lib/web_ui/test/keyboard_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.

 // @dart = 2.6
 import 'dart:html' as html;
 import 'dart:js_util' as js_util;
 import 'dart:typed_data';

 import 'package:quiver/testing/async.dart';
 import 'package:ui/src/engine.dart';
 import 'package:ui/ui.dart' as ui;

 import 'package:test/test.dart';

 void main() {
   group('Keyboard', () {
     /// Used to save and restore [ui.window.onPlatformMessage] after each test.
     ui.PlatformMessageCallback savedCallback;

     setUp(() {
       savedCallback = ui.window.onPlatformMessage;
     });

     tearDown(() {
       ui.window.onPlatformMessage = savedCallback;
     });

     test('initializes and disposes', () {
       expect(Keyboard.instance, isNull);
       Keyboard.initialize();
       expect(Keyboard.instance, isA<Keyboard>());
       Keyboard.instance.dispose();
       expect(Keyboard.instance, isNull);
     });

     test('dispatches keyup to flutter/keyevent channel', () {
       Keyboard.initialize();

       String channelReceived;
       Map<String, dynamic> dataReceived;
       ui.window.onPlatformMessage = (String channel, ByteData data,
           ui.PlatformMessageResponseCallback callback) {
         channelReceived = channel;
         dataReceived = const JSONMessageCodec().decodeMessage(data);
       };

       html.KeyboardEvent event;

       event = dispatchKeyboardEvent('keyup', key: 'SomeKey', code: 'SomeCode');

       expect(event.defaultPrevented, isFalse);
       expect(channelReceived, 'flutter/keyevent');
       expect(dataReceived, <String, dynamic>{
         'type': 'keyup',
         'keymap': 'web',
         'code': 'SomeCode',
         'key': 'SomeKey',
         'metaState': 0x0,
       });

       Keyboard.instance.dispose();
     },
         // TODO(nurhan): https://github.com/flutter/flutter/issues/50815
         skip: browserEngine == BrowserEngine.edge);

     test('dispatches keydown to flutter/keyevent channel', () {
       Keyboard.initialize();

       String channelReceived;
       Map<String, dynamic> dataReceived;
       ui.window.onPlatformMessage = (String channel, ByteData data,
           ui.PlatformMessageResponseCallback callback) {
         channelReceived = channel;
         dataReceived = const JSONMessageCodec().decodeMessage(data);
       };

       html.KeyboardEvent event;

       event =
           dispatchKeyboardEvent('keydown', key: 'SomeKey', code: 'SomeCode');

       expect(channelReceived, 'flutter/keyevent');
       expect(dataReceived, <String, dynamic>{
         'type': 'keydown',
         'keymap': 'web',
         'code': 'SomeCode',
         'key': 'SomeKey',
         'metaState': 0x0,
       });
       expect(event.defaultPrevented, isFalse);

       Keyboard.instance.dispose();
     },
         // TODO(nurhan): https://github.com/flutter/flutter/issues/50815
         skip: browserEngine == BrowserEngine.edge);

     test('dispatches correct meta state', () {
       Keyboard.initialize();

       Map<String, dynamic> dataReceived;
       ui.window.onPlatformMessage = (String channel, ByteData data,
           ui.PlatformMessageResponseCallback callback) {
         dataReceived = const JSONMessageCodec().decodeMessage(data);
       };

       html.KeyboardEvent event;

       event = dispatchKeyboardEvent(
         'keydown',
         key: 'SomeKey',
         code: 'SomeCode',
         isControlPressed: true,
       );
       expect(event.defaultPrevented, isFalse);
       expect(dataReceived, <String, dynamic>{
         'type': 'keydown',
         'keymap': 'web',
         'code': 'SomeCode',
         'key': 'SomeKey',
         //          ctrl
         'metaState': 0x4,
       });

       event = dispatchKeyboardEvent(
         'keydown',
         key: 'SomeKey',
         code: 'SomeCode',
         isShiftPressed: true,
         isAltPressed: true,
         isMetaPressed: true,
       );
       expect(event.defaultPrevented, isFalse);
       expect(dataReceived, <String, dynamic>{
         'type': 'keydown',
         'keymap': 'web',
         'code': 'SomeCode',
         'key': 'SomeKey',
         //          shift  alt   meta
         'metaState': 0x1 | 0x2 | 0x8,
       });

