Flutter `showModalBottomSheet` Ticker 在测试期间未处理

Posted 2023-02-23

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【中文标题】Flutter `showModalBottomSheet` Ticker 在测试期间未处理【英文标题】：Flutter `showModalBottomSheet` Ticker was not disposed during tests 【发布时间】：2019-12-26 01:27:32 【问题描述】：

在编写 Flutter 小部件测试时，我遇到了一个错误，即在 showModalBottomSheet() 期间创建的 Ticker 没有被释放。

我想我明白如果我要实现自己的 Flutter 动画，我应该制作一个 AnimationController，我会在小部件 dispose 方法期间调用 AnimationController.dispose()。

但是，由于（我相信）AnimationController 被抽象出来以提供一些便利，所以我不确定在测试完成后在哪里或如何确保小部件被处理掉。

注意：代码有效，当我在模拟器/模拟器上进行测试时，模态底页很棒。我只是希望能够在testWidgets 测试中对其进行测试。

我查看了 showModalBottomSheet 文档https://api.flutter.dev/flutter/material/showModalBottomSheet.html，但这仅显示了如何使用该功能。我没有找到任何方法来控制何时可以处理动画。

test_test.dart

（额外的pump() 以防异步问题，但似乎没有帮助）

testWidgets('Taping edit score button brings up bottom sheet to edit',
      (WidgetTester tester) async 
    setUp();
    await tester.pumpWidget(MaterialApp(
      home: GameList(
        game: Game(players: players),
      ),
    ));
    await tester.tap(find.byKey(Key('p1-edit-score')));
    await tester.pump();
    await tester.pump();
    expect(find.byKey(Key('test')), findsOneWidget);
    await tester.tap(find.byKey(Key('tap-me')));
    await tester.pump();
    await tester.pump();
    tearDown();
  );

game_view.dart


class GameView extends StatefulWidget 
  GameView(@required this.playerList, @required this.onResetPlayerScores);

  final Function onResetPlayerScores;
  final List<Player> playerList;

  @override
  _GameState createState() => _GameState();


class _GameState extends State<GameView> 
  @override
  Widget build(BuildContext context) 
    return Scaffold(
      appBar: AppBar(...),
      body: GameList(
        game: Game(players: widget.playerList),
      ),
    );

game_list.dart

为了简洁，去掉了一些小部件

class GameList extends StatefulWidget 
  GameList(@required this.game);

  final Game game;

  @override
  GameListState createState() => GameListState(game: game);


class GameListState extends State<GameList> 
  GameListState(@required this.game);

  final Game game;

  @override
  Widget build(BuildContext context) 
    return ListView.separated(
      shrinkWrap: true,
      itemCount: game.players.length,
      itemBuilder: (BuildContext context, int index) 
        return Card(
          child: Column(
            children: <Widget>[
              ListTile(
                trailing: Text(
                  '$game.players[index].score.toInt()',
                ),
                title: Text(
                  '$game.players[index].name',
                ),
              ),
              Row(
                children: <Widget>[
                  FlatButton(
                    child: Icon(
                      Icons.edit,
                      color: Colors.grey[700],
                    ),
                    onPressed: () async 
                      _settingModalBottomSheet(context);
                    ,
                    key: Key(
                      '$game.players[index].name-edit-score',
                    ),
                  ),
                ],
              ),
            ],
          ),
        );
      ,
      separatorBuilder: (BuildContext context, int index) => const Divider(),
    );
  


void _settingModalBottomSheet(context) 
  showModalBottomSheet(
    context: context,
    builder: (BuildContext buildContext) 
      return Center(
        child: Container(
          child: Wrap(
            children: <Widget>[
              Text(
                'edit',
                key: Key('test'),
              ),
              ListTile(
                leading: Icon(Icons.edit),
                title: Text('Video'),
                onTap: () 
                  Navigator.pop(context, 'video');
                ,
                key: Key('tap-me'),
              ),
            ],
          ),
        ),
      );
    ,
  );

`flutter test` 的短输出。我认为最重要的部分。

OverlayState created a Ticker via its TickerProviderStateMixin, but at the time dispose() was called
on the mixin, that Ticker was still active. All Tickers must be disposed before calling
super.dispose(). Tickers used by AnimationControllers should be disposed by calling dispose() on the
AnimationController itself. Otherwise, the ticker will leak.

