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tests: fix a few tests failing with INTERNAL_LANTERN_USE_TRACE #16870

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tests: fix a few tests failing with INTERNAL_LANTERN_USE_TRACE #16870

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84eaae5
test: correctly pass networkRecords() into createTestTrace()
iamakulov Jan 29, 2026
1e31ea0
test: allow floating point differences in tbt calculations
iamakulov Jan 29, 2026
2ece359
test(oopif-requests): remove a flaky request
iamakulov Jan 29, 2026
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2 changes: 0 additions & 2 deletions cli/test/smokehouse/test-definitions/oopif-requests.js
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Expand Up @@ -64,8 +64,6 @@ const expectations = {

// Disqus iframe (OOPIF)
{url: /^https:\/\/disqus\.com\/embed\/comments\//, finished: true, statusCode: 200, resourceType: 'Document'},
// Disqus subframe (that's a new OOPIF)
{url: 'https://accounts.google.com/o/oauth2/iframe', finished: true, statusCode: 200, resourceType: 'Document'},
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@iamakulov iamakulov Jan 29, 2026

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This test was really flaky. Re-running this test over and over kept either

  • succeeding
  • or failing because this URL was missing
  • or, weirdly, failing because of a Lighthouse’s timeout? (Even DevTools Lighthouse times out if you run it against http://localhost:10200/oopif-requests.html)

I can’t see this URL in actual DevTools no matter how many times I reload http://localhost:10200/oopif-requests.html or https://www.paulirish.com/2012/why-moving-elements-with-translate-is-better-than-posabs-topleft/ (which it wraps). So I assumed the URL was there in earlier version of Disqus, or maybe is loaded very intermittently, and decided to drop it.

],
},
},
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24 changes: 14 additions & 10 deletions core/test/computed/tbt-impact-tasks-test.js
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Expand Up @@ -11,6 +11,7 @@ import {getURLArtifactFromDevtoolsLog, readJson} from '../test-utils.js';
import {createTestTrace, rootFrame} from '../create-test-trace.js';
import {networkRecordsToDevtoolsLog} from '../network-records-to-devtools-log.js';
import {MainThreadTasks} from '../../computed/main-thread-tasks.js';
import {NetworkRequest} from '../../lib/network-request.js';

const trace = readJson('../fixtures/artifacts/cnn/trace.json.gz', import.meta);
const devtoolsLog = readJson('../fixtures/artifacts/cnn/devtoolslog.json.gz', import.meta);
Expand All @@ -32,25 +33,28 @@ describe('TBTImpactTasks', () => {
let metricComputationData;

beforeEach(() => {
/** @type {Partial<LH.Artifacts.NetworkRequest>} */
const mainDocumentRequest = {
requestId: '1',
priority: 'High',
networkRequestTime: 0,
networkEndTime: 500,
transferSize: 400,
url: mainDocumentUrl,
frameId: rootFrame,
};
metricComputationData = {
trace: createTestTrace({
largestContentfulPaint: 15,
traceEnd: 10_000,
frameUrl: mainDocumentUrl,
networkRecords: [Object.assign(new NetworkRequest(), mainDocumentRequest)],
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@iamakulov iamakulov Jan 29, 2026

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With INTERNAL_LANTERN_USE_TRACE, the test needed networkRecords to be present. (Coincidentally, with INTERNAL_LANTERN_USE_TRACE, the test also doesn’t need devtoolsLog, but I’m not removing it because the CDP branch still needs it.)

topLevelTasks: [
// Add long task to defer TTI
{ts: 1000, duration: 1000},
],
}),
devtoolsLog: networkRecordsToDevtoolsLog([{
requestId: '1',
priority: 'High',
networkRequestTime: 0,
networkEndTime: 500,
transferSize: 400,
url: mainDocumentUrl,
frameId: rootFrame,
}]),
devtoolsLog: networkRecordsToDevtoolsLog([mainDocumentRequest]),
URL: {
requestedUrl: mainDocumentUrl,
mainDocumentUrl,
Expand Down Expand Up @@ -266,7 +270,7 @@ describe('TBTImpactTasks', () => {
expect(tasksWithNoChildren).toEqual(tasksWithAllSelfImpact);

const totalSelfImpact = tasksImpactingTbt.reduce((sum, t) => sum += t.selfTbtImpact, 0);
expect(totalSelfImpact).toMatchInlineSnapshot(`2819.9999999999545`);
expect(totalSelfImpact).toBeCloseTo(2820, 6);
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@iamakulov iamakulov Jan 29, 2026

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Minor floating arithmetic differences with and without INTERNAL_LANTERN_USE_TRACE :)

Snapshot name: `TBTImpactTasks works on real artifacts with lantern 2`

Snapshot: 2819.9999999999545
Received: 2819.999999999922
    at Context.<anonymous> (file:///Users/iamakulov/Repos/lighthouse/core/test/computed/tbt-impact-tasks-test.js:269:31)


// Total self blocking time is just the total self impact without factoring in the TBT
// bounds, so it should always be greater than or equal to the total TBT self impact.
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