       Keyboard.instance.dispose();
     },
         // TODO(nurhan): https://github.com/flutter/flutter/issues/50815
         skip: browserEngine == BrowserEngine.edge);

     test('dispatches repeat events', () {
       Keyboard.initialize();

       List<Map<String, dynamic>> messages = <Map<String, dynamic>>[];
       ui.window.onPlatformMessage = (String channel, ByteData data,
           ui.PlatformMessageResponseCallback callback) {
         messages.add(const JSONMessageCodec().decodeMessage(data));
       };

       html.KeyboardEvent event;

       event = dispatchKeyboardEvent(
         'keydown',
         key: 'SomeKey',
         code: 'SomeCode',
         repeat: true,
       );
       expect(event.defaultPrevented, isFalse);

       event = dispatchKeyboardEvent(
         'keydown',
         key: 'SomeKey',
         code: 'SomeCode',
         repeat: true,
       );
       expect(event.defaultPrevented, isFalse);

       event = dispatchKeyboardEvent(
         'keydown',
         key: 'SomeKey',
         code: 'SomeCode',
         repeat: true,
       );
       expect(event.defaultPrevented, isFalse);

       final Map<String, dynamic> expectedMessage = <String, dynamic>{
         'type': 'keydown',
         'keymap': 'web',
         'code': 'SomeCode',
         'key': 'SomeKey',
         'metaState': 0,
       };
       expect(messages, <Map<String, dynamic>>[
         expectedMessage,
         expectedMessage,
         expectedMessage,
       ]);

       Keyboard.instance.dispose();
     },
         // TODO(nurhan): https://github.com/flutter/flutter/issues/50815
         skip: browserEngine == BrowserEngine.edge);

     test('stops dispatching events after dispose', () {
       Keyboard.initialize();

       int count = 0;
       ui.window.onPlatformMessage = (String channel, ByteData data,
           ui.PlatformMessageResponseCallback callback) {
         count += 1;
       };

       dispatchKeyboardEvent('keydown');
       expect(count, 1);
       dispatchKeyboardEvent('keyup');
       expect(count, 2);

       Keyboard.instance.dispose();
       expect(Keyboard.instance, isNull);

       // No more event dispatching.
       dispatchKeyboardEvent('keydown');
       expect(count, 2);
       dispatchKeyboardEvent('keyup');
       expect(count, 2);
     });

     test('prevents default when "Tab" is pressed', () {
       Keyboard.initialize();

       int count = 0;
       ui.window.onPlatformMessage = (String channel, ByteData data,
           ui.PlatformMessageResponseCallback callback) {
         count += 1;
       };

       final html.KeyboardEvent event = dispatchKeyboardEvent(
         'keydown',
         key: 'Tab',
         code: 'Tab',
       );

       expect(event.defaultPrevented, isTrue);
       expect(count, 1);

       Keyboard.instance.dispose();
     });

     test('keyboard events should be triggered on text fields', () {
       Keyboard.initialize();

       int count = 0;
       ui.window.onPlatformMessage = (String channel, ByteData data,
           ui.PlatformMessageResponseCallback callback) {
         count += 1;
       };

       useTextEditingElement((html.Element element) {
         final html.KeyboardEvent event = dispatchKeyboardEvent(
           'keydown',
           key: 'SomeKey',
           code: 'SomeCode',
           target: element,
         );

         expect(event.defaultPrevented, isFalse);
         expect(count, 1);
       });

       Keyboard.instance.dispose();
     });

     test('the "Tab" key should never be ignored', () {
       Keyboard.initialize();

       int count = 0;
       ui.window.onPlatformMessage = (String channel, ByteData data,
           ui.PlatformMessageResponseCallback callback) {
         count += 1;
       };

       useTextEditingElement((html.Element element) {
         final html.KeyboardEvent event = dispatchKeyboardEvent(
           'keydown',
           key: 'Tab',
           code: 'Tab',
           target: element,
         );

         expect(event.defaultPrevented, isTrue);
         expect(count, 1);
       });

