Tests: Add unit tests for image rendering

[SantosGuillamot]

What?

In this pull request I'm adding a first suite of unit tests to ensure the image is rendered (or not rendered) appropriately. This can be use as a reference to add lightbox tests or other changes made in the PHP rendering in the future.

Why?

It will help cover different use cases, especially related to block bindings, and ensure changes won't break the user experience. For example this one.

How?

I added a new file in the blocks unit tests and followed the patterns there.

Testing Instructions

The new unit tests should pass.

I also checked that removing this conditional in the image rendering the tests fail.

[github-actions]

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Co-authored-by: SantosGuillamot <santosguillamot@git.wordpress.org>
Co-authored-by: cbravobernal <cbravobernal@git.wordpress.org>

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[github-actions]

Flaky tests detected in e4af6b6.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/11272056775
📝 Reported issues:

• [Flaky Test] Navigates the items list via UP/DOWN arrow keys #64334 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js

[cbravobernal]

LGTM, I guess these ones should be backported to Core.

[SantosGuillamot]

I can see there are PHP unit tests for blocks in Core and in Gutenberg, but they don't seem to be replicated:

• Core.
• Gutenberg.
  From what I saw, the Gutenberg ones receive more updates and, as the code related to blocks lives in Gutenberg, I assume that was the proper place.

Is this something that should be replicated as well in core?

[cbravobernal]

Is this something that should be replicated as well in core?

That case let's keep them here. As is code related to blocks.