lib/web_ui/test/window_test.dart - mirrors/engine - Git at Google

 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'dart:async';
 import 'dart:html' as html;
 import 'dart:js_util' as js_util;

 import 'package:test/bootstrap/browser.dart';
 import 'package:test/test.dart';
 import 'package:ui/src/engine.dart' hide window;
 import 'package:ui/ui.dart' as ui;

 import 'engine/history_test.dart';
 import 'matchers.dart';

 const MethodCodec codec = JSONMethodCodec();

 Map<String, dynamic> _tagStateWithSerialCount(dynamic state, int serialCount) {
   return <String, dynamic> {
     'serialCount': serialCount,
     'state': state,
   };
 }

 void main() {
   internalBootstrapBrowserTest(() => testMain);
 }

 void testMain() {
   late EngineSingletonFlutterWindow window;

   setUp(() {
     ui.webOnlyInitializeEngine();
     window = EngineSingletonFlutterWindow(0, EnginePlatformDispatcher.instance);
   });

   tearDown(() async {
     await window.resetHistory();
   });

   test('window.defaultRouteName should not change', () async {
     final TestUrlStrategy strategy = TestUrlStrategy.fromEntry(
       const TestHistoryEntry('initial state', null, '/initial'),
     );
     await window.debugInitializeHistory(strategy, useSingle: true);
     expect(window.defaultRouteName, '/initial');

     // Changing the URL in the address bar later shouldn't affect [window.defaultRouteName].
     strategy.replaceState(null, '', '/newpath');
     expect(window.defaultRouteName, '/initial');
   });

   // window.defaultRouteName is now permanently decoupled from the history,
   // even in subsequent tests, because the PlatformDispatcher caches it.

   test('window.defaultRouteName should reset after navigation platform message',
       () async {
     await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
       // The URL here does not set the PlatformDispatcher's defaultRouteName,
       // since it got cached as soon as we read it above.
       const TestHistoryEntry('initial state', null, '/not-really-inital/THIS_IS_IGNORED'),
     ), useSingle: true);
     // Reading it multiple times should return the same value.
     expect(window.defaultRouteName, '/initial');
     expect(window.defaultRouteName, '/initial');

     final Completer<void> callback = Completer<void>();
     window.sendPlatformMessage(
       'flutter/navigation',
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeUpdated',
         <String, dynamic>{'routeName': '/bar'},
       )),
       (_) { callback.complete(); },
     );
     await callback.future;
     // After a navigation platform message, the PlatformDispatcher's
     // defaultRouteName resets to "/".
     expect(window.defaultRouteName, '/');
   });

   // window.defaultRouteName is now '/'.

   test('can switch history mode', () async {
     Completer<void> callback;
     await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
       const TestHistoryEntry('initial state', null, '/initial'),
     ), useSingle: false);
     expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());

     Future<void> check<T>(String method, Object? arguments) async {
       callback = Completer<void>();
       window.sendPlatformMessage(
         'flutter/navigation',
         const JSONMethodCodec().encodeMethodCall(MethodCall(method, arguments)),
         (_) { callback.complete(); },
       );
       await callback.future;
       expect(window.browserHistory, isA<T>());
     }

     // These may be initialized as `null`
     // See https://github.com/flutter/flutter/issues/83158#issuecomment-847483010
     await check<SingleEntryBrowserHistory>('selectSingleEntryHistory', null); // -> single
     await check<MultiEntriesBrowserHistory>('selectMultiEntryHistory', null); // -> multi
     await check<SingleEntryBrowserHistory>('selectSingleEntryHistory', <String, dynamic>{}); // -> single
     await check<MultiEntriesBrowserHistory>('selectMultiEntryHistory', <String, dynamic>{}); // -> multi
     await check<SingleEntryBrowserHistory>('routeUpdated', <String, dynamic>{'routeName': '/bar'}); // -> single
     await check<SingleEntryBrowserHistory>('routeInformationUpdated', <String, dynamic>{'location': '/bar'}); // does not change mode
     await check<MultiEntriesBrowserHistory>('selectMultiEntryHistory', <String, dynamic>{}); // -> multi
     await check<MultiEntriesBrowserHistory>('routeInformationUpdated', <String, dynamic>{'location': '/bar'}); // does not change mode
   });

