[lancewillett]

Some PHPUnit tests depend on Core JavaScript and CSS files, so they must remain covered when testing is narrowed for frontend-only changes.

Add an assets group to 17 existing test methods covering shortcode regex parity, oEmbed rendering, CSS inlining and hoisting, admin view-transition CSS, and generated script-module files. The annotations allow --group assets selection while keeping every test in its normal suite.

The selection includes the methods identified by the empty-assets experiment in Trac comment 4, plus nearby tests that read assets or require them to exist. Emptying a file does not necessarily fail tests whose expectations are derived from that file.

This PR adds test annotations only. Workflow routing is proposed separately in PR #13523, which depends on this group landing first. Bundled-theme metadata, test fixtures, and build tooling still need normal testing; this group does not establish that every .js or .css change can use reduced coverage.

Trac ticket: https://core.trac.wordpress.org/ticket/65889

Testing notes

Validation with PHP 8.3.32, MySQL 9.7.2, and PHPUnit 9.6.36:

• --group assets: 33 tests / 301 assertions passed on both single site and multisite.
• Generated script-module file check explicitly executed: 1 test / 59 assertions passed.
• PHPCS passed all six modified files.
• Assets built with npm run build:dev in Node 24 Docker.

An earlier isolated experiment emptied 1,295 source and generated .js/.css files under src/js/, src/wp-admin/css/, src/wp-admin/js/, src/wp-includes/css/, src/wp-includes/js/, and src/wp-includes/build/ after building. Bundled themes and test fixtures were kept intact.

• Full single-site run: 26,234 tests; full multisite run: 27,074 tests.
• Both runs reproduced the same 10 failures covered by this group: shortcode regex parity, eight late-style-hoisting datasets, and admin view-transition CSS.
• Both also hit Tests_Image_Functions::test_wp_crop_image_with_url. That test still failed alone after restoring assets (error_loading_image: File does not exist? for the remote image), so it was not attributed to asset truncation.
• All 1,295 assets were restored and verified against their original SHA-256 hashes. The restored assets group passed again: 23 tests / 253 assertions.

The full runs were not green: each reported 11 failures and 86 warnings, with 44 single-site skips and 46 multisite skips. The result supports the group for the tested asset paths; it is not a claim of exhaustive coverage for every frontend file.

Review follow-up

Added the ten methods identified in Adrian’s review: eight oEmbed output tests, test_get_post_embed_html(), and test_wp_enqueue_view_transitions_admin_css().

Missing-file checks complement the earlier file-truncation experiment:

• Temporarily removing wp-embed-template.css or wp-embed-template.js caused the newly selected oEmbed output test to error.
• Temporarily removing wp-embed.js caused the newly selected test_get_post_embed_html() to error.
• Removing view-transitions.css emitted a warning, but the enqueue-only test still passed. Its group annotation includes the asset read in reduced runs; the existing test_inline_css_included() supplies the content assertion.
• All four files were restored and verified against their original SHA-256 hashes.

The neighboring tests in these two files were checked for the same dependency; no additional annotations were identified there.

Use of AI tools

AI assistance: Yes.
Tool: Codex.
Model: GPT-6.
Used for: Auditing asset-dependent tests, adding group annotations, and local validation.

[github-actions]

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Props lancewillett, adrianmoldovanwp.

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[adimoldovan]

The following tests also read Core assets but have no @group assets. A missing file fails them in the full suite, but the reduced job in #13523 never runs them.

• tests/phpunit/tests/oembed/template.php: the eight test_oembed_output_* methods load theme-compat/embed.php, which reads wp-embed-template.css and wp-embed-template.js. test_get_post_embed_html reads wp-embed.js.
• tests/phpunit/tests/view-transitions/wpEnqueueViewTransitionsAdminCss.php: test_wp_enqueue_view_transitions_admin_css builds a new WP_Styles, which reads view-transitions.css.

[lancewillett]

Thanks, Adrian. Added all ten annotations in d566a19.

The expanded assets group passes 33 tests / 301 assertions in both single-site and multisite. PHPCS passes all six PR files.

Missing-file probes now complement the earlier truncation experiment: removing either embed template asset or wp-embed.js causes a newly selected test to error. One nuance: the view-transition enqueue test emits a missing-file warning but still passes; the existing inline-CSS test supplies the content assertion. All moved files were restored and hash-verified.

These paths already select the assets job in #13523. Both PR descriptions now include the updated validation; #13522 still needs to land first. CI is running on the new commit.

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_{Adversarial review · gpt-6}

[johnbillion]

Looks good. Can always add other tests that depend on assets as they're discovered.

[lancewillett]

https://core.trac.wordpress.org/changeset/63628