       Keyboard.instance.dispose();
     });

     testFakeAsync(
       'synthesize keyup when shortcut is handled by the system',
       (FakeAsync async) {
         // This can happen when the user clicks `cmd+alt+i` to open devtools. Here
         // is the sequence we receive from the browser in such case:
         //
         // keydown(cmd) -> keydown(alt) -> keydown(i) -> keyup(alt) -> keyup(cmd)
         //
         // There's no `keyup(i)`. The web engine is expected to synthesize a
         // `keyup(i)` event.
         Keyboard.initialize();

         List<Map<String, dynamic>> messages = <Map<String, dynamic>>[];
         ui.window.onPlatformMessage = (String channel, ByteData data,
             ui.PlatformMessageResponseCallback callback) {
           messages.add(const JSONMessageCodec().decodeMessage(data));
         };

         dispatchKeyboardEvent(
           'keydown',
           key: 'Meta',
           code: 'MetaLeft',
           isMetaPressed: true,
         );
         dispatchKeyboardEvent(
           'keydown',
           key: 'Alt',
           code: 'AltLeft',
           isMetaPressed: true,
           isAltPressed: true,
         );
         dispatchKeyboardEvent(
           'keydown',
           key: 'i',
           code: 'KeyI',
           isMetaPressed: true,
           isAltPressed: true,
         );
         async.elapse(Duration(milliseconds: 10));
         dispatchKeyboardEvent(
           'keyup',
           key: 'Meta',
           code: 'MetaLeft',
           isAltPressed: true,
         );
         dispatchKeyboardEvent('keyup', key: 'Alt', code: 'AltLeft');
         // Notice no `keyup` for "i".

         expect(messages, <Map<String, dynamic>>[
           <String, dynamic>{
             'type': 'keydown',
             'keymap': 'web',
             'key': 'Meta',
             'code': 'MetaLeft',
             //           meta
             'metaState': 0x8,
           },
           <String, dynamic>{
             'type': 'keydown',
             'keymap': 'web',
             'key': 'Alt',
             'code': 'AltLeft',
             //           alt   meta
             'metaState': 0x2 | 0x8,
           },
           <String, dynamic>{
             'type': 'keydown',
             'keymap': 'web',
             'key': 'i',
             'code': 'KeyI',
             //           alt   meta
             'metaState': 0x2 | 0x8,
           },
           <String, dynamic>{
             'type': 'keyup',
             'keymap': 'web',
             'key': 'Meta',
             'code': 'MetaLeft',
             //           alt
             'metaState': 0x2,
           },
           <String, dynamic>{
             'type': 'keyup',
             'keymap': 'web',
             'key': 'Alt',
             'code': 'AltLeft',
             'metaState': 0x0,
           },
         ]);
         messages.clear();

         // Still too eary to synthesize a keyup event.
         async.elapse(Duration(milliseconds: 50));
         expect(messages, isEmpty);

         async.elapse(Duration(seconds: 3));
         expect(messages, <Map<String, dynamic>>[
           <String, dynamic>{
             'type': 'keyup',
             'keymap': 'web',
             'key': 'i',
             'code': 'KeyI',
             'metaState': 0x0,
           }
         ]);

         Keyboard.instance.dispose();
       },
     );

     testFakeAsync(
       'do not synthesize keyup when we receive repeat events',
       (FakeAsync async) {
         Keyboard.initialize();

         List<Map<String, dynamic>> messages = <Map<String, dynamic>>[];
         ui.window.onPlatformMessage = (String channel, ByteData data,
             ui.PlatformMessageResponseCallback callback) {
           messages.add(const JSONMessageCodec().decodeMessage(data));
         };

         dispatchKeyboardEvent(
           'keydown',
           key: 'Meta',
           code: 'MetaLeft',
           isMetaPressed: true,
         );
         dispatchKeyboardEvent(
           'keydown',
           key: 'Alt',
           code: 'AltLeft',
           isMetaPressed: true,
           isAltPressed: true,
         );
         dispatchKeyboardEvent(
           'keydown',
           key: 'i',
           code: 'KeyI',
           isMetaPressed: true,
           isAltPressed: true,
         );
         async.elapse(Duration(milliseconds: 10));
         dispatchKeyboardEvent(
           'keyup',
           key: 'Meta',
           code: 'MetaLeft',
           isAltPressed: true,
         );
         dispatchKeyboardEvent('keyup', key: 'Alt', code: 'AltLeft');
         // Notice no `keyup` for "i".

