mirror of
https://github.com/flutter/flutter
synced 2024-10-13 03:32:55 +00:00
68 lines
2.7 KiB
Dart
68 lines
2.7 KiB
Dart
// Copyright 2017 The Chromium 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:async';
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import 'package:flutter_driver/flutter_driver.dart';
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import 'package:test/test.dart';
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final RegExp calibrationRegExp = new RegExp('Flutter frame rate is (.*)fps');
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final RegExp statsRegExp = new RegExp('Produced: (.*)fps\nConsumed: (.*)fps\nWidget builds: (.*)');
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const Duration samplingTime = const Duration(seconds: 3);
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Future<Null> main() async {
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group('texture suite', () {
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FlutterDriver driver;
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setUpAll(() async {
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driver = await FlutterDriver.connect();
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});
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// This test verifies that we can consume texture frames at a rate
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// close to the minimum of the rate at which they are produced
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// and Flutter's frame rate. It also verifies that we do not rebuild the
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// Widget tree during texture consumption. The test starts by measuring
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// Flutter's frame rate.
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test('texture rendering', () async {
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final SerializableFinder fab = find.byValueKey('fab');
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final SerializableFinder summary = find.byValueKey('summary');
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// Wait for calibration to complete and fab to appear.
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await driver.waitFor(fab, timeout: const Duration(seconds: 10));
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final String calibrationResult = await driver.getText(summary);
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final Match matchCalibration = calibrationRegExp.matchAsPrefix(calibrationResult);
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expect(matchCalibration, isNotNull);
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final double flutterFrameRate = double.parse(matchCalibration.group(1));
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// Texture frame stats at 0.5x Flutter frame rate
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await driver.tap(fab);
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await new Future<Null>.delayed(samplingTime);
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await driver.tap(fab);
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final String statsSlow = await driver.getText(summary);
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final Match matchSlow = statsRegExp.matchAsPrefix(statsSlow);
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expect(matchSlow, isNotNull);
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expect(double.parse(matchSlow.group(1)), closeTo(flutterFrameRate / 2.0, 5.0));
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expect(double.parse(matchSlow.group(2)), closeTo(flutterFrameRate / 2.0, 5.0));
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expect(int.parse(matchSlow.group(3)), 1);
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// Texture frame stats at 2.0x Flutter frame rate
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await driver.tap(fab);
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await new Future<Null>.delayed(samplingTime);
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await driver.tap(fab);
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final String statsFast = await driver.getText(summary);
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final Match matchFast = statsRegExp.matchAsPrefix(statsFast);
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expect(matchFast, isNotNull);
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expect(double.parse(matchFast.group(1)), closeTo(flutterFrameRate * 2.0, 5.0));
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expect(double.parse(matchFast.group(2)), closeTo(flutterFrameRate, 10.0));
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expect(int.parse(matchFast.group(3)), 1);
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});
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tearDownAll(() async {
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driver?.close();
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});
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});
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}
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