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test-performance.js
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/**
* Copyright 2015 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import * as IniLoad from '../../src/ini-load';
import * as lolex from 'lolex';
import {Services} from '../../src/services';
import {VisibilityState} from '../../src/visibility-state';
import {getMode} from '../../src/mode';
import {installPerformanceService} from '../../src/service/performance-impl';
import {installRuntimeServices} from '../../src/service/core-services';
describes.realWin('performance', {amp: true}, env => {
let sandbox;
let perf;
let clock;
let win;
let ampdoc;
beforeEach(() => {
win = env.win;
sandbox = env.sandbox;
ampdoc = env.ampdoc;
clock = lolex.install({
target: win,
toFake: ['Date', 'setTimeout', 'clearTimeout'],
});
installPerformanceService(env.win);
perf = Services.performanceFor(env.win);
});
afterEach(() => {
clock.uninstall();
});
describe('when viewer is not ready', () => {
it('should queue up tick events', () => {
expect(perf.events_.length).to.equal(0);
perf.tick('start');
expect(perf.events_.length).to.equal(1);
perf.tick('startEnd');
expect(perf.events_.length).to.equal(2);
});
it('should map tickDelta to tick', () => {
expect(perf.events_.length).to.equal(0);
perf.tickDelta('test', 99);
expect(perf.events_.length).to.equal(1);
expect(perf.events_[0]).to.be.jsonEqual({
label: 'test',
delta: 99,
});
});
it('should map tickDelta to non-zero tick', () => {
let c = 0;
expect(perf.events_.length).to.equal(c);
perf.tickDelta('test1', 0);
expect(perf.events_.length).to.equal(c + 1);
expect(perf.events_[c]).to.be.jsonEqual({
label: 'test1',
delta: 0,
});
c++;
perf.tickDelta('test2', -1);
expect(perf.events_.length).to.equal(c + 1);
expect(perf.events_[c]).to.be.jsonEqual({
label: 'test2',
delta: 0,
});
c++;
perf.tickDelta('test3', 2);
expect(perf.events_.length).to.equal(c + 1);
expect(perf.events_[c]).to.be.jsonEqual({
label: 'test3',
delta: 2,
});
});
it('should have max 50 queued events', () => {
expect(perf.events_.length).to.equal(0);
for (let i = 0; i < 200; i++) {
perf.tick(`start${i}`);
}
expect(perf.events_.length).to.equal(50);
});
it(
'should add default optional relative start time on the ' +
'queued tick event',
() => {
clock.tick(150);
perf.tick('start0');
expect(perf.events_[0]).to.be.jsonEqual({
label: 'start0',
value: 150,
});
}
);
it('should drop events in the head of the queue', () => {
const tickTime = 100;
clock.tick(tickTime);
expect(perf.events_.length).to.equal(0);
for (let i = 0; i < 50; i++) {
perf.tick(`start${i}`);
}
expect(perf.events_.length).to.equal(50);
expect(perf.events_[0]).to.be.jsonEqual({
label: 'start0',
value: tickTime,
});
clock.tick(1);
perf.tick('start50');
expect(perf.events_[0]).to.be.jsonEqual({
label: 'start1',
value: tickTime,
});
expect(perf.events_[49]).to.be.jsonEqual({
label: 'start50',
value: tickTime + 1,
});
});
});
describe
.configure()
.skipFirefox()
.run('when viewer is ready,', () => {
let viewer;
let viewerSendMessageStub;
beforeEach(() => {
viewer = Services.viewerForDoc(ampdoc);
viewerSendMessageStub = sandbox.stub(viewer, 'sendMessage');
});
describe('config', () => {
it(
'should configure correctly when viewer is embedded and supports ' +
'csi',
() => {
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns('1');
sandbox.stub(viewer, 'isEmbedded').returns(true);
perf.coreServicesAvailable().then(() => {
expect(perf.isPerformanceTrackingOn()).to.be.true;
});
}
);
it(
'should configure correctly when viewer is embedded and does ' +
'NOT support csi',
() => {
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns('0');
sandbox.stub(viewer, 'isEmbedded').returns(true);
perf.coreServicesAvailable().then(() => {
