// 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 'dart:async'; import 'package:flutter_driver/flutter_driver.dart'; import 'package:test/test.dart' hide TypeMatcher, isInstanceOf; void main() { group('scrolling performance test', () { FlutterDriver driver; setUpAll(() async { driver = await FlutterDriver.connect(); await driver.waitUntilFirstFrameRasterized(); }); tearDownAll(() async { if (driver != null) driver.close(); }); Future<void> testScrollPerf(String listKey, String summaryName) async { // The slight initial delay avoids starting the timing during a // period of increased load on the device. Without this delay, the // benchmark has greater noise. // See: https://github.com/flutter/flutter/issues/19434 await Future<void>.delayed(const Duration(milliseconds: 250)); await driver.forceGC(); final Timeline timeline = await driver.traceAction(() async { // Find the scrollable stock list final SerializableFinder list = find.byValueKey(listKey); expect(list, isNotNull); // Scroll down for (int i = 0; i < 5; i += 1) { await driver.scroll(list, 0.0, -300.0, const Duration(milliseconds: 300)); await Future<void>.delayed(const Duration(milliseconds: 500)); } // Scroll up for (int i = 0; i < 5; i += 1) { await driver.scroll(list, 0.0, 300.0, const Duration(milliseconds: 300)); await Future<void>.delayed(const Duration(milliseconds: 500)); } }); final TimelineSummary summary = TimelineSummary.summarize(timeline); await summary.writeSummaryToFile(summaryName, pretty: true); await summary.writeTimelineToFile(summaryName, pretty: true); } test('complex_layout_scroll_perf', () async { await testScrollPerf('complex-scroll', 'complex_layout_scroll_perf'); }); test('tiles_scroll_perf', () async { await driver.tap(find.byTooltip('Open navigation menu')); await driver.tap(find.byValueKey('scroll-switcher')); await testScrollPerf('tiles-scroll', 'tiles_scroll_perf'); }); }); }