[shail-mehta]

Trac ticket: #65819

What

Adds a dedicated PHPUnit class for rest_output_link_wp_head(), covering the REST API <link> tag output and the empty REST URL early return.

Test-only; no production code changes.

Why

rest_output_link_wp_head() had no direct @covers coverage. Small helper coverage fits the #65819 test cleanup track.

How

Add tests/phpunit/tests/rest-api/restOutputLinkWpHead.php with @covers ::rest_output_link_wp_head.

• Outputs the https://api.w.org/ link for the REST root
• Outputs nothing when rest_url is filtered to an empty string

Testing Instructions

1. npm run test:php -- --filter Tests_REST_API_RestOutputLinkWpHead
2. npm run test:php -- --filter Tests_REST_API_RestOutputLinkWpHead -c tests/phpunit/multisite.xml
3. npm run test:php -- --filter Tests_REST_API_RestOutputLinkWpHead --order-by=random
4. npm run test:php -- --group restapi

Use of AI Tools

• Cursor

[Copilot]

🟢 Approval recommended

No active review issues are reported for the test-only change adding coverage of REST API discovery link output and the empty-URL case.

No open issues 🎉

What changed in this PR

Adds direct PHPUnit coverage for rest_output_link_wp_head() as part of the #65819 test cleanup effort. No production code changes.

Changes:

• Adds a dedicated test class with @covers ::rest_output_link_wp_head.
• Checks the REST API discovery link output.
• Checks that filtering the REST URL to an empty string produces no output.

File	Description
tests/​phpunit/​tests/​rest-api/​restOutputLinkWpHead.php	Adds tests for REST discovery link output and the empty-URL early return.

_{Review effort: Balanced}

[github-actions]

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[lancewillett]

Asserts the externally emitted REST discovery link and suppression when REST URL is disabled; no existing direct test found.

Local randomized single-site and multisite checks passed alongside related existing tests; PHPCS passed.

Optional: Expected URL derives from environment; acceptable for site-dependent base URL, but this does not independently test URL escaping. No additional edge matrix requested.

_{AI review · gpt-6}

[lancewillett]

PR #15282 landed in https://core.trac.wordpress.org/changeset/65140