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core(redirects): score only on wasted ms #15401

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Aug 23, 2023
Merged

core(redirects): score only on wasted ms #15401

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core(redirects): score only on wasted ms
adamraine Aug 23, 2023
dea3894
smoke
adamraine Aug 23, 2023
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5 changes: 1 addition & 4 deletions core/audits/redirects.js
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Original file line number Diff line number Diff line change
Expand Up @@ -144,10 +144,7 @@ class Redirects extends Audit {
{overallSavingsMs: totalWastedMs});

return {
// We award a passing grade if you only have 1 redirect
// TODO(phulce): reconsider if cases like the example in https://github.com/GoogleChrome/lighthouse/issues/8984
// should fail this audit.
score: documentRequests.length <= 2 ? 1 : ByteEfficiencyAudit.scoreForWastedMs(totalWastedMs),
score: ByteEfficiencyAudit.scoreForWastedMs(totalWastedMs),
numericValue: totalWastedMs,
numericUnit: 'millisecond',
displayValue: totalWastedMs ?
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6 changes: 2 additions & 4 deletions core/test/audits/redirects-test.js
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Expand Up @@ -218,14 +218,12 @@ describe('Performance: Redirects audit', () => {
});
});

it('passes when one redirect detected', () => {
it('fails when 1 redirect detected', () => {
const artifacts = mockArtifacts(SUCCESS_ONE_REDIRECT, 'https://www.lisairish.com/');
const context = {settings: {}, computedCache: new Map()};
return RedirectsAudit.audit(artifacts, context).then(output => {
// If === 1 redirect, perfect score is expected, regardless of latency
// We will still generate a table and show wasted time
expect(output.details.items).toHaveLength(2);
expect(output.score).toEqual(1);
expect(output.score).toEqual(0.48);
expect(output.numericValue).toMatchInlineSnapshot(`1000`);
expect(output.metricSavings).toEqual({LCP: 1000, FCP: 1000});
});
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