`flutter test`的完整输出

The following assertion was thrown while finalizing the widget tree:
OverlayState#bfe06(tickers: tracking 1 ticker, entries: [OverlayEntry#c26ee(opaque: false;
maintainState: false), OverlayEntry#7cd4f(opaque: false; maintainState: true),
OverlayEntry#d496e(opaque: false; maintainState: false), OverlayEntry#e9ad3(opaque: false;
maintainState: true)]) was disposed with an active Ticker.
OverlayState created a Ticker via its TickerProviderStateMixin, but at the time dispose() was called
on the mixin, that Ticker was still active. All Tickers must be disposed before calling
super.dispose(). Tickers used by AnimationControllers should be disposed by calling dispose() on the
AnimationController itself. Otherwise, the ticker will leak.
The offending ticker was: _WidgetTicker(created by OverlayState#bfe06(tickers: tracking 0 tickers,
entries: [OverlayEntry#c26ee(opaque: false; maintainState: false), OverlayEntry#7cd4f(opaque: false;
maintainState: true)]))
The stack trace when the _WidgetTicker was actually created was:
#0      new Ticker.<anonymous closure> (package:flutter/src/scheduler/ticker.dart:64:40)
#1      new Ticker (package:flutter/src/scheduler/ticker.dart:66:6)
#2      new _WidgetTicker (package:flutter/src/widgets/ticker_provider.dart:225:80)
#3      _OverlayState&State&TickerProviderStateMixin.createTicker
(package:flutter/src/widgets/ticker_provider.dart:161:34)
#4      new AnimationController (package:flutter/src/animation/animation_controller.dart:245:21)
#5      BottomSheet.createAnimationController
(package:flutter/src/material/bottom_sheet.dart:128:12)
#6      _ModalBottomSheetRoute.createAnimationController
(package:flutter/src/material/bottom_sheet.dart:356:40)
#7      TransitionRoute.install (package:flutter/src/widgets/routes.dart:176:19)
#8      ModalRoute.install (package:flutter/src/widgets/routes.dart:907:11)
#9      NavigatorState.push (package:flutter/src/widgets/navigator.dart:1754:11)
#10     Navigator.push (package:flutter/src/widgets/navigator.dart:1093:34)
#11     showModalBottomSheet (package:flutter/src/material/bottom_sheet.dart:427:20)
#12     _settingModalBottomSheet (package:score_keeper/game_list.dart:98:3)
#13     GameListState.build.<anonymous closure>.<anonymous closure>
(package:score_keeper/game_list.dart:65:23)
<asynchronous suspension>
#14     _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:635:14)
#15     _InkResponseState.build.<anonymous closure>
(package:flutter/src/material/ink_well.dart:711:32)
#16     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
#17     TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:365:11)
#18     TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:312:7)
#19     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
#20
_TestWidgetsFlutterBinding&BindingBase&ServicesBinding&SchedulerBinding&GestureBinding.handleEvent
(package:flutter/src/gestures/binding.dart:222:20)
#21
_TestWidgetsFlutterBinding&BindingBase&ServicesBinding&SchedulerBinding&GestureBinding.dispatchEvent
(package:flutter/src/gestures/binding.dart:198:22)
#22     TestWidgetsFlutterBinding.dispatchEvent (package:flutter_test/src/binding.dart:365:11)
#23     WidgetTester.sendEventToBinding.<anonymous closure>
(package:flutter_test/src/widget_tester.dart:458:15)
#25     WidgetTester.sendEventToBinding.<anonymous closure>
(package:flutter_test/src/widget_tester.dart:457:39)
#28     TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:69:41)
#29     WidgetTester.sendEventToBinding (package:flutter_test/src/widget_tester.dart:457:27)
#30     TestGesture.up.<anonymous closure> (package:flutter_test/src/test_pointer.dart:422:13)
#32     TestGesture.up.<anonymous closure> (package:flutter_test/src/test_pointer.dart:420:39)
#35     TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:69:41)
#36     TestGesture.up (package:flutter_test/src/test_pointer.dart:420:27)
#37     WidgetController.tapAt.<anonymous closure> (package:flutter_test/src/controller.dart:263:21)
#51     WidgetController.startGesture (package:flutter_test/src/controller.dart)
#75     AutomatedTestWidgetsFlutterBinding.runTest.<anonymous closure>
(package:flutter_test/src/binding.dart:1026:17)
#77     AutomatedTestWidgetsFlutterBinding.runTest.<anonymous closure>
(package:flutter_test/src/binding.dart:1014:35)
(elided 58 frames from class _FakeAsync, package dart:async, package dart:async-patch, and package
stack_trace)