         messages.clear();

         // Spend more than 2 seconds sending repeat events and make sure no
         // keyup was synthesized.
         for (int i = 0; i < 20; i++) {
           async.elapse(Duration(milliseconds: 100));
           dispatchKeyboardEvent(
             'keydown',
             key: 'i',
             code: 'KeyI',
             repeat: true,
           );
         }

         // There should be no synthesized keyup.
         expect(messages, hasLength(20));
         for (int i = 0; i < 20; i++) {
           expect(messages[i], <String, dynamic>{
             'type': 'keydown',
             'keymap': 'web',
             'key': 'i',
             'code': 'KeyI',
             'metaState': 0x0,
           });
         }
         messages.clear();

         // When repeat events stop for a long-enough period of time, a keyup
         // should be synthesized.
         async.elapse(Duration(seconds: 3));
         expect(messages, <Map<String, dynamic>>[
           <String, dynamic>{
             'type': 'keyup',
             'keymap': 'web',
             'key': 'i',
             'code': 'KeyI',
             'metaState': 0x0,
           }
         ]);

         Keyboard.instance.dispose();
       },
     );

     testFakeAsync('do not synthesize keyup for meta keys', (FakeAsync async) {
       Keyboard.initialize();

       List<Map<String, dynamic>> messages = <Map<String, dynamic>>[];
       ui.window.onPlatformMessage = (String channel, ByteData data,
           ui.PlatformMessageResponseCallback callback) {
         messages.add(const JSONMessageCodec().decodeMessage(data));
       };

       dispatchKeyboardEvent(
         'keydown',
         key: 'Meta',
         code: 'MetaLeft',
         isMetaPressed: true,
       );
       dispatchKeyboardEvent(
         'keydown',
         key: 'Alt',
         code: 'AltLeft',
         isMetaPressed: true,
         isAltPressed: true,
       );
       dispatchKeyboardEvent(
         'keydown',
         key: 'i',
         code: 'KeyI',
         isMetaPressed: true,
         isAltPressed: true,
       );
       async.elapse(Duration(milliseconds: 10));
       dispatchKeyboardEvent(
         'keyup',
         key: 'Meta',
         code: 'MetaLeft',
         isAltPressed: true,
       );
       // Notice no `keyup` for "AltLeft" and "i".

       messages.clear();

       // There has been no repeat events for "AltLeft" nor "i". Only "i" should
       // synthesize a keyup event.
       async.elapse(Duration(seconds: 3));
       expect(messages, <Map<String, dynamic>>[
         <String, dynamic>{
           'type': 'keyup',
           'keymap': 'web',
           'key': 'i',
           'code': 'KeyI',
           //           alt
           'metaState': 0x2,
         }
       ]);

       Keyboard.instance.dispose();
     });
   });
 }

 typedef ElementCallback = void Function(html.Element element);

 void useTextEditingElement(ElementCallback callback) {
   final html.InputElement input = html.InputElement();
   input.classes.add(HybridTextEditing.textEditingClass);

   try {
     html.document.body.append(input);
     callback(input);
   } finally {
     input.remove();
   }
 }

 html.KeyboardEvent dispatchKeyboardEvent(
   String type, {
   html.EventTarget target,
   String key,
   String code,
   bool repeat = false,
   bool isShiftPressed = false,
   bool isAltPressed = false,
   bool isControlPressed = false,
   bool isMetaPressed = false,
 }) {
   target ??= html.window;

