Add guide for testing Gutenberg tickets with Playground

[khushdoms]

This PR adds a step-by-step guide for testing Gutenberg tickets using WordPress Playground.
It aims to help new contributors quickly test issues without needing a full local setup.
Feedback welcome.

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Co-authored-by: huzaifaalmesbah <huzaifaalmesbah@git.wordpress.org>
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[huzaifaalmesbah]

I think we need a more structured and purpose-driven guide specifically for testing Gutenberg using Playground.

Right now, the PR mainly outlines the basic steps for installing the Gutenberg plugin in Playground, which is helpful, but it doesn’t fully address the actual testing workflow.

Instead, the content should be aligned more closely with how core tickets are tested using Playground, similar to the approach described here:
https://make.wordpress.org/test/handbook/get-setup-for-testing/test-core-tickets-with-playground/

In particular, the guide should:

• Focus on the testing process rather than just setup
• Explain how to reproduce issues or test specific pr Gutenberg changes
• Provide clear, step-by-step instructions tailored to real testing scenarios

Updating the content in this direction would make it more useful and consistent with existing testing documentation.

[khushdoms]

Thanks for the detailed feedback!

That makes sense — I’ll update the guide to focus more on the actual testing workflow, including reproducing issues and testing PRs, aligned with the core testing approach.

I’ll push an updated version shortly.

[khushdoms]

Thanks for the helpful feedback @ozgursar !
I’ll update the guide to include a clear example of applying a Gutenberg PR using the Playground query parameter and adjust the content accordingly.

[khushdoms]

Add guide for testing Gutenberg tickets with Playground

[huzaifaalmesbah]

Looks good to me. I’ve suggested 2 changes. once those are addressed, we can merge this PR.

[huzaifaalmesbah]

Hey, I noticed this test-gutenberg-with-playground.md file is currently under the root directory. Could you please move it to the get-setup-for-testing directory?

[khushdoms]

Thanks for the review!

Moved the file to the correct get-setup-for-testing directory
Added the “Finding tickets to test” section as suggested

Please let me know if anything else is needed.

[huzaifaalmesbah]

Looks good