expect(perf.isPerformanceTrackingOn()).to.be.false;
});
}
);
it(
'should configure correctly when viewer is embedded and does ' +
'NOT support csi',
() => {
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns(null);
sandbox.stub(viewer, 'isEmbedded').returns(true);
perf.coreServicesAvailable().then(() => {
expect(perf.isPerformanceTrackingOn()).to.be.false;
});
}
);
it('should configure correctly when viewer is not embedded', () => {
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns(null);
sandbox.stub(viewer, 'isEmbedded').returns(false);
perf.coreServicesAvailable().then(() => {
expect(perf.isPerformanceTrackingOn()).to.be.false;
});
});
});
describe('channel established', () => {
it('should flush events when channel is ready', () => {
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns(null);
sandbox.stub(viewer, 'whenMessagingReady').returns(Promise.resolve());
expect(perf.isMessagingReady_).to.be.false;
const promise = perf.coreServicesAvailable();
expect(perf.events_.length).to.equal(0);
perf.tick('start');
expect(perf.events_.length).to.equal(1);
perf.tick('startEnd');
expect(perf.events_.length).to.equal(2);
expect(perf.isMessagingReady_).to.be.false;
const flushSpy = sandbox.spy(perf, 'flush');
expect(flushSpy).to.have.callCount(0);
perf.flush();
expect(flushSpy).to.have.callCount(1);
expect(perf.events_.length).to.equal(2);
perf.isPerformanceTrackingOn_ = true;
clock.tick(1);
return promise.then(() => {
expect(perf.isMessagingReady_).to.be.true;
const msrCalls = viewerSendMessageStub.withArgs(
'tick',
sinon.match(arg => arg.label == 'msr')
);
expect(msrCalls).to.be.calledOnce;
expect(msrCalls.args[0][1]).to.be.jsonEqual({
label: 'msr',
delta: 1,
});
expect(flushSpy).to.have.callCount(5);
expect(perf.events_.length).to.equal(0);
});
});
});
describe('channel not established', () => {
it('should not flush anything', () => {
sandbox.stub(viewer, 'whenMessagingReady').returns(null);
expect(perf.isMessagingReady_).to.be.false;
expect(perf.events_.length).to.equal(0);
perf.tick('start');
expect(perf.events_.length).to.equal(1);
perf.tick('startEnd');
expect(perf.events_.length).to.equal(2);
expect(perf.isMessagingReady_).to.be.false;
const flushSpy = sandbox.spy(perf, 'flush');
expect(flushSpy).to.have.callCount(0);
perf.flush();
expect(flushSpy).to.have.callCount(1);
expect(perf.events_.length).to.equal(2);
return Promise.all([
perf.coreServicesAvailable(),
ampdoc.whenFirstVisible(),
]).then(() => {
expect(flushSpy).to.have.callCount(4);
expect(perf.isMessagingReady_).to.be.false;
const count = 5;
expect(perf.events_.length).to.equal(count);
});
});
});
describe('tickSinceVisible', () => {
let tickDeltaStub;
let firstVisibleTime;
beforeEach(() => {
tickDeltaStub = sandbox.stub(perf, 'tickDelta');
firstVisibleTime = null;
sandbox
.stub(ampdoc, 'getFirstVisibleTime')
.callsFake(() => firstVisibleTime);
});
it('should always be zero before viewer is set', () => {
clock.tick(10);
perf.tickSinceVisible('test');
expect(tickDeltaStub).to.have.been.calledOnce;
expect(tickDeltaStub.firstCall.args[1]).to.equal(0);
});
it('should always be zero before visible', () => {
perf.coreServicesAvailable();
clock.tick(10);
perf.tickSinceVisible('test');
expect(tickDeltaStub).to.have.been.calledOnce;
expect(tickDeltaStub.firstCall.args[1]).to.equal(0);
});
it('should calculate after visible', () => {
perf.coreServicesAvailable();
firstVisibleTime = 5;
clock.tick(10);
perf.tickSinceVisible('test');
expect(tickDeltaStub).to.have.been.calledOnce;
expect(tickDeltaStub.firstCall.args[1]).to.equal(5);
});
it('should be zero after visible but for earlier event', () => {
perf.coreServicesAvailable();
firstVisibleTime = 5;
// An earlier event, since event time (4) is less than visible time (5).