When the exception was thrown, this was the stack:
#0      _OverlayState&State&TickerProviderStateMixin.dispose.<anonymous closure> (package:flutter/src/widgets/ticker_provider.dart:178:13)
#1      _OverlayState&State&TickerProviderStateMixin.dispose (package:flutter/src/widgets/ticker_provider.dart:191:6)
#2      StatefulElement.unmount (package:flutter/src/widgets/framework.dart:4107:12)
#3      _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1737:13)
#4      _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#5      ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#6      _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#7      _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#8      SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5080:14)
#9      _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#10     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#11     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#12     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#13     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#14     SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5080:14)
#15     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#16     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#17     SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5080:14)
#18     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#19     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#20     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#21     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#22     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#23     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#24     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#25     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#26     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#27     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#28     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#29     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#30     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#31     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#32     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#33     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#34     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#35     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#36     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#37     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#38     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#39     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#40     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#41     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#42     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#43     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#44     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#45     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#46     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#47     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#48     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#49     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#50     SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5080:14)
#51     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#52     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#53     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#54     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#55     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#56     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#57     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#58     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#59     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#60     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#61     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#62     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#63     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#64     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#65     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#66     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#67     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#68     SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:5080:14)
#69     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#70     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#71     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#72     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#73     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#74     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#75     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#76     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#77     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#78     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#79     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#80     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#81     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#82     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#83     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#84     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#85     _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1735:7)
#86     ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3955:14)
#87     _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1733:13)
#88     ListIterable.forEach (dart:_internal/iterable.dart:39:13)
#89     _InactiveElements._unmountAll (package:flutter/src/widgets/framework.dart:1746:25)
#90     BuildOwner.finalizeTree.<anonymous closure> (package:flutter/src/widgets/framework.dart:2426:27)
#91     BuildOwner.lockState (package:flutter/src/widgets/framework.dart:2258:15)
#92     BuildOwner.finalizeTree (package:flutter/src/widgets/framework.dart:2425:7)
#93     AutomatedTestWidgetsFlutterBinding.drawFrame (package:flutter_test/src/binding.dart:953:18)
#94     _TestWidgetsFlutterBinding&BindingBase&ServicesBinding&SchedulerBinding&GestureBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:285:5)
#95     _TestWidgetsFlutterBinding&BindingBase&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1016:15)
#96     _TestWidgetsFlutterBinding&BindingBase&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:958:9)
#97     AutomatedTestWidgetsFlutterBinding.scheduleWarmUpFrame (package:flutter_test/src/binding.dart:915:5)
#98     runApp (package:flutter/src/widgets/binding.dart:787:7)
#99     TestWidgetsFlutterBinding._runTestBody (package:flutter_test/src/binding.dart:637:7)
<asynchronous suspension>
#102    TestWidgetsFlutterBinding._runTest (package:flutter_test/src/binding.dart:613:14)
#103    AutomatedTestWidgetsFlutterBinding.runTest.<anonymous closure> (package:flutter_test/src/binding.dart:1010:24)
#109    AutomatedTestWidgetsFlutterBinding.runTest (package:flutter_test/src/binding.dart:1007:15)
#110    testWidgets.<anonymous closure> (package:flutter_test/src/widget_tester.dart:116:22)
#111    Declarer.test.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test_api/src/backend/declarer.dart:168:27)
<asynchronous suspension>
#112    Invoker.waitForOutstandingCallbacks.<anonymous closure> (package:test_api/src/backend/invoker.dart:250:15)
<asynchronous suspension>
#117    Invoker.waitForOutstandingCallbacks (package:test_api/src/backend/invoker.dart:247:5)
#118    Declarer.test.<anonymous closure>.<anonymous closure> (package:test_api/src/backend/declarer.dart:166:33)
#123    Declarer.test.<anonymous closure> (package:test_api/src/backend/declarer.dart:165:13)
<asynchronous suspension>
#124    Invoker._onRun.<anonymous closure>.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test_api/src/backend/invoker.dart:400:25)
<asynchronous suspension>
#138    _Timer._runTimers (dart:isolate-patch/timer_impl.dart:382:19)
#139    _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:416:5)
#140    _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:12)
(elided 28 frames from class _FakeAsync, package dart:async, package dart:async-patch, and package stack_trace)
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following message was thrown:
An animation is still running even after the widget tree was disposed.

