Container should be present at the very end of the transition.
      await tester.pump(const Duration(milliseconds: 100));
      expect(find.byKey(containerKey), findsOneWidget);

      // Container have transitioned out after 100ms.
      await tester.pump(const Duration(milliseconds: 1));
      expect(find.byKey(containerKey), findsNothing);
    });
1300
  });
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  group('ModalRoute', () {
    testWidgets('default barrierCurve', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        home: Material(
          child: Builder(
            builder: (BuildContext context) {
              return Center(
1309
                child: ElevatedButton(
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                  child: const Text('X'),
                  onPressed: () {
1312
                    Navigator.of(context)!.push<void>(
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                      _TestDialogRouteWithCustomBarrierCurve<void>(
                        child: const Text('Hello World'),
                      )
                    );
                  },
                ),
              );
            }
          ),
        ),
      ));

      final CurveTween _defaultBarrierTween = CurveTween(curve: Curves.ease);
      int _getExpectedBarrierTweenAlphaValue(double t) {
        return Color.getAlphaFromOpacity(_defaultBarrierTween.transform(t));
      }

      await tester.tap(find.text('X'));
      await tester.pump();
      final Finder animatedModalBarrier = find.byType(AnimatedModalBarrier);
      expect(animatedModalBarrier, findsOneWidget);

1335
      Animation<Color?> modalBarrierAnimation;
1336 1337 1338 1339 1340 1341
      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(modalBarrierAnimation.value, Colors.transparent);

      await tester.pump(const Duration(milliseconds: 25));
      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(
1342
        modalBarrierAnimation.value!.alpha,
1343
        closeTo(_getExpectedBarrierTweenAlphaValue(0.25), 1),
1344 1345 1346 1347 1348
      );

      await tester.pump(const Duration(milliseconds: 25));
      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(
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        modalBarrierAnimation.value!.alpha,
1350
        closeTo(_getExpectedBarrierTweenAlphaValue(0.50), 1),
1351 1352 1353 1354 1355
      );

      await tester.pump(const Duration(milliseconds: 25));
      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(
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        modalBarrierAnimation.value!.alpha,
1357
        closeTo(_getExpectedBarrierTweenAlphaValue(0.75), 1),
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      );

      await tester.pumpAndSettle();
      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(modalBarrierAnimation.value, Colors.black);
    });

    testWidgets('custom barrierCurve', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        home: Material(
          child: Builder(
            builder: (BuildContext context) {
              return Center(
1371
                child: ElevatedButton(
1372 1373
                  child: const Text('X'),
                  onPressed: () {
1374
                    Navigator.of(context)!.push<void>(
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                      _TestDialogRouteWithCustomBarrierCurve<void>(
                        child: const Text('Hello World'),
                        barrierCurve: Curves.linear,
                      ),
                    );
                  },
                ),
              );
            },
          ),
        ),
      ));

      final CurveTween _customBarrierTween = CurveTween(curve: Curves.linear);
      int _getExpectedBarrierTweenAlphaValue(double t) {
        return Color.getAlphaFromOpacity(_customBarrierTween.transform(t));
      }

      await tester.tap(find.text('X'));
      await tester.pump();
      final Finder animatedModalBarrier = find.byType(AnimatedModalBarrier);
      expect(animatedModalBarrier, findsOneWidget);

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      Animation<Color?> modalBarrierAnimation;
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      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(modalBarrierAnimation.value, Colors.transparent);

      await tester.pump(const Duration(milliseconds: 25));
      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(
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        modalBarrierAnimation.value!.alpha,
1406
        closeTo(_getExpectedBarrierTweenAlphaValue(0.25), 1),
1407 1408 1409 1410 1411
      );

      await tester.pump(const Duration(milliseconds: 25));
      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(
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        modalBarrierAnimation.value!.alpha,
1413
        closeTo(_getExpectedBarrierTweenAlphaValue(0.50), 1),
1414 1415 1416 1417 1418
      );

      await tester.pump(const Duration(milliseconds: 25));
      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(
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        modalBarrierAnimation.value!.alpha,
1420
        closeTo(_getExpectedBarrierTweenAlphaValue(0.75), 1),
1421 1422 1423 1424 1425 1426
      );

      await tester.pumpAndSettle();
      modalBarrierAnimation = tester.widget<AnimatedModalBarrier>(animatedModalBarrier).color;
      expect(modalBarrierAnimation.value, Colors.black);
    });
1427