clock.tick(4);
perf.tickSinceVisible('test');
expect(tickDeltaStub).to.have.been.calledOnce;
expect(tickDeltaStub.firstCall.args[1]).to.equal(0);
});
});
describe('and performanceTracking is off', () => {
beforeEach(() => {
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns(null);
sandbox.stub(viewer, 'isEmbedded').returns(false);
});
it('should not forward queued ticks', () => {
perf.tick('start0');
clock.tick(1);
perf.tick('start1', 'start0');
expect(perf.events_.length).to.equal(2);
return perf.coreServicesAvailable().then(() => {
perf.flushQueuedTicks_();
perf.flush();
expect(perf.events_.length).to.equal(0);
expect(viewerSendMessageStub.withArgs('tick')).to.not.be.called;
expect(
viewerSendMessageStub.withArgs(
'sendCsi',
undefined,
/* cancelUnsent */ true
)
).to.not.be.called;
});
});
it('should ignore all calls to tick', () => {
perf.tick('start0');
return perf.coreServicesAvailable().then(() => {
expect(viewerSendMessageStub.withArgs('tick')).to.not.be.called;
});
});
it('should ignore all calls to flush', () => {
perf.tick('start0');
perf.flush();
return perf.coreServicesAvailable().then(() => {
expect(
viewerSendMessageStub.withArgs(
'sendCsi',
undefined,
/* cancelUnsent */ true
)
).to.not.be.called;
});
});
});
describe('and performanceTracking is on', () => {
beforeEach(() => {
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns('1');
sandbox.stub(viewer, 'isEmbedded').returns(true);
sandbox.stub(viewer, 'whenMessagingReady').returns(Promise.resolve());
});
it('should forward all queued tick events', () => {
perf.tick('start0');
clock.tick(1);
perf.tick('start1');
expect(perf.events_.length).to.equal(2);
return perf.coreServicesAvailable().then(() => {
expect(
viewerSendMessageStub.withArgs('tick').getCall(0).args[1]
).to.be.jsonEqual({
label: 'start0',
value: 0,
});
expect(
viewerSendMessageStub.withArgs('tick').getCall(1).args[1]
).to.be.jsonEqual({
label: 'start1',
value: 1,
});
expect(
viewerSendMessageStub.withArgs('tick').getCall(4).args[1]
).to.be.jsonEqual({
label: 'msr',
delta: 1,
});
});
});
it('should have no more queued tick events after flush', () => {
perf.tick('start0');
perf.tick('start1');
expect(perf.events_.length).to.equal(2);
return perf.coreServicesAvailable().then(() => {
expect(perf.events_.length).to.equal(0);
});
});
it('should forward tick events', () => {
return perf.coreServicesAvailable().then(() => {
clock.tick(100);
perf.tick('start0');
perf.tick('start1', 300);
expect(
viewerSendMessageStub.withArgs(
'tick',
sinon.match(arg => arg.label == 'start0')
).args[0][1]
).to.be.jsonEqual({
label: 'start0',
value: 100,
});
expect(
viewerSendMessageStub.withArgs(
'tick',
sinon.match(arg => arg.label == 'start1')
).args[0][1]
).to.be.jsonEqual({
label: 'start1',
delta: 300,
});
});
});
it('should call the flush callback', () => {
// Make sure "first visible" arrives after "channel ready".
const firstVisiblePromise = new Promise(() => {});
sandbox.stub(ampdoc, 'whenFirstVisible').returns(firstVisiblePromise);
expect(viewerSendMessageStub.withArgs('sendCsi')).to.have.callCount(
0
);
// coreServicesAvailable calls flush once.