   test('handleNavigationMessage throws for route update methods called with null arguments',
       () async {
     expect(() async {
       await window.handleNavigationMessage(
         const JSONMethodCodec().encodeMethodCall(const MethodCall(
           'routeUpdated',
           null, // boom
         ))
       );
     }, throwsAssertionError);

     expect(() async {
       await window.handleNavigationMessage(
         const JSONMethodCodec().encodeMethodCall(const MethodCall(
           'routeInformationUpdated',
           null, // boom
         ))
       );
     }, throwsAssertionError);
   });

   test('handleNavigationMessage execute request in order.', () async {
     // Start with multi entries.
     await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
       const TestHistoryEntry('initial state', null, '/initial'),
     ), useSingle: false);
     expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());
     final List<String> executionOrder = <String>[];
     window.handleNavigationMessage(
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'selectSingleEntryHistory',
         null,
       ))
     ).then<void>((bool data) {
       executionOrder.add('1');
     });
     window.handleNavigationMessage(
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'selectMultiEntryHistory',
         null,
       ))
     ).then<void>((bool data) {
       executionOrder.add('2');
     });
     window.handleNavigationMessage(
         const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'selectSingleEntryHistory',
         null,
       ))
     ).then<void>((bool data) {
       executionOrder.add('3');
     });
     await window.handleNavigationMessage(
         const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeInformationUpdated',
         // ignore: prefer_const_literals_to_create_immutables
         <String, dynamic>{
           'location': '/baz',
           'state': null,
         }, // boom
       ))
     ).then<void>((bool data) {
       executionOrder.add('4');
     });
     // The routeInformationUpdated should finish after the browser history
     // has been set to single entry.
     expect(executionOrder.length, 4);
     expect(executionOrder[0], '1');
     expect(executionOrder[1], '2');
     expect(executionOrder[2], '3');
     expect(executionOrder[3], '4');
   });

   test('should not throw when using nav1 and nav2 together',
       () async {
     await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
       const TestHistoryEntry('initial state', null, '/initial'),
     ), useSingle: false);
     expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());

     // routeUpdated resets the history type
     Completer<void> callback = Completer<void>();
     window.sendPlatformMessage(
       'flutter/navigation',
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeUpdated',
         // ignore: prefer_const_literals_to_create_immutables
         <String, dynamic>{'routeName': '/bar'},
       )),
       (_) { callback.complete(); },
     );
     await callback.future;
     expect(window.browserHistory, isA<SingleEntryBrowserHistory>());
     expect(window.browserHistory.urlStrategy!.getPath(), '/bar');

     // routeInformationUpdated does not
     callback = Completer<void>();
     window.sendPlatformMessage(
       'flutter/navigation',
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeInformationUpdated',
         // ignore: prefer_const_literals_to_create_immutables
         <String, dynamic>{
           'location': '/baz',
           'state': null,
         },
       )),
       (_) { callback.complete(); },
     );
     await callback.future;
     expect(window.browserHistory, isA<SingleEntryBrowserHistory>());
     expect(window.browserHistory.urlStrategy!.getPath(), '/baz');

     // they can be interleaved safely
     await window.handleNavigationMessage(
         const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeUpdated',
         // ignore: prefer_const_literals_to_create_immutables
         <String, dynamic>{'routeName': '/foo'},
       ))
     );
     expect(window.browserHistory, isA<SingleEntryBrowserHistory>());
     expect(window.browserHistory.urlStrategy!.getPath(), '/foo');
   });

   test('can replace in MultiEntriesBrowserHistory',
       () async {
     await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
       const TestHistoryEntry('initial state', null, '/initial'),
     ), useSingle: false);
     expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());

