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Add tests for animated_switcher.0.dart API example. (#149180)

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This PR contributes to https://github.com/flutter/flutter/issues/130459

### Description
- Adds tests for `examples/api/lib/widgets/animated_switcher/animated_switcher.0.dart`
This commit is contained in:
Kostia Sokolovskyi
2024-05-29 14:10:34 +02:00
committed by GitHub
parent 35ae519140
commit 60d32e4534
3 changed files with 101 additions and 2 deletions
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1
dev/bots/check_code_samples.dart
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@@ -378,7 +378,6 @@ final Set<String> _knownMissingTests = <String>{
'examples/api/test/widgets/nested_scroll_view/nested_scroll_view_state.0_test.dart',
'examples/api/test/widgets/scroll_position/scroll_metrics_notification.0_test.dart',
'examples/api/test/widgets/media_query/media_query_data.system_gesture_insets.0_test.dart',
'examples/api/test/widgets/animated_switcher/animated_switcher.0_test.dart',
'examples/api/test/widgets/animated_list/animated_list.0_test.dart',
'examples/api/test/widgets/focus_traversal/focus_traversal_group.0_test.dart',
'examples/api/test/widgets/focus_traversal/ordered_traversal_policy.0_test.dart',

3
examples/api/lib/widgets/animated_switcher/animated_switcher.0.dart
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@@ -23,7 +23,8 @@ class AnimatedSwitcherExample extends StatefulWidget {
const AnimatedSwitcherExample({super.key});
@override
State<AnimatedSwitcherExample> createState() => _AnimatedSwitcherExampleState();
State<AnimatedSwitcherExample> createState() =>
_AnimatedSwitcherExampleState();
}
class _AnimatedSwitcherExampleState extends State<AnimatedSwitcherExample> {

99
examples/api/test/widgets/animated_switcher/animated_switcher.0_test.dart Normal file
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@@ -0,0 +1,99 @@
// 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 'package:flutter/material.dart';
import 'package:flutter_api_samples/widgets/animated_switcher/animated_switcher.0.dart'
as example;
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('Increments counter on button tap', (WidgetTester tester) async {
await tester.pumpWidget(
const example.AnimatedSwitcherExampleApp(),
);
int counter = 0;
expect(find.text('$counter'), findsOneWidget);
while (counter < 10) {
// Tap on the button to increment the counter.
await tester.tap(
find.ancestor(
of: find.text('Increment'),
matching: find.byType(ElevatedButton),
),
);
await tester.pumpAndSettle();
counter += 1;
expect(find.text('${counter - 1}'), findsNothing);
expect(find.text('$counter'), findsOneWidget);
}
});
testWidgets('Animates counter change', (WidgetTester tester) async {
await tester.pumpWidget(
const example.AnimatedSwitcherExampleApp(),
);
// The animation duration defined in the example app.
const Duration animationDuration = Duration(milliseconds: 500);
final Finder zeroTransitionFinder = find.ancestor(
of: find.text('0'),
matching: find.byType(ScaleTransition),
);
final Finder oneTransitionFinder = find.ancestor(
of: find.text('1'),
matching: find.byType(ScaleTransition),
);
expect(zeroTransitionFinder, findsOneWidget);
ScaleTransition zeroTransition = tester.widget(zeroTransitionFinder);
expect(zeroTransition.scale.value, equals(1.0));
expect(oneTransitionFinder, findsNothing);
// Tap on the button to increment the counter.
await tester.tap(
find.ancestor(
of: find.text('Increment'),
matching: find.byType(ElevatedButton),
),
);
await tester.pump();
expect(zeroTransitionFinder, findsOneWidget);
zeroTransition = tester.widget(zeroTransitionFinder);
expect(zeroTransition.scale.value, equals(1.0));
expect(oneTransitionFinder, findsOneWidget);
ScaleTransition oneTransition = tester.widget(oneTransitionFinder);
expect(oneTransition.scale.value, equals(0.0));
// Advance animation to the middle.
await tester.pump(animationDuration ~/ 2);
expect(zeroTransitionFinder, findsOneWidget);
zeroTransition = tester.widget(zeroTransitionFinder);
expect(zeroTransition.scale.value, equals(0.5));
expect(oneTransitionFinder, findsOneWidget);
oneTransition = tester.widget(oneTransitionFinder);
expect(oneTransition.scale.value, equals(0.5));
// Advance animation to the end.
await tester.pump(animationDuration ~/ 2);
expect(zeroTransitionFinder, findsOneWidget);
zeroTransition = tester.widget(zeroTransitionFinder);
expect(zeroTransition.scale.value, equals(0.0));
expect(oneTransitionFinder, findsOneWidget);
oneTransition = tester.widget(oneTransitionFinder);
expect(oneTransition.scale.value, equals(1.0));
});
}