return perf.coreServicesAvailable().then(() => {
expect(viewerSendMessageStub.withArgs('sendCsi')).to.have.callCount(
1
);
perf.flush();
expect(viewerSendMessageStub.withArgs('sendCsi')).to.have.callCount(
2
);
perf.flush();
expect(viewerSendMessageStub.withArgs('sendCsi')).to.have.callCount(
3
);
});
});
it('should flush with the story experiment enabled', () => {
const storyEl = win.document.createElement('amp-story');
const bodyEl = win.document.body;
bodyEl.insertBefore(storyEl, bodyEl.firstElementChild || null);
return perf.coreServicesAvailable().then(() => {
expect(viewerSendMessageStub.withArgs('sendCsi')).to.have.callCount(
1
);
const call = viewerSendMessageStub.withArgs('sendCsi').getCall(0);
expect(call.args[1]).to.have.property('ampexp');
expect(call.args[1].ampexp).to.contain('story');
});
});
});
});
it('should wait for visible resources', () => {
const resources = Services.resourcesForDoc(ampdoc);
sandbox.stub(resources, 'whenFirstPass').returns(Promise.resolve());
const whenContentIniLoadStub = sandbox
.stub(IniLoad, 'whenContentIniLoad')
.returns(Promise.resolve());
perf.resources_ = resources;
return perf.whenViewportLayoutComplete_().then(() => {
expect(whenContentIniLoadStub).to.be.calledWith(
perf.win.document.documentElement,
perf.win,
sinon.match(
arg =>
arg.left == 0 &&
arg.top == 0 &&
arg.width == perf.win.innerWidth &&
arg.height == perf.win.innerHeight
),
/* inPrerender */ true
);
});
});
describe('coreServicesAvailable', () => {
let tickSpy;
let viewer;
let viewerSendMessageStub;
let whenFirstVisiblePromise;
let whenFirstVisibleResolve;
let whenViewportLayoutCompletePromise;
let whenViewportLayoutCompleteResolve;
function stubHasBeenVisible(visibility) {
sandbox.stub(ampdoc, 'hasBeenVisible').returns(visibility);
}
function getPerformanceMarks() {
return win.performance.getEntriesByType('mark').map(entry => entry.name);
}
beforeEach(() => {
viewer = Services.viewerForDoc(ampdoc);
sandbox.stub(viewer, 'whenMessagingReady').returns(Promise.resolve());
viewerSendMessageStub = sandbox.stub(viewer, 'sendMessage');
tickSpy = sandbox.spy(perf, 'tick');
whenFirstVisiblePromise = new Promise(resolve => {
whenFirstVisibleResolve = resolve;
});
whenViewportLayoutCompletePromise = new Promise(resolve => {
whenViewportLayoutCompleteResolve = resolve;
});
sandbox.stub(ampdoc, 'whenFirstVisible').returns(whenFirstVisiblePromise);
sandbox
.stub(perf, 'whenViewportLayoutComplete_')
.returns(whenViewportLayoutCompletePromise);
return viewer.whenMessagingReady();
});
describe('document started in prerender', () => {
beforeEach(() => {
clock.tick(100);
stubHasBeenVisible(false);
return perf.coreServicesAvailable();
});
it('should call prerenderComplete on viewer', () => {
clock.tick(100);
whenFirstVisibleResolve();
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns('1');
sandbox.stub(viewer, 'isEmbedded').returns(true);
return ampdoc.whenFirstVisible().then(() => {
clock.tick(400);
whenViewportLayoutCompleteResolve();
return perf.whenViewportLayoutComplete_().then(() => {
expect(
viewerSendMessageStub.withArgs('prerenderComplete').firstCall
.args[1].value
).to.equal(400);
expect(getPerformanceMarks()).to.have.members([
'dr',
'ol',
'visible',
'ofv',
'pc',
]);
});
});
});
it('should call prerenderComplete on viewer even if csi is off', () => {
clock.tick(100);
whenFirstVisibleResolve();
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns(null);
return ampdoc.whenFirstVisible().then(() => {
clock.tick(400);
whenViewportLayoutCompleteResolve();
return perf.whenViewportLayoutComplete_().then(() => {
expect(
viewerSendMessageStub.withArgs('prerenderComplete').firstCall
.args[1].value
).to.equal(400);
});
});
});
it(
'should tick `pc` with delta=400 when user request document ' +
'to be visible before before first viewport completion',
() => {
clock.tick(100);
whenFirstVisibleResolve();
expect(tickSpy).to.have.callCount(3);
return ampdoc.whenFirstVisible().then(() => {
clock.tick(400);
