| // Copyright 2015 The Chromium 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_test/flutter_test.dart'; |
| import 'package:flutter/material.dart'; |
| |
| const double kHeight = 10.0; |
| const double kFlingOffset = kHeight * 20.0; |
| |
| void main() { |
| testWidgets('Flings don\'t stutter', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| new Directionality( |
| textDirection: TextDirection.ltr, |
| child: new ListView.builder( |
| itemBuilder: (BuildContext context, int index) { |
| return new Container(height: kHeight); |
| }, |
| ), |
| ), |
| ); |
| |
| double getCurrentOffset() { |
| return tester.state<ScrollableState>(find.byType(Scrollable)).position.pixels; |
| } |
| |
| await tester.fling(find.byType(ListView), const Offset(0.0, -kFlingOffset), 1000.0); |
| expect(getCurrentOffset(), kFlingOffset); |
| while (tester.binding.transientCallbackCount > 0) { |
| final double lastOffset = getCurrentOffset(); |
| await tester.pump(const Duration(milliseconds: 20)); |
| expect(getCurrentOffset(), greaterThan(lastOffset)); |
| } |
| }, skip: true); // see https://github.com/flutter/flutter/issues/5339 |
| } |