   final Function jsKeyboardEvent =
       js_util.getProperty(html.window, 'KeyboardEvent');
   final List<dynamic> eventArgs = <dynamic>[
     type,
     <String, dynamic>{
       'key': key,
       'code': code,
       'repeat': repeat,
       'shiftKey': isShiftPressed,
       'altKey': isAltPressed,
       'ctrlKey': isControlPressed,
       'metaKey': isMetaPressed,
       'bubbles': true,
       'cancelable': true,
     }
   ];
   final html.KeyboardEvent event =
       js_util.callConstructor(jsKeyboardEvent, js_util.jsify(eventArgs));
   target.dispatchEvent(event);

   return event;
 }

 typedef FakeAsyncTest = void Function(FakeAsync);

 void testFakeAsync(String description, FakeAsyncTest fn) {
   test(description, () {
     FakeAsync().run(fn);
   });
 }
	// 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.

	// @dart = 2.6
	import 'dart:html' as html;
	import 'dart:js_util' as js_util;
	import 'dart:typed_data';

	import 'package:quiver/testing/async.dart';
	import 'package:ui/src/engine.dart';
	import 'package:ui/ui.dart' as ui;

	import 'package:test/test.dart';

	void main() {
	group('Keyboard', () {
	/// Used to save and restore [ui.window.onPlatformMessage] after each test.
	ui.PlatformMessageCallback savedCallback;

	setUp(() {
	savedCallback = ui.window.onPlatformMessage;
	});

	tearDown(() {
	ui.window.onPlatformMessage = savedCallback;
	});

	test('initializes and disposes', () {
	expect(Keyboard.instance, isNull);
	Keyboard.initialize();
	expect(Keyboard.instance, isA<Keyboard>());
	Keyboard.instance.dispose();
	expect(Keyboard.instance, isNull);
	});

	test('dispatches keyup to flutter/keyevent channel', () {
	Keyboard.initialize();

	String channelReceived;
	Map<String, dynamic> dataReceived;
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	channelReceived = channel;
	dataReceived = const JSONMessageCodec().decodeMessage(data);
	};

	html.KeyboardEvent event;

	event = dispatchKeyboardEvent('keyup', key: 'SomeKey', code: 'SomeCode');

	expect(event.defaultPrevented, isFalse);
	expect(channelReceived, 'flutter/keyevent');
	expect(dataReceived, <String, dynamic>{
	'type': 'keyup',
	'keymap': 'web',
	'code': 'SomeCode',
	'key': 'SomeKey',
	'metaState': 0x0,
	});

	Keyboard.instance.dispose();
	},
	// TODO(nurhan): https://github.com/flutter/flutter/issues/50815
	skip: browserEngine == BrowserEngine.edge);

	test('dispatches keydown to flutter/keyevent channel', () {
	Keyboard.initialize();

	String channelReceived;
	Map<String, dynamic> dataReceived;
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	channelReceived = channel;
	dataReceived = const JSONMessageCodec().decodeMessage(data);
	};

	html.KeyboardEvent event;

	event =
	dispatchKeyboardEvent('keydown', key: 'SomeKey', code: 'SomeCode');

	expect(channelReceived, 'flutter/keyevent');
	expect(dataReceived, <String, dynamic>{
	'type': 'keydown',
	'keymap': 'web',
	'code': 'SomeCode',
	'key': 'SomeKey',
	'metaState': 0x0,
	});
	expect(event.defaultPrevented, isFalse);

	Keyboard.instance.dispose();
	},
	// TODO(nurhan): https://github.com/flutter/flutter/issues/50815
	skip: browserEngine == BrowserEngine.edge);

	test('dispatches correct meta state', () {
	Keyboard.initialize();

	Map<String, dynamic> dataReceived;
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	dataReceived = const JSONMessageCodec().decodeMessage(data);
	};

	html.KeyboardEvent event;

	event = dispatchKeyboardEvent(
	'keydown',
	key: 'SomeKey',
	code: 'SomeCode',
	isControlPressed: true,
	);
	expect(event.defaultPrevented, isFalse);
	expect(dataReceived, <String, dynamic>{
	'type': 'keydown',
	'keymap': 'web',
	'code': 'SomeCode',
	'key': 'SomeKey',
	// ctrl
	'metaState': 0x4,
	});

	event = dispatchKeyboardEvent(
	'keydown',
	key: 'SomeKey',
	code: 'SomeCode',
	isShiftPressed: true,
	isAltPressed: true,
	isMetaPressed: true,
	);
	expect(event.defaultPrevented, isFalse);
	expect(dataReceived, <String, dynamic>{
	'type': 'keydown',
	'keymap': 'web',
	'code': 'SomeCode',
	'key': 'SomeKey',
	// shift alt meta
	'metaState': 0x1 \| 0x2 \| 0x8,
	});

