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