     Completer<void> callback = Completer<void>();
     window.sendPlatformMessage(
       'flutter/navigation',
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeInformationUpdated',
         // ignore: prefer_const_literals_to_create_immutables
         <String, dynamic>{
           'location': '/baz',
           'state': '/state',
         },
       )),
       (_) { callback.complete(); },
     );
     await callback.future;
     expect(window.browserHistory.urlStrategy!.getPath(), '/baz');
     expect(window.browserHistory.urlStrategy!.getState(), _tagStateWithSerialCount('/state', 1));

     callback = Completer<void>();
     window.sendPlatformMessage(
       'flutter/navigation',
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeInformationUpdated',
         // ignore: prefer_const_literals_to_create_immutables
         <String, dynamic>{
           'location': '/baz',
           'state': '/state1',
           'replace': true
         },
       )),
       (_) { callback.complete(); },
     );
     await callback.future;
     expect(window.browserHistory.urlStrategy!.getPath(), '/baz');
     expect(window.browserHistory.urlStrategy!.getState(), _tagStateWithSerialCount('/state1', 1));

     callback = Completer<void>();
     window.sendPlatformMessage(
       'flutter/navigation',
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeInformationUpdated',
         // ignore: prefer_const_literals_to_create_immutables
         <String, dynamic>{
           'location': '/foo',
           'state': '/foostate1',
         },
       )),
       (_) { callback.complete(); },
     );
     await callback.future;
     expect(window.browserHistory.urlStrategy!.getPath(), '/foo');
     expect(window.browserHistory.urlStrategy!.getState(), _tagStateWithSerialCount('/foostate1', 2));

     await window.browserHistory.back();
     expect(window.browserHistory.urlStrategy!.getPath(), '/baz');
     expect(window.browserHistory.urlStrategy!.getState(), _tagStateWithSerialCount('/state1', 1));
   });

   test('initialize browser history with default url strategy (single)', () async {
     // On purpose, we don't initialize history on the window. We want to let the
     // window to self-initialize when it receives a navigation message.

     // Without initializing history, the default route name should be
     // initialized to "/" in tests.
     expect(window.defaultRouteName, '/');

     final Completer<void> callback = Completer<void>();
     window.sendPlatformMessage(
       'flutter/navigation',
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeUpdated',
         // ignore: prefer_const_literals_to_create_immutables
         <String, dynamic>{'routeName': '/bar'},
       )),
       (_) { callback.complete(); },
     );
     await callback.future;
     expect(window.browserHistory, isA<SingleEntryBrowserHistory>());
     // The url strategy should've been set to the default, and the path
     // should've been correctly set to "/bar".
     expect(window.browserHistory.urlStrategy, isNot(isNull));
     expect(window.browserHistory.urlStrategy!.getPath(), '/bar');
   }, skip: true); // https://github.com/flutter/flutter/issues/50836

   test('initialize browser history with default url strategy (multiple)', () async {
     // On purpose, we don't initialize history on the window. We want to let the
     // window to self-initialize when it receives a navigation message.

     // Without initializing history, the default route name should be
     // initialized to "/" in tests.
     expect(window.defaultRouteName, '/');

     final Completer<void> callback = Completer<void>();
     window.sendPlatformMessage(
       'flutter/navigation',
       const JSONMethodCodec().encodeMethodCall(const MethodCall(
         'routeInformationUpdated',
         // ignore: prefer_const_literals_to_create_immutables
         <String, dynamic>{
           'location': '/baz',
           'state': null,
         },
       )),
       (_) { callback.complete(); },
     );
     await callback.future;
     expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());
     // The url strategy should've been set to the default, and the path
     // should've been correctly set to "/baz".
     expect(window.browserHistory.urlStrategy, isNot(isNull));
     expect(window.browserHistory.urlStrategy!.getPath(), '/baz');
   }, skip: true); // https://github.com/flutter/flutter/issues/50836

   test('can disable location strategy', () async {
     // Disable URL strategy.
     expect(() => jsSetUrlStrategy(null), returnsNormally);
     // History should be initialized.
     expect(window.browserHistory, isNotNull);
     // But without a URL strategy.
     expect(window.browserHistory.urlStrategy, isNull);
     // Current path is always "/" in this case.
     expect(window.browserHistory.currentPath, '/');

