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Switch to new puppeteer APIs for emulating conditions #33410

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merged 3 commits into from Jul 14, 2021

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@talldan
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@talldan talldan commented Jul 14, 2021

Description

Some of the puppeteer functionality we use in tests has been replaced with friendlier APIs, that don't require calling page.target().createCDPSession();.

This PR updates them.

How has this been tested?

  1. Set one of the end to end tests to it.only to make only that test run
  2. Run OFFLINE=true npm run test-e2e:watch -- --puppeteer-interactive
  3. The test should fail, and you should be able to see that the test site has failed to load
  4. Run SLOW_NETWORK=true npm run test-e2e:watch -- --puppeteer-interactive
  5. When the browser opens, pages should load much more slowly
  6. Run THROTTLE_CPU=200 npm run test-e2e:watch -- --puppeteer-interactive
  7. When the browser opens, everything is very sluggish.

Types of changes

Small refactor

@@ -187,28 +187,34 @@ async function simulateAdverseConditions() {
return;
}

const client = await page.target().createCDPSession();
if ( OFFLINE ) {
await page.setOfflineMode( true );

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@talldan

talldan Jul 14, 2021
Author Contributor

The docs aren't very clear, but I this this is needed if we ever want to test a PWA. But I don't fully know what it does.

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Size Change: 0 B

Total Size: 1.07 MB

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Filename Size
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compressed-size-action

await page.emulateNetworkConditions( {
// Download speed (bytes/s)
downloadThroughput: ( ( 1.6 * 1024 * 1024 ) / 8 ) * 0.9,
download: ( ( 1.6 * 1024 * 1024 ) / 8 ) * 0.9,
// Upload speed (bytes/s)
uploadThroughput: ( ( 750 * 1024 ) / 8 ) * 0.9,
upload: ( ( 750 * 1024 ) / 8 ) * 0.9,
// Latency (ms)
latency: 150 * 3.75,
} );
}
Comment on lines +204 to 212

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@kevin940726

kevin940726 Jul 14, 2021
Member

I think we can just use the predefined conditions here?

await page.emulateNetworkConditions( puppeteer.networkConditions['Fast 3G'] );

Then, we can remove the comments above too.

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@talldan

talldan Jul 14, 2021
Author Contributor

This might seem silly, but the puppeteer object can't be imported.

Neither of these seem to work:

import puppeteer from 'puppeteer';
import puppeteer from 'puppeteer-core';

Not sure if you have a quick fix, but I don't want to mess around too much with dependencies, much more important stuff to do, so I think let's just ship this as is for now. Or feel free to push a commit if you can solve it.

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@kevin940726

kevin940726 Jul 14, 2021
Member

Hmm, seems like a npm/eslint issue. Peer dependency should be installed by default. Upgrading to npm 7 might fix that. But sure, this is good enough 👍.

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@kevin940726 kevin940726 left a comment

Thank you!

@kevin940726 kevin940726 merged commit f90460a into trunk Jul 14, 2021
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