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semantics_test.dart
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semantics_test.dart
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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
import 'semantics_tester.dart';
void main() {
setUp(() {
debugResetSemanticsIdCounter();
});
testWidgets('Semantics shutdown and restart', (WidgetTester tester) async {
SemanticsTester? semantics = SemanticsTester(tester);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
label: 'test1',
textDirection: TextDirection.ltr,
),
],
);
await tester.pumpWidget(
Semantics(
label: 'test1',
textDirection: TextDirection.ltr,
child: Container(),
),
);
expect(semantics, hasSemantics(
expectedSemantics,
ignoreTransform: true,
ignoreRect: true,
ignoreId: true,
));
semantics.dispose();
semantics = null;
expect(tester.binding.hasScheduledFrame, isFalse);
semantics = SemanticsTester(tester);
expect(tester.binding.hasScheduledFrame, isTrue);
await tester.pump();
expect(semantics, hasSemantics(
expectedSemantics,
ignoreTransform: true,
ignoreRect: true,
ignoreId: true,
));
semantics.dispose();
}, semanticsEnabled: false);
testWidgets('Semantics tag only applies to immediate child', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: ListView(
children: <Widget>[
SingleChildScrollView(
child: Column(
children: <Widget>[
Container(padding: const EdgeInsets.only(top: 20.0)),
const Text('label'),
],
),
),
],
),
),
);
expect(semantics, isNot(includesNodeWith(
flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
tags: <SemanticsTag>{RenderViewport.useTwoPaneSemantics},
)));
await tester.pump();
// Semantics should stay the same after a frame update.
expect(semantics, isNot(includesNodeWith(
flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
tags: <SemanticsTag>{RenderViewport.useTwoPaneSemantics},
)));
semantics.dispose();
}, semanticsEnabled: false);
testWidgets('Semantics tooltip', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
tooltip: 'test1',
textDirection: TextDirection.ltr,
),
],
);
await tester.pumpWidget(
Semantics(
tooltip: 'test1',
textDirection: TextDirection.ltr,
),
);
expect(semantics, hasSemantics(
expectedSemantics,
ignoreTransform: true,
ignoreRect: true,
ignoreId: true,
));
semantics.dispose();
});
testWidgets('Detach and reattach assert', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final GlobalKey key = GlobalKey();
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
label: 'test1',
child: Semantics(
key: key,
container: true,
label: 'test2a',
child: Container(),
),
),
));
expect(semantics, hasSemantics(
TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
label: 'test1',
children: <TestSemantics>[
TestSemantics(
label: 'test2a',
),
],
),
],
),
ignoreId: true,
ignoreRect: true,
ignoreTransform: true,
));
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
label: 'test1',
child: Semantics(
container: true,
label: 'middle',
child: Semantics(
key: key,
container: true,
label: 'test2b',
child: Container(),
),
),
),
));
expect(semantics, hasSemantics(
TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
label: 'test1',
children: <TestSemantics>[
TestSemantics(
label: 'middle',
children: <TestSemantics>[
TestSemantics(
label: 'test2b',
),
],
),
],
),
],
),
ignoreId: true,
ignoreRect: true,
ignoreTransform: true,
));
semantics.dispose();
});
testWidgets('Semantics and Directionality - RTL', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.rtl,
child: Semantics(
label: 'test1',
child: Container(),
),
),
);
expect(semantics, includesNodeWith(label: 'test1', textDirection: TextDirection.rtl));
semantics.dispose();
});
testWidgets('Semantics and Directionality - LTR', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
label: 'test1',
child: Container(),
),
),
);
expect(semantics, includesNodeWith(label: 'test1', textDirection: TextDirection.ltr));
semantics.dispose();
});
testWidgets('Semantics and Directionality - cannot override RTL with LTR', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
label: 'test1',
textDirection: TextDirection.ltr,
),
],
);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.rtl,
child: Semantics(
label: 'test1',
textDirection: TextDirection.ltr,
child: Container(),
),
),
);
expect(semantics, hasSemantics(expectedSemantics, ignoreTransform: true, ignoreRect: true, ignoreId: true));
semantics.dispose();
});
testWidgets('Semantics and Directionality - cannot override LTR with RTL', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
label: 'test1',
textDirection: TextDirection.rtl,
),
],
);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
label: 'test1',
textDirection: TextDirection.rtl,
child: Container(),
),
),
);
expect(semantics, hasSemantics(expectedSemantics, ignoreTransform: true, ignoreRect: true, ignoreId: true));
semantics.dispose();
});