     // Perform some navigation operations.
     await routeInformationUpdated('/foo/bar', null);
     // Path should not be updated because URL strategy is disabled.
     expect(window.browserHistory.currentPath, '/');
   }, skip: true);

   test('js interop throws on wrong type', () {
     expect(() => jsSetUrlStrategy(123), throwsA(anything));
     expect(() => jsSetUrlStrategy('foo'), throwsA(anything));
     expect(() => jsSetUrlStrategy(false), throwsA(anything));
   });

   test('cannot set url strategy after it is initialized', () async {
     final TestUrlStrategy testStrategy = TestUrlStrategy.fromEntry(
       const TestHistoryEntry('initial state', null, '/'),
     );
     await window.debugInitializeHistory(testStrategy, useSingle: true);

     expect(() => jsSetUrlStrategy(null), throwsA(isAssertionError));
   });

   test('cannot set url strategy more than once', () async {
     // First time is okay.
     expect(() => jsSetUrlStrategy(null), returnsNormally);
     // Second time is not allowed.
     expect(() => jsSetUrlStrategy(null), throwsA(isAssertionError));
   });

   // Regression test for https://github.com/flutter/flutter/issues/77817
   test('window.locale(s) are not nullable', () {
     // If the getters were nullable, these expressions would result in compiler errors.
     ui.window.locale.countryCode;
     ui.window.locales.first.countryCode;
   });
 }

 void jsSetUrlStrategy(dynamic strategy) {
   js_util.callMethod(
     html.window,
     '_flutter_web_set_location_strategy',
     <dynamic>[strategy],
   );
 }
	// Copyright 2013 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'dart:async';
	import 'dart:html' as html;
	import 'dart:js_util' as js_util;

	import 'package:test/bootstrap/browser.dart';
	import 'package:test/test.dart';
	import 'package:ui/src/engine.dart' hide window;
	import 'package:ui/ui.dart' as ui;

	import 'engine/history_test.dart';
	import 'matchers.dart';

	const MethodCodec codec = JSONMethodCodec();

	Map<String, dynamic> _tagStateWithSerialCount(dynamic state, int serialCount) {
	return <String, dynamic> {
	'serialCount': serialCount,
	'state': state,
	};
	}

	void main() {
	internalBootstrapBrowserTest(() => testMain);
	}

	void testMain() {
	late EngineSingletonFlutterWindow window;

	setUp(() {
	ui.webOnlyInitializeEngine();
	window = EngineSingletonFlutterWindow(0, EnginePlatformDispatcher.instance);
	});

	tearDown(() async {
	await window.resetHistory();
	});

	test('window.defaultRouteName should not change', () async {
	final TestUrlStrategy strategy = TestUrlStrategy.fromEntry(
	const TestHistoryEntry('initial state', null, '/initial'),
	);
	await window.debugInitializeHistory(strategy, useSingle: true);
	expect(window.defaultRouteName, '/initial');

	// Changing the URL in the address bar later shouldn't affect [window.defaultRouteName].
	strategy.replaceState(null, '', '/newpath');
	expect(window.defaultRouteName, '/initial');
	});

	// window.defaultRouteName is now permanently decoupled from the history,
	// even in subsequent tests, because the PlatformDispatcher caches it.

