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Performance suite: track TimeToFirstByte in front-end (#47037)
Co-authored-by: Sarah Norris <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| /** | ||
| * Internal dependencies | ||
| */ | ||
| import { createURL } from './create-url'; | ||
| import { isCurrentURL } from './is-current-url'; | ||
|
|
||
| /** | ||
| * Performs log out. | ||
| * | ||
| */ | ||
| export async function logout() { | ||
| // If it is logged and in a page different than the dashboard, | ||
| // move to the dashboard. Some pages may be in full-screen mode, | ||
| // so they won't have the log-out button available. | ||
| if ( ! isCurrentURL( 'wp-login.php' ) && ! isCurrentURL( 'wp-admin' ) ) { | ||
| await page.goto( createURL( 'wp-admin' ) ); | ||
| } | ||
|
|
||
| await Promise.all( [ | ||
| page.hover( '#wp-admin-bar-my-account' ), | ||
| page.waitForSelector( '#wp-admin-bar-logout', { visible: true } ), | ||
| ] ); | ||
|
|
||
| await page.click( '#wp-admin-bar-logout' ); | ||
| } |
47 changes: 47 additions & 0 deletions
47
packages/e2e-tests/specs/performance/front-end-block-theme.test.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| /** | ||
| * External dependencies | ||
| */ | ||
| import { basename, join } from 'path'; | ||
| import { writeFileSync } from 'fs'; | ||
|
|
||
| /** | ||
| * WordPress dependencies | ||
| */ | ||
| import { activateTheme, createURL, logout } from '@wordpress/e2e-test-utils'; | ||
|
|
||
| describe( 'Front End Performance', () => { | ||
| const results = { | ||
| timeToFirstByte: [], | ||
| }; | ||
|
|
||
| beforeAll( async () => { | ||
| await activateTheme( 'twentytwentythree' ); | ||
| await logout(); | ||
| } ); | ||
|
|
||
| afterAll( async () => { | ||
| await activateTheme( 'twentytwentyone' ); | ||
| const resultsFilename = basename( __filename, '.js' ) + '.results.json'; | ||
| writeFileSync( | ||
| join( __dirname, resultsFilename ), | ||
| JSON.stringify( results, null, 2 ) | ||
| ); | ||
| } ); | ||
|
|
||
| it( 'Time To First Byte (TTFB)', async () => { | ||
| // We derive the 75th percentile of the TTFB based on these results. | ||
| // By running it 16 times, the percentile value would be (75/100)*16=12, | ||
| // meaning that we discard the worst 4 values. | ||
| let i = 16; | ||
| while ( i-- ) { | ||
| await page.goto( createURL( '/' ) ); | ||
| const navigationTimingJson = await page.evaluate( () => | ||
| JSON.stringify( performance.getEntriesByType( 'navigation' ) ) | ||
| ); | ||
| const [ navigationTiming ] = JSON.parse( navigationTimingJson ); | ||
| results.timeToFirstByte.push( | ||
| navigationTiming.responseStart - navigationTiming.startTime | ||
| ); | ||
| } | ||
| } ); | ||
| } ); |
45 changes: 45 additions & 0 deletions
45
packages/e2e-tests/specs/performance/front-end-classic-theme.test.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /** | ||
| * External dependencies | ||
| */ | ||
| import { basename, join } from 'path'; | ||
| import { writeFileSync } from 'fs'; | ||
|
|
||
| /** | ||
| * WordPress dependencies | ||
| */ | ||
| import { createURL, logout } from '@wordpress/e2e-test-utils'; | ||
|
|
||
| describe( 'Front End Performance', () => { | ||
| const results = { | ||
| timeToFirstByte: [], | ||
| }; | ||
|
|
||
| beforeAll( async () => { | ||
| await logout(); | ||
| } ); | ||
|
|
||
| afterAll( async () => { | ||
| const resultsFilename = basename( __filename, '.js' ) + '.results.json'; | ||
| writeFileSync( | ||
| join( __dirname, resultsFilename ), | ||
| JSON.stringify( results, null, 2 ) | ||
| ); | ||
| } ); | ||
|
|
||
| it( 'Time To First Byte (TTFB)', async () => { | ||
| // We derive the 75th percentile of the TTFB based on these results. | ||
| // By running it 16 times, the percentile value would be (75/100)*16=12, | ||
| // meaning that we discard the worst 4 values. | ||
| let i = 16; | ||
| while ( i-- ) { | ||
| await page.goto( createURL( '/' ) ); | ||
| const navigationTimingJson = await page.evaluate( () => | ||
| JSON.stringify( performance.getEntriesByType( 'navigation' ) ) | ||
| ); | ||
| const [ navigationTiming ] = JSON.parse( navigationTimingJson ); | ||
| results.timeToFirstByte.push( | ||
| navigationTiming.responseStart - navigationTiming.startTime | ||
| ); | ||
| } | ||
| } ); | ||
| } ); |