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    testWidgets('modal route semantics order', (WidgetTester tester) async {
      // Regression test for https://github.com/flutter/flutter/issues/46625.
      final SemanticsTester semantics = SemanticsTester(tester);
      await tester.pumpWidget(MaterialApp(
        home: Material(
          child: Builder(
            builder: (BuildContext context) {
              return Center(
1436
                child: ElevatedButton(
1437 1438
                  child: const Text('X'),
                  onPressed: () {
1439
                    Navigator.of(context)!.push<void>(
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                      _TestDialogRouteWithCustomBarrierCurve<void>(
                        child: const Text('Hello World'),
                        barrierLabel: 'test label',
                        barrierCurve: Curves.linear,
                      ),
                    );
                  },
                ),
              );
            },
          ),
        ),
      ));

      await tester.tap(find.text('X'));
      await tester.pumpAndSettle();
      expect(find.text('Hello World'), findsOneWidget);

      final TestSemantics expectedSemantics = TestSemantics.root(
        children: <TestSemantics>[
          TestSemantics.rootChild(
            id: 1,
            rect: TestSemantics.fullScreen,
            children: <TestSemantics>[
              TestSemantics(
                id: 6,
                rect: TestSemantics.fullScreen,
                children: <TestSemantics>[
                  TestSemantics(
                    id: 7,
                    rect: TestSemantics.fullScreen,
                    flags: <SemanticsFlag>[SemanticsFlag.scopesRoute],
                    children: <TestSemantics>[
                      TestSemantics(
                        id: 8,
                        label: 'Hello World',
                        rect: TestSemantics.fullScreen,
                        textDirection: TextDirection.ltr,
                      ),
                    ],
                  ),
                ],
              ),
              // Modal barrier is put after modal scope
              TestSemantics(
                id: 5,
                rect: TestSemantics.fullScreen,
                actions: <SemanticsAction>[SemanticsAction.tap],
                label: 'test label',
                textDirection: TextDirection.ltr,
              ),
            ],
          ),
        ],
      )
      ;

      expect(semantics, hasSemantics(expectedSemantics));
      semantics.dispose();
    }, variant: const TargetPlatformVariant(<TargetPlatform>{TargetPlatform.iOS}));

1501
    testWidgets('focus traverse correct when pop multiple page simultaneously', (WidgetTester tester) async {
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      // Regression test: https://github.com/flutter/flutter/issues/48903
      final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
      await tester.pumpWidget(MaterialApp(
        navigatorKey: navigatorKey,
        home: const Text('dummy1'),
      ));
      final Element textOnPageOne = tester.element(find.text('dummy1'));
      final FocusScopeNode focusNodeOnPageOne = FocusScope.of(textOnPageOne);
      expect(focusNodeOnPageOne.hasFocus, isTrue);

      // Pushes one page.
1513
      navigatorKey.currentState!.push<void>(
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        MaterialPageRoute<void>(
          builder: (BuildContext context) => const Text('dummy2'),
        )
      );
      await tester.pumpAndSettle();

      final Element textOnPageTwo = tester.element(find.text('dummy2'));
      final FocusScopeNode focusNodeOnPageTwo = FocusScope.of(textOnPageTwo);
      // The focus should be on second page.
      expect(focusNodeOnPageOne.hasFocus, isFalse);
      expect(focusNodeOnPageTwo.hasFocus, isTrue);

      // Pushes another page.
1527
      navigatorKey.currentState!.push<void>(
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        MaterialPageRoute<void>(
          builder: (BuildContext context) => const Text('dummy3'),
        )
      );
      await tester.pumpAndSettle();
      final Element textOnPageThree = tester.element(find.text('dummy3'));
      final FocusScopeNode focusNodeOnPageThree = FocusScope.of(textOnPageThree);
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      // The focus should be on third page.
      expect(focusNodeOnPageOne.hasFocus, isFalse);
      expect(focusNodeOnPageTwo.hasFocus, isFalse);
      expect(focusNodeOnPageThree.hasFocus, isTrue);