	test('window.defaultRouteName should reset after navigation platform message',
	() async {
	await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
	// The URL here does not set the PlatformDispatcher's defaultRouteName,
	// since it got cached as soon as we read it above.
	const TestHistoryEntry('initial state', null, '/not-really-inital/THIS_IS_IGNORED'),
	), useSingle: true);
	// Reading it multiple times should return the same value.
	expect(window.defaultRouteName, '/initial');
	expect(window.defaultRouteName, '/initial');

	final Completer<void> callback = Completer<void>();
	window.sendPlatformMessage(
	'flutter/navigation',
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeUpdated',
	<String, dynamic>{'routeName': '/bar'},
	)),
	(_) { callback.complete(); },
	);
	await callback.future;
	// After a navigation platform message, the PlatformDispatcher's
	// defaultRouteName resets to "/".
	expect(window.defaultRouteName, '/');
	});

	// window.defaultRouteName is now '/'.

	test('can switch history mode', () async {
	Completer<void> callback;
	await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
	const TestHistoryEntry('initial state', null, '/initial'),
	), useSingle: false);
	expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());

	Future<void> check<T>(String method, Object? arguments) async {
	callback = Completer<void>();
	window.sendPlatformMessage(
	'flutter/navigation',
	const JSONMethodCodec().encodeMethodCall(MethodCall(method, arguments)),
	(_) { callback.complete(); },
	);
	await callback.future;
	expect(window.browserHistory, isA<T>());
	}

	// These may be initialized as `null`
	// See https://github.com/flutter/flutter/issues/83158#issuecomment-847483010
	await check<SingleEntryBrowserHistory>('selectSingleEntryHistory', null); // -> single
	await check<MultiEntriesBrowserHistory>('selectMultiEntryHistory', null); // -> multi
	await check<SingleEntryBrowserHistory>('selectSingleEntryHistory', <String, dynamic>{}); // -> single
	await check<MultiEntriesBrowserHistory>('selectMultiEntryHistory', <String, dynamic>{}); // -> multi
	await check<SingleEntryBrowserHistory>('routeUpdated', <String, dynamic>{'routeName': '/bar'}); // -> single
	await check<SingleEntryBrowserHistory>('routeInformationUpdated', <String, dynamic>{'location': '/bar'}); // does not change mode
	await check<MultiEntriesBrowserHistory>('selectMultiEntryHistory', <String, dynamic>{}); // -> multi
	await check<MultiEntriesBrowserHistory>('routeInformationUpdated', <String, dynamic>{'location': '/bar'}); // does not change mode
	});

	test('handleNavigationMessage throws for route update methods called with null arguments',
	() async {
	expect(() async {
	await window.handleNavigationMessage(
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeUpdated',
	null, // boom
	))
	);
	}, throwsAssertionError);

	expect(() async {
	await window.handleNavigationMessage(
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeInformationUpdated',
	null, // boom
	))
	);
	}, throwsAssertionError);
	});

	test('handleNavigationMessage execute request in order.', () async {
	// Start with multi entries.
	await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
	const TestHistoryEntry('initial state', null, '/initial'),
	), useSingle: false);
	expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());
	final List<String> executionOrder = <String>[];
	window.handleNavigationMessage(
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'selectSingleEntryHistory',
	null,
	))
	).then<void>((bool data) {
	executionOrder.add('1');
	});
	window.handleNavigationMessage(
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'selectMultiEntryHistory',
	null,
	))
	).then<void>((bool data) {
	executionOrder.add('2');
	});
	window.handleNavigationMessage(
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'selectSingleEntryHistory',
	null,
	))
	).then<void>((bool data) {
	executionOrder.add('3');
	});
	await window.handleNavigationMessage(
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeInformationUpdated',
	// ignore: prefer_const_literals_to_create_immutables
	<String, dynamic>{
	'location': '/baz',
	'state': null,
	}, // boom
	))
	).then<void>((bool data) {
	executionOrder.add('4');
	});
	// The routeInformationUpdated should finish after the browser history
	// has been set to single entry.
	expect(executionOrder.length, 4);
	expect(executionOrder[0], '1');
	expect(executionOrder[1], '2');
	expect(executionOrder[2], '3');
	expect(executionOrder[3], '4');
	});

	test('should not throw when using nav1 and nav2 together',
	() async {
	await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
	const TestHistoryEntry('initial state', null, '/initial'),
	), useSingle: false);
	expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());

