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This PR contributes to https://github.com/flutter/flutter/issues/130459 ### Description - Adds `examples/api/test/widgets/implicit_animations/animated_positioned.0_test.dart` test
92 lines
3.2 KiB
Dart
92 lines
3.2 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 'dart:ui';
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import 'package:flutter/material.dart';
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import 'package:flutter_api_samples/widgets/implicit_animations/animated_positioned.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(
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'AnimatedPositioned animates on tap',
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(WidgetTester tester) async {
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await tester.pumpWidget(
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const example.AnimatedPositionedExampleApp(),
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);
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final Finder positionedFinder = find.descendant(
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of: find.byType(AnimatedPositioned),
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matching: find.byType(Positioned),
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);
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const double beginWidth = 50.0;
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const double endWidth = 200.0;
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const double beginHeight = 200.0;
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const double endHeight = 50.0;
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const double beginTop = 150.0;
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const double endTop = 50.0;
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Positioned positioned = tester.widget(positionedFinder);
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expect(positioned.width, beginWidth);
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expect(positioned.height, beginHeight);
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expect(positioned.top, beginTop);
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// Tap on the 'Tap me' text to start the forward animation.
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await tester.tap(find.text('Tap me'));
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await tester.pump();
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positioned = tester.widget(positionedFinder);
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expect(positioned.width, beginWidth);
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expect(positioned.height, beginHeight);
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expect(positioned.top, beginTop);
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// Advance animation to the middle.
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await tester.pump(example.AnimatedPositionedExampleApp.duration ~/ 2);
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final double t =
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example.AnimatedPositionedExampleApp.curve.transform(0.5);
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positioned = tester.widget(positionedFinder);
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expect(positioned.width, lerpDouble(beginWidth, endWidth, t));
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expect(positioned.height, lerpDouble(beginHeight, endHeight, t));
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expect(positioned.top, lerpDouble(beginTop, endTop, t));
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// Advance animation to the end.
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await tester.pump(example.AnimatedPositionedExampleApp.duration ~/ 2);
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positioned = tester.widget(positionedFinder);
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expect(positioned.width, endWidth);
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expect(positioned.height, endHeight);
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expect(positioned.top, endTop);
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// Tap on the 'Tap me' text again to start the reverse animation.
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await tester.tap(find.text('Tap me'));
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await tester.pump();
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positioned = tester.widget(positionedFinder);
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expect(positioned.width, endWidth);
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expect(positioned.height, endHeight);
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expect(positioned.top, endTop);
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// Advance animation to the middle.
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await tester.pump(example.AnimatedPositionedExampleApp.duration ~/ 2);
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positioned = tester.widget(positionedFinder);
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expect(positioned.width, lerpDouble(endWidth, beginWidth, t));
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expect(positioned.height, lerpDouble(endHeight, beginHeight, t));
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expect(positioned.top, lerpDouble(endTop, beginTop, t));
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// Advance animation to the end.
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await tester.pump(example.AnimatedPositionedExampleApp.duration ~/ 2);
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positioned = tester.widget(positionedFinder);
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expect(positioned.width, beginWidth);
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expect(positioned.height, beginHeight);
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expect(positioned.top, beginTop);
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},
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);
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}
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