	Keyboard.instance.dispose();
	},
	// TODO(nurhan): https://github.com/flutter/flutter/issues/50815
	skip: browserEngine == BrowserEngine.edge);

	test('dispatches repeat events', () {
	Keyboard.initialize();

	List<Map<String, dynamic>> messages = <Map<String, dynamic>>[];
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	messages.add(const JSONMessageCodec().decodeMessage(data));
	};

	html.KeyboardEvent event;

	event = dispatchKeyboardEvent(
	'keydown',
	key: 'SomeKey',
	code: 'SomeCode',
	repeat: true,
	);
	expect(event.defaultPrevented, isFalse);

	event = dispatchKeyboardEvent(
	'keydown',
	key: 'SomeKey',
	code: 'SomeCode',
	repeat: true,
	);
	expect(event.defaultPrevented, isFalse);

	event = dispatchKeyboardEvent(
	'keydown',
	key: 'SomeKey',
	code: 'SomeCode',
	repeat: true,
	);
	expect(event.defaultPrevented, isFalse);

	final Map<String, dynamic> expectedMessage = <String, dynamic>{
	'type': 'keydown',
	'keymap': 'web',
	'code': 'SomeCode',
	'key': 'SomeKey',
	'metaState': 0,
	};
	expect(messages, <Map<String, dynamic>>[
	expectedMessage,
	expectedMessage,
	expectedMessage,
	]);

	Keyboard.instance.dispose();
	},
	// TODO(nurhan): https://github.com/flutter/flutter/issues/50815
	skip: browserEngine == BrowserEngine.edge);

	test('stops dispatching events after dispose', () {
	Keyboard.initialize();

	int count = 0;
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	count += 1;
	};

	dispatchKeyboardEvent('keydown');
	expect(count, 1);
	dispatchKeyboardEvent('keyup');
	expect(count, 2);

	Keyboard.instance.dispose();
	expect(Keyboard.instance, isNull);

	// No more event dispatching.
	dispatchKeyboardEvent('keydown');
	expect(count, 2);
	dispatchKeyboardEvent('keyup');
	expect(count, 2);
	});

	test('prevents default when "Tab" is pressed', () {
	Keyboard.initialize();

	int count = 0;
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	count += 1;
	};

	final html.KeyboardEvent event = dispatchKeyboardEvent(
	'keydown',
	key: 'Tab',
	code: 'Tab',
	);

	expect(event.defaultPrevented, isTrue);
	expect(count, 1);

	Keyboard.instance.dispose();
	});

	test('keyboard events should be triggered on text fields', () {
	Keyboard.initialize();

	int count = 0;
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	count += 1;
	};

	useTextEditingElement((html.Element element) {
	final html.KeyboardEvent event = dispatchKeyboardEvent(
	'keydown',
	key: 'SomeKey',
	code: 'SomeCode',
	target: element,
	);

	expect(event.defaultPrevented, isFalse);
	expect(count, 1);
	});

	Keyboard.instance.dispose();
	});

	test('the "Tab" key should never be ignored', () {
	Keyboard.initialize();

	int count = 0;
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	count += 1;
	};

	useTextEditingElement((html.Element element) {
	final html.KeyboardEvent event = dispatchKeyboardEvent(
	'keydown',
	key: 'Tab',
	code: 'Tab',
	target: element,
	);

	expect(event.defaultPrevented, isTrue);
	expect(count, 1);
	});