      // Pops two pages simultaneously.
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      navigatorKey.currentState!.popUntil((Route<void> route) => route.isFirst);
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      await tester.pumpAndSettle();
      // It should refocus page one after pops.
      expect(focusNodeOnPageOne.hasFocus, isTrue);
    });

1547
    testWidgets('focus traversal is correct when popping multiple pages simultaneously - with focused children', (WidgetTester tester) async {
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      // Regression test: https://github.com/flutter/flutter/issues/48903
      final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
      await tester.pumpWidget(MaterialApp(
        navigatorKey: navigatorKey,
        home: const Text('dummy1'),
      ));
      final Element textOnPageOne = tester.element(find.text('dummy1'));
      final FocusScopeNode focusNodeOnPageOne = FocusScope.of(textOnPageOne);
      expect(focusNodeOnPageOne.hasFocus, isTrue);

      // Pushes one page.
1559
      navigatorKey.currentState!.push<void>(
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          MaterialPageRoute<void>(
            builder: (BuildContext context) => const Material(child: TextField()),
          )
      );
      await tester.pumpAndSettle();

      final Element textOnPageTwo = tester.element(find.byType(TextField));
      final FocusScopeNode focusNodeOnPageTwo = FocusScope.of(textOnPageTwo);
      // The focus should be on second page.
      expect(focusNodeOnPageOne.hasFocus, isFalse);
      expect(focusNodeOnPageTwo.hasFocus, isTrue);

      // Move the focus to another node.
      focusNodeOnPageTwo.nextFocus();
      await tester.pumpAndSettle();
      expect(focusNodeOnPageTwo.hasFocus, isTrue);
      expect(focusNodeOnPageTwo.hasPrimaryFocus, isFalse);

      // Pushes another page.
1579
      navigatorKey.currentState!.push<void>(
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          MaterialPageRoute<void>(
            builder: (BuildContext context) => const Text('dummy3'),
          )
      );
      await tester.pumpAndSettle();
      final Element textOnPageThree = tester.element(find.text('dummy3'));
      final FocusScopeNode focusNodeOnPageThree = FocusScope.of(textOnPageThree);
1587 1588 1589 1590 1591 1592
      // The focus should be on third page.
      expect(focusNodeOnPageOne.hasFocus, isFalse);
      expect(focusNodeOnPageTwo.hasFocus, isFalse);
      expect(focusNodeOnPageThree.hasFocus, isTrue);

      // Pops two pages simultaneously.
1593
      navigatorKey.currentState!.popUntil((Route<void> route) => route.isFirst);
1594 1595 1596 1597
      await tester.pumpAndSettle();
      // It should refocus page one after pops.
      expect(focusNodeOnPageOne.hasFocus, isTrue);
    });
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    testWidgets('child with local history can be disposed', (WidgetTester tester) async {
      // Regression test: https://github.com/flutter/flutter/issues/52478
      await tester.pumpWidget(MaterialApp(
        home: WidgetWithLocalHistory(),
      ));

      final WidgetWithLocalHistoryState state = tester.state(find.byType(WidgetWithLocalHistory));
      state.addLocalHistory();
      // Waits for modal route to update its internal state;
      await tester.pump();

      // Pumps a new widget to dispose WidgetWithLocalHistory. This should cause
      // it to remove the local history entry from modal route during
      // finalizeTree.
      await tester.pumpWidget(const MaterialApp(
        home: Text('dummy'),
      ));
      // Waits for modal route to update its internal state;
      await tester.pump();
      expect(tester.takeException(), null);
    });
1620
  });
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641

  testWidgets('can be dismissed with escape keyboard shortcut', (WidgetTester tester) async {
    final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
    await tester.pumpWidget(MaterialApp(
      navigatorKey: navigatorKey,
      home: const Text('dummy1'),
    ));
    final Element textOnPageOne = tester.element(find.text('dummy1'));

    // Show a simple dialog
    showDialog<void>(
      context: textOnPageOne,
      builder: (BuildContext context) => const Text('dialog1'),
    );
    await tester.pumpAndSettle();
    expect(find.text('dialog1'), findsOneWidget);