There was one transient callback left. The stack trace for when it was registered is as follows:
── callback 72 ──
#0      new _FrameCallbackEntry.<anonymous closure> (package:flutter/src/scheduler/binding.dart:112:33)
#1      new _FrameCallbackEntry (package:flutter/src/scheduler/binding.dart:115:6)
#2      _TestWidgetsFlutterBinding&BindingBase&ServicesBinding&SchedulerBinding.scheduleFrameCallback (package:flutter/src/scheduler/binding.dart:459:49)
#3      Ticker.scheduleTick (package:flutter/src/scheduler/ticker.dart:243:46)
#4      Ticker.start (package:flutter/src/scheduler/ticker.dart:159:7)
#5      AnimationController._startSimulation (package:flutter/src/animation/animation_controller.dart:685:41)
#6      AnimationController._animateToInternal (package:flutter/src/animation/animation_controller.dart:590:12)
#7      AnimationController.forward (package:flutter/src/animation/animation_controller.dart:458:12)
#8      TransitionRoute.didPush (package:flutter/src/widgets/routes.dart:188:24)
#9      ModalRoute.didPush (package:flutter/src/widgets/routes.dart:917:18)
#10     NavigatorState.push (package:flutter/src/widgets/navigator.dart:1756:11)
#11     Navigator.push (package:flutter/src/widgets/navigator.dart:1093:34)
#12     showModalBottomSheet (package:flutter/src/material/bottom_sheet.dart:427:20)
#13     _settingModalBottomSheet (package:score_keeper/game_list.dart:98:3)
#14     GameListState.build.<anonymous closure>.<anonymous closure> (package:score_keeper/game_list.dart:65:23)
<asynchronous suspension>
#15     _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:635:14)
#16     _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:711:32)
#17     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
#18     TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:365:11)
#19     TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:312:7)
#20     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
#21     _TestWidgetsFlutterBinding&BindingBase&ServicesBinding&SchedulerBinding&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:222:20)
#22     _TestWidgetsFlutterBinding&BindingBase&ServicesBinding&SchedulerBinding&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22)
#23     TestWidgetsFlutterBinding.dispatchEvent (package:flutter_test/src/binding.dart:365:11)
#24     WidgetTester.sendEventToBinding.<anonymous closure> (package:flutter_test/src/widget_tester.dart:458:15)
#26     WidgetTester.sendEventToBinding.<anonymous closure> (package:flutter_test/src/widget_tester.dart:457:39)
#29     TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:69:41)
#30     WidgetTester.sendEventToBinding (package:flutter_test/src/widget_tester.dart:457:27)
#31     TestGesture.up.<anonymous closure> (package:flutter_test/src/test_pointer.dart:422:13)
#33     TestGesture.up.<anonymous closure> (package:flutter_test/src/test_pointer.dart:420:39)
#36     TestAsyncUtils.guard (package:flutter_test/src/test_async_utils.dart:69:41)
#37     TestGesture.up (package:flutter_test/src/test_pointer.dart:420:27)
#38     WidgetController.tapAt.<anonymous closure> (package:flutter_test/src/controller.dart:263:21)
#52     WidgetController.startGesture (package:flutter_test/src/controller.dart)
#76     AutomatedTestWidgetsFlutterBinding.runTest.<anonymous closure> (package:flutter_test/src/binding.dart:1026:17)
#78     AutomatedTestWidgetsFlutterBinding.runTest.<anonymous closure> (package:flutter_test/src/binding.dart:1014:35)
(elided 58 frames from class _FakeAsync, package dart:async, package dart:async-patch, and package stack_trace)
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following message was thrown:
Multiple exceptions (2) were detected during the running of the current test, and at least one was
unexpected.
════════════════════════════════════════════════════════════════════════════════════════════════════
00:04 +25 -1: /Users/tsustare/src/projects/flutter-score-keeper/score_keeper/test/game_view_test.dart: Taping edit score button brings up bottom sheet to edit [E]
  Test failed. See exception logs above.
  The test description was: Taping edit score button brings up bottom sheet to edit```

【问题讨论】：

【参考方案1】：

尝试点按不在底部工作表中的任何可见小部件，并在测试结束前触发一个框架。这将关闭底部工作表并在测试退出之前将其处理掉 AnimationContoller。

例如在测试结束时：

await tester.tap(find.byType(BackButtonIcon)); // any widget that isn't in the bottom sheet
await tester.pump();

【讨论】：

【参考方案2】：

我在测试时也有类似的行为。修改后解决

 await tester.pump();

为

 await tester.pumpAndSettle();

【讨论】：

这是最干净的解决方案！

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