testWidgets('Semantics label and hint', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
label: 'label',
hint: 'hint',
value: 'value',
child: Container(),
),
),
);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
label: 'label',
hint: 'hint',
value: 'value',
textDirection: TextDirection.ltr,
),
],
);
expect(semantics, hasSemantics(expectedSemantics, ignoreTransform: true, ignoreRect: true, ignoreId: true));
semantics.dispose();
});
testWidgets('Semantics hints can merge', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
container: true,
child: Column(
children: <Widget>[
Semantics(
hint: 'hint one',
),
Semantics(
hint: 'hint two',
),
],
),
),
),
);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
hint: 'hint one\nhint two',
textDirection: TextDirection.ltr,
),
],
);
expect(semantics, hasSemantics(expectedSemantics, ignoreTransform: true, ignoreRect: true, ignoreId: true));
semantics.dispose();
});
testWidgets('Semantics values do not merge', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
container: true,
child: Column(
children: <Widget>[
Semantics(
value: 'value one',
child: const SizedBox(
height: 10.0,
width: 10.0,
),
),
Semantics(
value: 'value two',
child: const SizedBox(
height: 10.0,
width: 10.0,
),
),
],
),
),
),
);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
children: <TestSemantics>[
TestSemantics(
value: 'value one',
textDirection: TextDirection.ltr,
),
TestSemantics(
value: 'value two',
textDirection: TextDirection.ltr,
),
],
),
],
);
expect(semantics, hasSemantics(expectedSemantics, ignoreTransform: true, ignoreRect: true, ignoreId: true));
semantics.dispose();
});
testWidgets('Semantics value and hint can merge', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
container: true,
child: Column(
children: <Widget>[
Semantics(
hint: 'hint',
),
Semantics(
value: 'value',
),
],
),
),
),
);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
hint: 'hint',
value: 'value',
textDirection: TextDirection.ltr,
),
],
);
expect(semantics, hasSemantics(expectedSemantics, ignoreTransform: true, ignoreRect: true, ignoreId: true));
semantics.dispose();
});
testWidgets('Semantics tagForChildren works', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
container: true,
tagForChildren: const SemanticsTag('custom tag'),
child: Column(
children: <Widget>[
Semantics(
container: true,
child: const Text('child 1'),
),
Semantics(
container: true,
child: const Text('child 2'),
),
],
),
),
),
);
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
children: <TestSemantics>[
TestSemantics(
label: 'child 1',
tags: <SemanticsTag>[const SemanticsTag('custom tag')],
textDirection: TextDirection.ltr,
),
TestSemantics(
label: 'child 2',
tags: <SemanticsTag>[const SemanticsTag('custom tag')],
textDirection: TextDirection.ltr,
),
],
),
],
);
expect(semantics, hasSemantics(expectedSemantics, ignoreTransform: true, ignoreRect: true, ignoreId: true));
semantics.dispose();
});
testWidgets('Semantics widget supports all actions', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final List<SemanticsAction> performedActions = <SemanticsAction>[];
await tester.pumpWidget(
Semantics(
container: true,
onDismiss: () => performedActions.add(SemanticsAction.dismiss),
onTap: () => performedActions.add(SemanticsAction.tap),
onLongPress: () => performedActions.add(SemanticsAction.longPress),
onScrollLeft: () => performedActions.add(SemanticsAction.scrollLeft),
onScrollRight: () => performedActions.add(SemanticsAction.scrollRight),
onScrollUp: () => performedActions.add(SemanticsAction.scrollUp),
onScrollDown: () => performedActions.add(SemanticsAction.scrollDown),
onIncrease: () => performedActions.add(SemanticsAction.increase),
onDecrease: () => performedActions.add(SemanticsAction.decrease),
onCopy: () => performedActions.add(SemanticsAction.copy),
onCut: () => performedActions.add(SemanticsAction.cut),
onPaste: () => performedActions.add(SemanticsAction.paste),
onMoveCursorForwardByCharacter: (bool _) => performedActions.add(SemanticsAction.moveCursorForwardByCharacter),
onMoveCursorBackwardByCharacter: (bool _) => performedActions.add(SemanticsAction.moveCursorBackwardByCharacter),
onSetSelection: (TextSelection _) => performedActions.add(SemanticsAction.setSelection),
onSetText: (String _) => performedActions.add(SemanticsAction.setText),
onDidGainAccessibilityFocus: () => performedActions.add(SemanticsAction.didGainAccessibilityFocus),
onDidLoseAccessibilityFocus: () => performedActions.add(SemanticsAction.didLoseAccessibilityFocus),
),
);
// ignore: deprecated_member_use
final Set<SemanticsAction> allActions = SemanticsAction.doNotUseWillBeDeletedWithoutWarningValuesAsList.toSet()
..remove(SemanticsAction.moveCursorForwardByWord)
..remove(SemanticsAction.moveCursorBackwardByWord)
..remove(SemanticsAction.customAction) // customAction is not user-exposed.
