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Part of https://github.com/flutter/flutter/issues/153860 https://github.com/user-attachments/assets/8fd233da-d1b1-417a-8854-8d16c3ad195b https://github.com/user-attachments/assets/93197949-b962-483e-bb8f-02db5206674c https://github.com/user-attachments/assets/ad4f4091-6ed3-4a13-bcf3-f8572ce87481 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md
41 lines
1.4 KiB
Dart
41 lines
1.4 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:flutter_api_samples/widgets/keep_alive/keep_alive.0.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('The state is maintained for the even items', (WidgetTester tester) async {
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await tester.pumpWidget(const KeepAliveExampleApp());
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expect(find.text('Item 0: 0'), findsOne);
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expect(find.text('Item 1: 0'), findsOne);
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await tester.tap(find.widgetWithIcon(IconButton, Icons.add).first);
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await tester.tap(find.widgetWithIcon(IconButton, Icons.add).at(1));
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await tester.pump();
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expect(find.text('Item 0: 1'), findsOne);
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expect(find.text('Item 1: 1'), findsOne);
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// Scrolls all the way down to the bottom of the list.
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await tester.fling(find.byType(ListView), const Offset(0, -6000), 1000);
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await tester.pumpAndSettle();
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expect(find.text('Item 99: 0'), findsOne);
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// Scrolls all the way back to the top of the list.
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await tester.fling(find.byType(ListView), const Offset(0, 6000), 1000);
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await tester.pumpAndSettle();
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expect(find.text('Item 0: 1'), findsOne, reason: 'The state of item 0 should be maintained');
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expect(
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find.text('Item 1: 0'),
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findsOne,
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reason: 'The state of item 1 should not be maintained',
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);
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});
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}
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