    // Try to dismiss the dialog with the shortcut key
    await tester.sendKeyEvent(LogicalKeyboardKey.escape);
    await tester.pumpAndSettle();
    expect(find.text('dialog1'), findsNothing);
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
  });

  testWidgets('can not be dismissed with escape keyboard shortcut if barrier not dismissible', (WidgetTester tester) async {
    final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
    await tester.pumpWidget(MaterialApp(
      navigatorKey: navigatorKey,
      home: const Text('dummy1'),
    ));
    final Element textOnPageOne = tester.element(find.text('dummy1'));

    // Show a simple dialog
    showDialog<void>(
      context: textOnPageOne,
      barrierDismissible: false,
      builder: (BuildContext context) => const Text('dialog1'),
    );
    await tester.pumpAndSettle();
    expect(find.text('dialog1'), findsOneWidget);

    // Try to dismiss the dialog with the shortcut key
    await tester.sendKeyEvent(LogicalKeyboardKey.escape);
    await tester.pumpAndSettle();
    expect(find.text('dialog1'), findsOneWidget);
1665
  });
1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687

  testWidgets('ModalRoute.of works for void routes', (WidgetTester tester) async {
    final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
    await tester.pumpWidget(MaterialApp(
      navigatorKey: navigatorKey,
      home: const Text('home'),
    ));
    expect(find.text('page2'), findsNothing);

    navigatorKey.currentState!.push<void>(MaterialPageRoute<void>(
      builder: (BuildContext context) {
        return const Text('page2');
      }
    ));

    await tester.pumpAndSettle();
    expect(find.text('page2'), findsOneWidget);

    final ModalRoute<void>? parentRoute = ModalRoute.of<void>(tester.element(find.text('page2')));
    expect(parentRoute, isNotNull);
    expect(parentRoute, isA<MaterialPageRoute<void>>());
  });
1688
}
1689

1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
double _getOpacity(GlobalKey key, WidgetTester tester) {
  final Finder finder = find.ancestor(
    of: find.byKey(key),
    matching: find.byType(FadeTransition),
  );
  return tester.widgetList(finder).fold<double>(1.0, (double a, Widget widget) {
    final FadeTransition transition = widget as FadeTransition;
    return a * transition.opacity.value;
  });
}

class ModifiedReverseTransitionDurationRoute<T> extends MaterialPageRoute<T> {
  ModifiedReverseTransitionDurationRoute({
1703 1704 1705
    required WidgetBuilder builder,
    RouteSettings? settings,
    required this.reverseTransitionDuration,
1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716
    bool fullscreenDialog = false,
  }) : super(
         builder: builder,
         settings: settings,
         fullscreenDialog: fullscreenDialog,
       );

  @override
  final Duration reverseTransitionDuration;
}

1717 1718 1719 1720 1721 1722 1723 1724 1725
class MockPageRoute extends Fake implements PageRoute<dynamic> { }

class MockRoute extends Fake implements Route<dynamic> { }

class MockRouteAware extends Fake implements RouteAware {
  int didPushCount = 0;
  int didPushNextCount = 0;
  int didPopCount = 0;
  int didPopNextCount = 0;
1726

1727 1728 1729 1730
  @override
  void didPush() {
    didPushCount += 1;
  }
1731

1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
  @override
  void didPushNext() {
    didPushNextCount += 1;
  }

  @override
  void didPop() {
    didPopCount += 1;
  }

  @override
  void didPopNext() {
    didPopNextCount += 1;
  }
}
1747 1748

class TestPageRouteBuilder extends PageRouteBuilder<void> {
1749
  TestPageRouteBuilder({required RoutePageBuilder pageBuilder}) : super(pageBuilder: pageBuilder);
1750 1751 1752 1753 1754 1755

  @override
  Animation<double> createAnimation() {
    return CurvedAnimation(parent: super.createAnimation(), curve: Curves.easeOutExpo);
  }
}
1756 1757

class DialogObserver extends NavigatorObserver {
1758
  final List<ModalRoute<dynamic>> dialogRoutes = <ModalRoute<dynamic>>[];
1759 1760 1761
  int dialogCount = 0;