	// routeUpdated resets the history type
	Completer<void> callback = Completer<void>();
	window.sendPlatformMessage(
	'flutter/navigation',
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeUpdated',
	// ignore: prefer_const_literals_to_create_immutables
	<String, dynamic>{'routeName': '/bar'},
	)),
	(_) { callback.complete(); },
	);
	await callback.future;
	expect(window.browserHistory, isA<SingleEntryBrowserHistory>());
	expect(window.browserHistory.urlStrategy!.getPath(), '/bar');

	// routeInformationUpdated does not
	callback = Completer<void>();
	window.sendPlatformMessage(
	'flutter/navigation',
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeInformationUpdated',
	// ignore: prefer_const_literals_to_create_immutables
	<String, dynamic>{
	'location': '/baz',
	'state': null,
	},
	)),
	(_) { callback.complete(); },
	);
	await callback.future;
	expect(window.browserHistory, isA<SingleEntryBrowserHistory>());
	expect(window.browserHistory.urlStrategy!.getPath(), '/baz');

	// they can be interleaved safely
	await window.handleNavigationMessage(
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeUpdated',
	// ignore: prefer_const_literals_to_create_immutables
	<String, dynamic>{'routeName': '/foo'},
	))
	);
	expect(window.browserHistory, isA<SingleEntryBrowserHistory>());
	expect(window.browserHistory.urlStrategy!.getPath(), '/foo');
	});

	test('can replace in MultiEntriesBrowserHistory',
	() async {
	await window.debugInitializeHistory(TestUrlStrategy.fromEntry(
	const TestHistoryEntry('initial state', null, '/initial'),
	), useSingle: false);
	expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());

	Completer<void> callback = Completer<void>();
	window.sendPlatformMessage(
	'flutter/navigation',
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeInformationUpdated',
	// ignore: prefer_const_literals_to_create_immutables
	<String, dynamic>{
	'location': '/baz',
	'state': '/state',
	},
	)),
	(_) { callback.complete(); },
	);
	await callback.future;
	expect(window.browserHistory.urlStrategy!.getPath(), '/baz');
	expect(window.browserHistory.urlStrategy!.getState(), _tagStateWithSerialCount('/state', 1));

	callback = Completer<void>();
	window.sendPlatformMessage(
	'flutter/navigation',
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeInformationUpdated',
	// ignore: prefer_const_literals_to_create_immutables
	<String, dynamic>{
	'location': '/baz',
	'state': '/state1',
	'replace': true
	},
	)),
	(_) { callback.complete(); },
	);
	await callback.future;
	expect(window.browserHistory.urlStrategy!.getPath(), '/baz');
	expect(window.browserHistory.urlStrategy!.getState(), _tagStateWithSerialCount('/state1', 1));

	callback = Completer<void>();
	window.sendPlatformMessage(
	'flutter/navigation',
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeInformationUpdated',
	// ignore: prefer_const_literals_to_create_immutables
	<String, dynamic>{
	'location': '/foo',
	'state': '/foostate1',
	},
	)),
	(_) { callback.complete(); },
	);
	await callback.future;
	expect(window.browserHistory.urlStrategy!.getPath(), '/foo');
	expect(window.browserHistory.urlStrategy!.getState(), _tagStateWithSerialCount('/foostate1', 2));

	await window.browserHistory.back();
	expect(window.browserHistory.urlStrategy!.getPath(), '/baz');
	expect(window.browserHistory.urlStrategy!.getState(), _tagStateWithSerialCount('/state1', 1));
	});

	test('initialize browser history with default url strategy (single)', () async {
	// On purpose, we don't initialize history on the window. We want to let the
	// window to self-initialize when it receives a navigation message.

