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| @license |
| Copyright (C) 2018 The Android Open Source Project |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
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| http://www.apache.org/licenses/LICENSE-2.0 |
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| distributed under the License is distributed on an "AS IS" BASIS, |
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| |
| <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes"> |
| <title>gr-jank-detector</title> |
| |
| <script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script> |
| <script src="../../../bower_components/web-component-tester/browser.js"></script> |
| <link rel="import" href="../../../test/common-test-setup.html"/> |
| |
| <script src="gr-jank-detector.js"></script> |
| |
| <script> |
| suite('gr-jank-detector tests', () => { |
| let sandbox; |
| let clock; |
| let instance; |
| |
| const NOW_TIME = 100; |
| |
| setup(() => { |
| sandbox = sinon.sandbox.create(); |
| clock = sinon.useFakeTimers(NOW_TIME); |
| instance = GrJankDetector; |
| instance._lastFrameTime = 0; |
| sandbox.stub(instance, '_requestAnimationFrame'); |
| }); |
| |
| teardown(() => { |
| sandbox.restore(); |
| }); |
| |
| test('start() installs frame callback', () => { |
| sandbox.stub(instance, '_detect'); |
| instance._requestAnimationFrame.callsArg(0); |
| instance.start(); |
| assert.isTrue(instance._detect.calledOnce); |
| }); |
| |
| test('measures fps', () => { |
| instance._detect(10); |
| instance._detect(30); |
| assert.equal(instance.fps, 50); |
| }); |
| |
| test('detects jank', () => { |
| let now = 10; |
| instance._detect(now); |
| const fastFrame = () => instance._detect(now += 20); |
| const slowFrame = () => instance._detect(now += 300); |
| fastFrame(); |
| assert.equal(instance.jank, 0); |
| _.times(4, slowFrame); |
| assert.equal(instance.jank, 0); |
| instance._requestAnimationFrame.reset(); |
| slowFrame(); |
| assert.equal(instance.jank, 1); |
| assert.isFalse(instance._requestAnimationFrame.called); |
| clock.tick(1000); |
| assert.isTrue(instance._requestAnimationFrame.called); |
| }); |
| }); |
| </script> |