expect(tickSpy).to.have.callCount(4);
whenViewportLayoutCompleteResolve();
return perf.whenViewportLayoutComplete_().then(() => {
expect(tickSpy).to.have.callCount(4);
expect(tickSpy.withArgs('ofv')).to.be.calledOnce;
return whenFirstVisiblePromise.then(() => {
expect(tickSpy).to.have.callCount(5);
expect(tickSpy.withArgs('pc')).to.be.calledOnce;
expect(Number(tickSpy.withArgs('pc').args[0][1])).to.equal(400);
});
});
});
}
);
it(
'should tick `pc` with `delta=0` when viewport is complete ' +
'before user request document to be visible',
() => {
clock.tick(300);
whenViewportLayoutCompleteResolve();
return perf.whenViewportLayoutComplete_().then(() => {
expect(tickSpy.withArgs('ol')).to.be.calledOnce;
expect(tickSpy.withArgs('pc')).to.have.callCount(0);
whenFirstVisibleResolve();
return whenFirstVisiblePromise.then(() => {
expect(tickSpy.withArgs('pc')).to.be.calledOnce;
expect(Number(tickSpy.withArgs('pc').args[0][1])).to.equal(0);
expect(getPerformanceMarks()).to.have.members([
'dr',
'ol',
'pc',
'visible',
'ofv',
]);
});
});
}
);
});
describe('document did not start in prerender', () => {
beforeEach(() => {
stubHasBeenVisible(true);
perf.coreServicesAvailable();
});
it('should call prerenderComplete on viewer', () => {
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns('1');
sandbox.stub(viewer, 'isEmbedded').returns(true);
clock.tick(300);
whenViewportLayoutCompleteResolve();
return perf.whenViewportLayoutComplete_().then(() => {
expect(
viewerSendMessageStub.withArgs('prerenderComplete').firstCall
.args[1].value
).to.equal(300);
expect(getPerformanceMarks()).to.deep.equal(['dr', 'ol', 'pc']);
});
});
it(
'should tick `pc` with `opt_value=undefined` when user requests ' +
'document to be visible',
() => {
clock.tick(300);
whenViewportLayoutCompleteResolve();
return perf.whenViewportLayoutComplete_().then(() => {
expect(tickSpy.withArgs('ol')).to.be.calledOnce;
expect(tickSpy.withArgs('pc')).to.be.calledOnce;
expect(tickSpy.withArgs('pc').args[0][2]).to.be.undefined;
expect(getPerformanceMarks()).to.deep.equal(['dr', 'ol', 'pc']);
});
}
);
});
});
});
describes.realWin('performance with experiment', {amp: true}, env => {
let win;
let perf;
let viewerSendMessageStub;
let sandbox;
beforeEach(() => {
win = env.win;
sandbox = env.sandbox;
const viewer = Services.viewerForDoc(env.ampdoc);
viewerSendMessageStub = sandbox.stub(viewer, 'sendMessage');
sandbox.stub(viewer, 'whenMessagingReady').returns(Promise.resolve());
sandbox
.stub(viewer, 'getParam')
.withArgs('csi')
.returns('1');
sandbox.stub(viewer, 'isEmbedded').returns(true);
installPerformanceService(win);
perf = Services.performanceFor(win);
});
it('rtvVersion experiment', () => {
return perf.coreServicesAvailable().then(() => {
viewerSendMessageStub.reset();
perf.flush();
expect(viewerSendMessageStub.lastCall.args[0]).to.equal('sendCsi');
expect(viewerSendMessageStub.lastCall.args[1].ampexp).to.equal(
'rtv-' + getMode(win).rtvVersion
);
});
});
it('addEnabledExperiment should work', () => {
return perf.coreServicesAvailable().then(() => {
perf.addEnabledExperiment('experiment-a');
perf.addEnabledExperiment('experiment-b');
perf.addEnabledExperiment('experiment-a'); // duplicated entry
viewerSendMessageStub.reset();
perf.flush();
expect(viewerSendMessageStub).to.be.calledWith(
'sendCsi',
sandbox.match(payload => {
const experiments = payload.ampexp.split(',');
expect(experiments).to.have.length(3);
expect(experiments).to.have.members([
'rtv-' + getMode(win).rtvVersion,
'experiment-a',
'experiment-b',
]);
return true;
})
);
});
});
});
describes.realWin('PeformanceObserver metrics', {amp: true}, env => {
// A fake implementation of PerformanceObserver.
class PerformanceObserverImpl {
constructor(callback) {
this.options = {};
this.callback_ = callback;
this.isObserving = false;
}
observe(options) {
this.options = options;
this.isObserving = true;
}
disconnect() {
this.isObserving = false;
}
/**
* Trigger the Observer's callback.