	// Without initializing history, the default route name should be
	// initialized to "/" in tests.
	expect(window.defaultRouteName, '/');

	final Completer<void> callback = Completer<void>();
	window.sendPlatformMessage(
	'flutter/navigation',
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeUpdated',
	// ignore: prefer_const_literals_to_create_immutables
	<String, dynamic>{'routeName': '/bar'},
	)),
	(_) { callback.complete(); },
	);
	await callback.future;
	expect(window.browserHistory, isA<SingleEntryBrowserHistory>());
	// The url strategy should've been set to the default, and the path
	// should've been correctly set to "/bar".
	expect(window.browserHistory.urlStrategy, isNot(isNull));
	expect(window.browserHistory.urlStrategy!.getPath(), '/bar');
	}, skip: true); // https://github.com/flutter/flutter/issues/50836

	test('initialize browser history with default url strategy (multiple)', () async {
	// On purpose, we don't initialize history on the window. We want to let the
	// window to self-initialize when it receives a navigation message.

	// Without initializing history, the default route name should be
	// initialized to "/" in tests.
	expect(window.defaultRouteName, '/');

	final Completer<void> callback = Completer<void>();
	window.sendPlatformMessage(
	'flutter/navigation',
	const JSONMethodCodec().encodeMethodCall(const MethodCall(
	'routeInformationUpdated',
	// ignore: prefer_const_literals_to_create_immutables
	<String, dynamic>{
	'location': '/baz',
	'state': null,
	},
	)),
	(_) { callback.complete(); },
	);
	await callback.future;
	expect(window.browserHistory, isA<MultiEntriesBrowserHistory>());
	// The url strategy should've been set to the default, and the path
	// should've been correctly set to "/baz".
	expect(window.browserHistory.urlStrategy, isNot(isNull));
	expect(window.browserHistory.urlStrategy!.getPath(), '/baz');
	}, skip: true); // https://github.com/flutter/flutter/issues/50836

	test('can disable location strategy', () async {
	// Disable URL strategy.
	expect(() => jsSetUrlStrategy(null), returnsNormally);
	// History should be initialized.
	expect(window.browserHistory, isNotNull);
	// But without a URL strategy.
	expect(window.browserHistory.urlStrategy, isNull);
	// Current path is always "/" in this case.
	expect(window.browserHistory.currentPath, '/');

	// Perform some navigation operations.
	await routeInformationUpdated('/foo/bar', null);
	// Path should not be updated because URL strategy is disabled.
	expect(window.browserHistory.currentPath, '/');
	}, skip: true);

	test('js interop throws on wrong type', () {
	expect(() => jsSetUrlStrategy(123), throwsA(anything));
	expect(() => jsSetUrlStrategy('foo'), throwsA(anything));
	expect(() => jsSetUrlStrategy(false), throwsA(anything));
	});

	test('cannot set url strategy after it is initialized', () async {
	final TestUrlStrategy testStrategy = TestUrlStrategy.fromEntry(
	const TestHistoryEntry('initial state', null, '/'),
	);
	await window.debugInitializeHistory(testStrategy, useSingle: true);

	expect(() => jsSetUrlStrategy(null), throwsA(isAssertionError));
	});

	test('cannot set url strategy more than once', () async {
	// First time is okay.
	expect(() => jsSetUrlStrategy(null), returnsNormally);
	// Second time is not allowed.
	expect(() => jsSetUrlStrategy(null), throwsA(isAssertionError));
	});

	// Regression test for https://github.com/flutter/flutter/issues/77817
	test('window.locale(s) are not nullable', () {
	// If the getters were nullable, these expressions would result in compiler errors.
	ui.window.locale.countryCode;
	ui.window.locales.first.countryCode;
	});
	}

	void jsSetUrlStrategy(dynamic strategy) {
	js_util.callMethod(
	html.window,
	'_flutter_web_set_location_strategy',
	<dynamic>[strategy],
	);
	}