	Keyboard.instance.dispose();
	});

	testFakeAsync(
	'synthesize keyup when shortcut is handled by the system',
	(FakeAsync async) {
	// This can happen when the user clicks `cmd+alt+i` to open devtools. Here
	// is the sequence we receive from the browser in such case:
	//
	// keydown(cmd) -> keydown(alt) -> keydown(i) -> keyup(alt) -> keyup(cmd)
	//
	// There's no `keyup(i)`. The web engine is expected to synthesize a
	// `keyup(i)` event.
	Keyboard.initialize();

	List<Map<String, dynamic>> messages = <Map<String, dynamic>>[];
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	messages.add(const JSONMessageCodec().decodeMessage(data));
	};

	dispatchKeyboardEvent(
	'keydown',
	key: 'Meta',
	code: 'MetaLeft',
	isMetaPressed: true,
	);
	dispatchKeyboardEvent(
	'keydown',
	key: 'Alt',
	code: 'AltLeft',
	isMetaPressed: true,
	isAltPressed: true,
	);
	dispatchKeyboardEvent(
	'keydown',
	key: 'i',
	code: 'KeyI',
	isMetaPressed: true,
	isAltPressed: true,
	);
	async.elapse(Duration(milliseconds: 10));
	dispatchKeyboardEvent(
	'keyup',
	key: 'Meta',
	code: 'MetaLeft',
	isAltPressed: true,
	);
	dispatchKeyboardEvent('keyup', key: 'Alt', code: 'AltLeft');
	// Notice no `keyup` for "i".

	expect(messages, <Map<String, dynamic>>[
	<String, dynamic>{
	'type': 'keydown',
	'keymap': 'web',
	'key': 'Meta',
	'code': 'MetaLeft',
	// meta
	'metaState': 0x8,
	},
	<String, dynamic>{
	'type': 'keydown',
	'keymap': 'web',
	'key': 'Alt',
	'code': 'AltLeft',
	// alt meta
	'metaState': 0x2 \| 0x8,
	},
	<String, dynamic>{
	'type': 'keydown',
	'keymap': 'web',
	'key': 'i',
	'code': 'KeyI',
	// alt meta
	'metaState': 0x2 \| 0x8,
	},
	<String, dynamic>{
	'type': 'keyup',
	'keymap': 'web',
	'key': 'Meta',
	'code': 'MetaLeft',
	// alt
	'metaState': 0x2,
	},
	<String, dynamic>{
	'type': 'keyup',
	'keymap': 'web',
	'key': 'Alt',
	'code': 'AltLeft',
	'metaState': 0x0,
	},
	]);
	messages.clear();

	// Still too eary to synthesize a keyup event.
	async.elapse(Duration(milliseconds: 50));
	expect(messages, isEmpty);

	async.elapse(Duration(seconds: 3));
	expect(messages, <Map<String, dynamic>>[
	<String, dynamic>{
	'type': 'keyup',
	'keymap': 'web',
	'key': 'i',
	'code': 'KeyI',
	'metaState': 0x0,
	}
	]);

	Keyboard.instance.dispose();
	},
	);

	testFakeAsync(
	'do not synthesize keyup when we receive repeat events',
	(FakeAsync async) {
	Keyboard.initialize();

	List<Map<String, dynamic>> messages = <Map<String, dynamic>>[];
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	messages.add(const JSONMessageCodec().decodeMessage(data));
	};

	dispatchKeyboardEvent(
	'keydown',
	key: 'Meta',
	code: 'MetaLeft',
	isMetaPressed: true,
	);
	dispatchKeyboardEvent(
	'keydown',
	key: 'Alt',
	code: 'AltLeft',
	isMetaPressed: true,
	isAltPressed: true,
	);
	dispatchKeyboardEvent(
	'keydown',
	key: 'i',
	code: 'KeyI',
	isMetaPressed: true,
	isAltPressed: true,
	);
	async.elapse(Duration(milliseconds: 10));
	dispatchKeyboardEvent(
	'keyup',
	key: 'Meta',
	code: 'MetaLeft',
	isAltPressed: true,
	);
	dispatchKeyboardEvent('keyup', key: 'Alt', code: 'AltLeft');
	// Notice no `keyup` for "i".

	messages.clear();