* @param {!Array} entries
*/
triggerCallback(entries) {
this.callback_(entries, this);
}
}
describe('should forward paint metrics for performance entries', () => {
it('created before performance service registered', () => {
// Pretend that the PaintTiming API exists.
env.win.PerformancePaintTiming = true;
const entries = [
{
duration: 1,
entryType: 'paint',
name: 'first-paint',
startTime: 10,
},
{
duration: 5,
entryType: 'paint',
name: 'first-contentful-paint',
startTime: 10,
},
];
const getEntriesByType = env.sandbox.stub();
getEntriesByType.withArgs('paint').returns(entries);
getEntriesByType.returns([]);
env.sandbox
.stub(env.win.performance, 'getEntriesByType')
.callsFake(getEntriesByType);
installPerformanceService(env.win);
const perf = Services.performanceFor(env.win);
expect(perf.events_.length).to.equal(2);
expect(perf.events_[0]).to.be.jsonEqual(
{
label: 'fp',
delta: 11,
},
{
label: 'fcp',
delta: 15,
}
);
delete env.win.PerformancePaintTiming;
});
it('created after performance service registered', () => {
// Pretend that the PaintTiming API exists.
env.win.PerformancePaintTiming = true;
// Stub and fake the PerformanceObserver constructor.
const PerformanceObserverStub = env.sandbox.stub();
let performanceObserver;
PerformanceObserverStub.callsFake(callback => {
performanceObserver = new PerformanceObserverImpl(callback);
return performanceObserver;
});
env.sandbox
.stub(env.win, 'PerformanceObserver')
.callsFake(PerformanceObserverStub);
installPerformanceService(env.win);
const perf = Services.performanceFor(env.win);
const entries = [
{
duration: 1,
entryType: 'paint',
name: 'first-paint',
startTime: 10,
},
{
duration: 5,
entryType: 'paint',
name: 'first-contentful-paint',
startTime: 10,
},
];
const list = {
getEntries() {
return entries;
},
};
// Fake a triggering of the firstInput event.
performanceObserver.triggerCallback(list);
expect(perf.events_.length).to.equal(2);
expect(perf.events_[0]).to.be.jsonEqual(
{
label: 'fp',
delta: 11,
},
{
label: 'fcp',
delta: 15,
}
);
});
});
describe('should forward first input metrics for performance entries', () => {
let PerformanceObserverConstructorStub, performanceObserver;
beforeEach(() => {
// Stub and fake the PerformanceObserver constructor.
const PerformanceObserverStub = env.sandbox.stub();
PerformanceObserverStub.callsFake(callback => {
performanceObserver = new PerformanceObserverImpl(callback);
return performanceObserver;
});
PerformanceObserverConstructorStub = env.sandbox.stub(
env.win,
'PerformanceObserver'
);
PerformanceObserverConstructorStub.callsFake(PerformanceObserverStub);
});
it('created before performance service registered', () => {
// Pretend that the EventTiming API exists.
PerformanceObserverConstructorStub.supportedEntryTypes = ['firstInput'];
const entries = [
{
cancelable: true,
duration: 8,
entryType: 'firstInput',
name: 'mousedown',
processingEnd: 105,
processingStart: 103,
startTime: 100,
},
];
const getEntriesByType = env.sandbox.stub();
getEntriesByType.withArgs('firstInput').returns(entries);
getEntriesByType.returns([]);
env.sandbox
.stub(env.win.performance, 'getEntriesByType')
.callsFake(getEntriesByType);
installPerformanceService(env.win);
const perf = Services.performanceFor(env.win);
expect(perf.events_.length).to.equal(1);
expect(perf.events_[0]).to.be.jsonEqual({
label: 'fid',
delta: 3,
});
});
it('created after performance service registered', () => {
// Pretend that the EventTiming API exists.
PerformanceObserverConstructorStub.supportedEntryTypes = ['firstInput'];
installPerformanceService(env.win);
const perf = Services.performanceFor(env.win);
const entries = [
{
cancelable: true,
duration: 8,
entryType: 'firstInput',
name: 'mousedown',
processingEnd: 105,
processingStart: 103,
startTime: 100,
},
];
const list = {
getEntries() {
return entries;
},
};
// Fake a triggering of the firstInput event.
performanceObserver.triggerCallback(list);
expect(perf.events_.length).to.equal(1);
expect(perf.events_[0]).to.be.jsonEqual({
label: 'fid',
delta: 3,
});
});
it('created before performance service registered for Chrome 77', () => {
// Pretend that the EventTiming API exists.
PerformanceObserverConstructorStub.supportedEntryTypes = ['first-input'];
installPerformanceService(env.win);