..remove(SemanticsAction.showOnScreen); // showOnScreen is not user-exposed
const int expectedId = 1;
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
id: expectedId,
rect: TestSemantics.fullScreen,
actions: allActions.fold<int>(0, (int previous, SemanticsAction action) => previous | action.index),
),
],
);
expect(semantics, hasSemantics(expectedSemantics));
// Do the actions work?
final SemanticsOwner semanticsOwner = tester.binding.pipelineOwner.semanticsOwner!;
int expectedLength = 1;
for (final SemanticsAction action in allActions) {
switch (action) {
case SemanticsAction.moveCursorBackwardByCharacter:
case SemanticsAction.moveCursorForwardByCharacter:
semanticsOwner.performAction(expectedId, action, true);
case SemanticsAction.setSelection:
semanticsOwner.performAction(expectedId, action, <dynamic, dynamic>{
'base': 4,
'extent': 5,
});
case SemanticsAction.setText:
semanticsOwner.performAction(expectedId, action, 'text');
case SemanticsAction.copy:
case SemanticsAction.customAction:
case SemanticsAction.cut:
case SemanticsAction.decrease:
case SemanticsAction.didGainAccessibilityFocus:
case SemanticsAction.didLoseAccessibilityFocus:
case SemanticsAction.dismiss:
case SemanticsAction.increase:
case SemanticsAction.longPress:
case SemanticsAction.moveCursorBackwardByWord:
case SemanticsAction.moveCursorForwardByWord:
case SemanticsAction.paste:
case SemanticsAction.scrollDown:
case SemanticsAction.scrollLeft:
case SemanticsAction.scrollRight:
case SemanticsAction.scrollUp:
case SemanticsAction.showOnScreen:
case SemanticsAction.tap:
semanticsOwner.performAction(expectedId, action);
}
expect(performedActions.length, expectedLength);
expect(performedActions.last, action);
expectedLength += 1;
}
semantics.dispose();
});
testWidgets('Semantics widget supports all flags', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
// Checked state and toggled state are mutually exclusive.