  @override
1762
  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
1763
    if (route.toString().contains('_DialogRoute')) {
1764
      dialogRoutes.add(route as ModalRoute<dynamic>);
1765 1766 1767 1768
      dialogCount++;
    }
    super.didPush(route, previousRoute);
  }
1769 1770

  @override
1771
  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
1772 1773 1774 1775 1776 1777
    if (route.toString().contains('_DialogRoute')) {
      dialogRoutes.removeLast();
      dialogCount--;
    }
    super.didPop(route, previousRoute);
  }
1778
}
1779 1780 1781

class _TestDialogRouteWithCustomBarrierCurve<T> extends PopupRoute<T> {
  _TestDialogRouteWithCustomBarrierCurve({
1782
    required Widget child,
1783
    this.barrierLabel,
1784
    Curve? barrierCurve,
1785 1786 1787 1788 1789 1790 1791 1792 1793
  }) : _barrierCurve = barrierCurve,
       _child = child;

  final Widget _child;

  @override
  bool get barrierDismissible => true;

  @override
1794
  final String? barrierLabel;
1795 1796 1797 1798 1799 1800 1801 1802 1803

  @override
  Color get barrierColor => Colors.black; // easier value to test against

  @override
  Curve get barrierCurve {
    if (_barrierCurve == null) {
      return super.barrierCurve;
    }
1804
    return _barrierCurve!;
1805
  }
1806
  final Curve? _barrierCurve;
1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819

  @override
  Duration get transitionDuration => const Duration(milliseconds: 100); // easier value to test against

  @override
  Widget buildPage(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation) {
    return Semantics(
      child: _child,
      scopesRoute: true,
      explicitChildNodes: true,
    );
  }
}
1820 1821 1822 1823 1824 1825 1826

class WidgetWithLocalHistory extends StatefulWidget {
  @override
  WidgetWithLocalHistoryState createState() => WidgetWithLocalHistoryState();
}

class WidgetWithLocalHistoryState extends State<WidgetWithLocalHistory> {
1827
  late LocalHistoryEntry _localHistory;
1828 1829

  void addLocalHistory() {
1830
    final ModalRoute<dynamic> route = ModalRoute.of(context)!;
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845
    _localHistory = LocalHistoryEntry();
    route.addLocalHistoryEntry(_localHistory);
  }

  @override
  void dispose() {
    super.dispose();
    _localHistory.remove();
  }

  @override
  Widget build(BuildContext context) {
    return const Text('dummy');
  }
}
1846 1847 1848 1849 1850

class TransitionDetector extends DefaultTransitionDelegate<void> {
  bool hasTransition = false;
  @override
  Iterable<RouteTransitionRecord> resolve({
1851 1852 1853
    required List<RouteTransitionRecord> newPageRouteHistory,
    required Map<RouteTransitionRecord?, RouteTransitionRecord> locationToExitingPageRoute,
    required Map<RouteTransitionRecord?, List<RouteTransitionRecord>> pageRouteToPagelessRoutes
1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864
  }) {
    hasTransition = true;
    return super.resolve(
      newPageRouteHistory: newPageRouteHistory,
      locationToExitingPageRoute: locationToExitingPageRoute,
      pageRouteToPagelessRoutes: pageRouteToPagelessRoutes
    );
  }
}

Widget buildNavigator({
1865 1866 1867 1868
  required List<Page<dynamic>> pages,
  required PopPageCallback onPopPage,
  GlobalKey<NavigatorState>? key,
  TransitionDelegate<dynamic>? transitionDelegate
1869 1870
}) {
  return MediaQuery(
1871
    data: MediaQueryData.fromWindow(WidgetsBinding.instance!.window),
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
    child: Localizations(
      locale: const Locale('en', 'US'),
      delegates: const <LocalizationsDelegate<dynamic>>[
        DefaultMaterialLocalizations.delegate,
        DefaultWidgetsLocalizations.delegate
      ],
      child: Directionality(
        textDirection: TextDirection.ltr,
        child: Navigator(
          key: key,
          pages: pages,
          onPopPage: onPopPage,
          transitionDelegate: transitionDelegate ?? const DefaultTransitionDelegate<dynamic>(),
        ),
      ),
    ),
  );
}