	// Spend more than 2 seconds sending repeat events and make sure no
	// keyup was synthesized.
	for (int i = 0; i < 20; i++) {
	async.elapse(Duration(milliseconds: 100));
	dispatchKeyboardEvent(
	'keydown',
	key: 'i',
	code: 'KeyI',
	repeat: true,
	);
	}

	// There should be no synthesized keyup.
	expect(messages, hasLength(20));
	for (int i = 0; i < 20; i++) {
	expect(messages[i], <String, dynamic>{
	'type': 'keydown',
	'keymap': 'web',
	'key': 'i',
	'code': 'KeyI',
	'metaState': 0x0,
	});
	}
	messages.clear();

	// When repeat events stop for a long-enough period of time, a keyup
	// should be synthesized.
	async.elapse(Duration(seconds: 3));
	expect(messages, <Map<String, dynamic>>[
	<String, dynamic>{
	'type': 'keyup',
	'keymap': 'web',
	'key': 'i',
	'code': 'KeyI',
	'metaState': 0x0,
	}
	]);

	Keyboard.instance.dispose();
	},
	);

	testFakeAsync('do not synthesize keyup for meta keys', (FakeAsync async) {
	Keyboard.initialize();

	List<Map<String, dynamic>> messages = <Map<String, dynamic>>[];
	ui.window.onPlatformMessage = (String channel, ByteData data,
	ui.PlatformMessageResponseCallback callback) {
	messages.add(const JSONMessageCodec().decodeMessage(data));
	};

	dispatchKeyboardEvent(
	'keydown',
	key: 'Meta',
	code: 'MetaLeft',
	isMetaPressed: true,
	);
	dispatchKeyboardEvent(
	'keydown',
	key: 'Alt',
	code: 'AltLeft',
	isMetaPressed: true,
	isAltPressed: true,
	);
	dispatchKeyboardEvent(
	'keydown',
	key: 'i',
	code: 'KeyI',
	isMetaPressed: true,
	isAltPressed: true,
	);
	async.elapse(Duration(milliseconds: 10));
	dispatchKeyboardEvent(
	'keyup',
	key: 'Meta',
	code: 'MetaLeft',
	isAltPressed: true,
	);
	// Notice no `keyup` for "AltLeft" and "i".

	messages.clear();

	// There has been no repeat events for "AltLeft" nor "i". Only "i" should
	// synthesize a keyup event.
	async.elapse(Duration(seconds: 3));
	expect(messages, <Map<String, dynamic>>[
	<String, dynamic>{
	'type': 'keyup',
	'keymap': 'web',
	'key': 'i',
	'code': 'KeyI',
	// alt
	'metaState': 0x2,
	}
	]);

	Keyboard.instance.dispose();
	});
	});
	}

	typedef ElementCallback = void Function(html.Element element);

	void useTextEditingElement(ElementCallback callback) {
	final html.InputElement input = html.InputElement();
	input.classes.add(HybridTextEditing.textEditingClass);

	try {
	html.document.body.append(input);
	callback(input);
	} finally {
	input.remove();
	}
	}

	html.KeyboardEvent dispatchKeyboardEvent(
	String type, {
	html.EventTarget target,
	String key,
	String code,
	bool repeat = false,
	bool isShiftPressed = false,
	bool isAltPressed = false,
	bool isControlPressed = false,
	bool isMetaPressed = false,
	}) {
	target ??= html.window;

	final Function jsKeyboardEvent =
	js_util.getProperty(html.window, 'KeyboardEvent');
	final List<dynamic> eventArgs = <dynamic>[
	type,
	<String, dynamic>{
	'key': key,
	'code': code,
	'repeat': repeat,
	'shiftKey': isShiftPressed,
	'altKey': isAltPressed,
	'ctrlKey': isControlPressed,
	'metaKey': isMetaPressed,
	'bubbles': true,
	'cancelable': true,
	}
	];
	final html.KeyboardEvent event =
	js_util.callConstructor(jsKeyboardEvent, js_util.jsify(eventArgs));
	target.dispatchEvent(event);

	return event;
	}

	typedef FakeAsyncTest = void Function(FakeAsync);

	void testFakeAsync(String description, FakeAsyncTest fn) {
	test(description, () {
	FakeAsync().run(fn);
	});
	}