await tester.pumpWidget(
Semantics(
key: const Key('a'),
container: true,
explicitChildNodes: true,
// flags
enabled: true,
hidden: true,
checked: true,
selected: true,
button: true,
slider: true,
keyboardKey: true,
link: true,
textField: true,
readOnly: true,
focused: true,
focusable: true,
inMutuallyExclusiveGroup: true,
header: true,
obscured: true,
multiline: true,
scopesRoute: true,
namesRoute: true,
image: true,
liveRegion: true,
),
);
// ignore: deprecated_member_use
final List<SemanticsFlag> flags = SemanticsFlag.doNotUseWillBeDeletedWithoutWarningValuesAsList.toList();
flags
..remove(SemanticsFlag.hasToggledState)
..remove(SemanticsFlag.isToggled)
..remove(SemanticsFlag.hasImplicitScrolling)
..remove(SemanticsFlag.isCheckStateMixed);
TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
rect: TestSemantics.fullScreen,
flags: flags,
),
],
);
expect(semantics, hasSemantics(expectedSemantics, ignoreId: true));
await tester.pumpWidget(Semantics(
key: const Key('b'),
container: true,
scopesRoute: false,
));
expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
rect: TestSemantics.fullScreen,
flags: <SemanticsFlag>[],
),
],
);
expect(semantics, hasSemantics(expectedSemantics, ignoreId: true));
await tester.pumpWidget(
Semantics(
key: const Key('c'),
toggled: true,
),
);
expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
rect: TestSemantics.fullScreen,
flags: <SemanticsFlag>[
SemanticsFlag.hasToggledState,
SemanticsFlag.isToggled,
],
),
],
);
expect(semantics, hasSemantics(expectedSemantics, ignoreId: true));
await tester.pumpWidget(
Semantics(
key: const Key('a'),
container: true,
explicitChildNodes: true,
// flags
enabled: true,
hidden: true,
checked: false,
mixed: true,
selected: true,
button: true,
slider: true,
keyboardKey: true,
link: true,
textField: true,
readOnly: true,
focused: true,
focusable: true,
inMutuallyExclusiveGroup: true,
header: true,
obscured: true,
multiline: true,
scopesRoute: true,
namesRoute: true,
image: true,
liveRegion: true,
),
);
flags
..remove(SemanticsFlag.isChecked)
..add(SemanticsFlag.isCheckStateMixed);
semantics.dispose();
expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
rect: TestSemantics.fullScreen,
flags: flags,
),
],
);
expect(semantics, hasSemantics(expectedSemantics, ignoreId: true));
});
testWidgets('Actions can be replaced without triggering semantics update', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
int semanticsUpdateCount = 0;
final SemanticsHandle handle = tester.binding.pipelineOwner.ensureSemantics(
listener: () {
semanticsUpdateCount += 1;
},
);
final List<String> performedActions = <String>[];
await tester.pumpWidget(
Semantics(
container: true,
onTap: () => performedActions.add('first'),
),
);
const int expectedId = 1;
final TestSemantics expectedSemantics = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
id: expectedId,
rect: TestSemantics.fullScreen,
actions: SemanticsAction.tap.index,
),
],
);
final SemanticsOwner semanticsOwner = tester.binding.pipelineOwner.semanticsOwner!;
expect(semantics, hasSemantics(expectedSemantics));
semanticsOwner.performAction(expectedId, SemanticsAction.tap);
expect(semanticsUpdateCount, 1);
expect(performedActions, <String>['first']);
semanticsUpdateCount = 0;
performedActions.clear();
// Updating existing handler should not trigger semantics update
await tester.pumpWidget(
Semantics(
container: true,
onTap: () => performedActions.add('second'),
),
);
expect(semantics, hasSemantics(expectedSemantics));
semanticsOwner.performAction(expectedId, SemanticsAction.tap);
expect(semanticsUpdateCount, 0);
expect(performedActions, <String>['second']);
semanticsUpdateCount = 0;
performedActions.clear();
// Adding a handler works
await tester.pumpWidget(
Semantics(
container: true,
onTap: () => performedActions.add('second'),
onLongPress: () => performedActions.add('longPress'),
),
);
final TestSemantics expectedSemanticsWithLongPress = TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
id: expectedId,
rect: TestSemantics.fullScreen,
actions: SemanticsAction.tap.index | SemanticsAction.longPress.index,
),
],
);
expect(semantics, hasSemantics(expectedSemanticsWithLongPress));
semanticsOwner.performAction(expectedId, SemanticsAction.longPress);
expect(semanticsUpdateCount, 1);
expect(performedActions, <String>['longPress']);
semanticsUpdateCount = 0;
performedActions.clear();
// Removing a handler works
