jetpack: More locking in CI coverage test

[anomiex]

Closes MONOREP-218

Proposed changes:

PR #45851 added some locking for Jetpack_Sync_Themes_Test. We also have some tests that are messing with a plugin, which can also wind up interfering with each other. Add locking for those too.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

p1762964280572399/1762963867.449579-slack-C034JEXD1RD

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• CI happy?
• Change look reasonable?
• Hard to really test it solves the intermittent failure though 🤷

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack), and enable the add/more-jetpack-test-locking branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack add/more-jetpack-test-locking

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

Thank you for your PR!

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---

Follow this PR Review Process:

1. Ensure all required checks appearing at the bottom of this PR are passing.
2. Make sure to test your changes on all platforms that it applies to. You're responsible for the quality of the code you ship.
3. You can use GitHub's Reviewers functionality to request a review.
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---

Jetpack plugin:

The Jetpack plugin has different release cadences depending on the platform:

• WordPress.com Simple releases happen as soon as you deploy your changes after merging this PR (PCYsg-Jjm-p2).
• WoA releases happen weekly.
• Releases to self-hosted sites happen monthly:
  • Scheduled release: December 2, 2025

If you have any questions about the release process, please ask in the #jetpack-releases channel on Slack.

[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

Full summary · PHP report · JS report

[tbradsha]

Is this because it might throw and end a test early?

[anomiex]

Yeah. The lock would get released anyway when the phpunit process exits, but it doesn't hurt to clean up earlier.