await tester.pumpWidget(
Semantics(
container: true,
onTap: () => performedActions.add('second'),
),
);
expect(semantics, hasSemantics(expectedSemantics));
expect(semanticsUpdateCount, 1);
handle.dispose();
semantics.dispose();
});
testWidgets('onTapHint and onLongPressHint create custom actions', (WidgetTester tester) async {
final SemanticsHandle semantics = tester.ensureSemantics();
await tester.pumpWidget(Semantics(
container: true,
onTap: () { },
onTapHint: 'test',
));
expect(tester.getSemantics(find.byType(Semantics)), matchesSemantics(
hasTapAction: true,
onTapHint: 'test',
));
await tester.pumpWidget(Semantics(
container: true,
onLongPress: () { },
onLongPressHint: 'foo',
));
expect(tester.getSemantics(find.byType(Semantics)), matchesSemantics(
hasLongPressAction: true,
onLongPressHint: 'foo',
));
semantics.dispose();
});
testWidgets('CustomSemanticsActions can be added to a Semantics widget', (WidgetTester tester) async {
final SemanticsHandle semantics = tester.ensureSemantics();
await tester.pumpWidget(Semantics(
container: true,
customSemanticsActions: <CustomSemanticsAction, VoidCallback>{
const CustomSemanticsAction(label: 'foo'): () { },
const CustomSemanticsAction(label: 'bar'): () { },
},
));
expect(tester.getSemantics(find.byType(Semantics)), matchesSemantics(
customActions: <CustomSemanticsAction>[
const CustomSemanticsAction(label: 'bar'),
const CustomSemanticsAction(label: 'foo'),
],
));
semantics.dispose();
});
testWidgets('Increased/decreased values are annotated', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
container: true,
value: '10s',
increasedValue: '11s',
decreasedValue: '9s',
onIncrease: () => () { },
onDecrease: () => () { },
),
),
);
expect(semantics, hasSemantics(TestSemantics.root(
children: <TestSemantics>[
TestSemantics.rootChild(
actions: SemanticsAction.increase.index | SemanticsAction.decrease.index,
textDirection: TextDirection.ltr,
value: '10s',
increasedValue: '11s',
decreasedValue: '9s',
),
],
), ignoreTransform: true, ignoreRect: true, ignoreId: true));
semantics.dispose();
});
testWidgets('Semantics widgets built in a widget tree are sorted properly', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
int semanticsUpdateCount = 0;
final SemanticsHandle handle = tester.binding.pipelineOwner.ensureSemantics(
listener: () {
semanticsUpdateCount += 1;
},
);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Semantics(
sortKey: const CustomSortKey(0.0),
explicitChildNodes: true,
child: Column(
children: <Widget>[
Semantics(sortKey: const CustomSortKey(3.0), child: const Text('Label 1')),
Semantics(sortKey: const CustomSortKey(2.0), child: const Text('Label 2')),
Semantics(
sortKey: const CustomSortKey(1.0),
explicitChildNodes: true,
child: Row(
children: <Widget>[
Semantics(sortKey: const OrdinalSortKey(3.0), child: const Text('Label 3')),
Semantics(sortKey: const OrdinalSortKey(2.0), child: const Text('Label 4')),
Semantics(sortKey: const OrdinalSortKey(1.0), child: const Text('Label 5')),
],
),
),
],
),
),
),
);
expect(semanticsUpdateCount, 1);
expect(semantics, hasSemantics(
TestSemantics.root(
children: <TestSemantics>[
TestSemantics(
id: 1,
children: <TestSemantics>[
TestSemantics(
id: 4,
children: <TestSemantics>[
TestSemantics(
id: 7,
label: r'Label 5',
textDirection: TextDirection.ltr,
),
TestSemantics(
id: 6,
label: r'Label 4',
textDirection: TextDirection.ltr,
),
TestSemantics(
id: 5,
label: r'Label 3',
textDirection: TextDirection.ltr,
),
],
),
TestSemantics(
id: 3,
label: r'Label 2',
textDirection: TextDirection.ltr,
),
TestSemantics(
id: 2,
label: r'Label 1',
textDirection: TextDirection.ltr,
),
],
),
],
),
ignoreTransform: true,
ignoreRect: true,
));
handle.dispose();
semantics.dispose();
});
testWidgets('Semantics widgets built with explicit sort orders are sorted properly', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
int semanticsUpdateCount = 0;
final SemanticsHandle handle = tester.binding.pipelineOwner.ensureSemantics(
listener: () {
semanticsUpdateCount += 1;
},
);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Row(
children: <Widget>[
Semantics(
sortKey: const CustomSortKey(3.0),
child: const Text('Label 1'),
),
Semantics(
sortKey: const CustomSortKey(1.0),
child: const Text('Label 2'),
),
Semantics(
sortKey: const CustomSortKey(2.0),
child: const Text('Label 3'),
),
],
),
),
);
expect(semanticsUpdateCount, 1);