[rejaulalomkhan]

Adds unit test coverage for the_shortlink() in src/wp-includes/link-template.php.

Test scenarios covered:

• Displaying default shortlink anchor markup with This is the short link. text.
• Respecting custom link text (Short URL, Unicode strings, HTML entities, HTML markup) via @dataProvider.
• Outputting before and after HTML markup surrounding the anchor tag.
• Outputting only before or only after markup.
• Verifying the the_shortlink filter hook arguments (receives $link, $shortlink, $text, $title).
• Passing the unused $title argument to the filter for backward compatibility.
• Customizing displayed output via the the_shortlink filter hook.
• Respecting custom shortlinks provided by the pre_get_shortlink filter hook.
• Outputting nothing (including no before/after markup) when shortlink is empty.
• Generating valid shortlinks when pretty permalinks are enabled (/?p={id}).

Verification:

• Single-site PHPUnit: OK (13 tests, 18 assertions)
• Multisite PHPUnit: OK (13 tests, 18 assertions)
• Randomized order PHPUnit: OK (13 tests, 18 assertions)
• PHPCS (WordPress-Core): Clean (0 errors, 0 warnings)
• Mutation testing: Verified 12 test failures when the echo statement is omitted.

Trac ticket: https://core.trac.wordpress.org/ticket/65819

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Use of AI Tools: Antigravity (Gemini 2.5) was used to assist in test case ideation, code scaffolding, and formatting to WordPress core standards. All assertions and test outcomes were verified locally through PHPUnit and PHPCS.

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[Copilot]

🟢 Approval recommended

The tests match existing behavior, and the test framework handles cleanup of modified state.

No open issues 🎉

What changed in this PR

Adds PHPUnit coverage for the_shortlink() without changing production code.

Changes:

• Tests default and custom link text, plus surrounding markup.
• Checks filter arguments, output customization, and empty shortlinks.
• Exercises output with pretty permalinks enabled.

File	Description
tests/​phpunit/​tests/​link/​theShortlink.php	Adds shortlink output and filter tests with shared fixtures.

_{Review effort: Balanced}

[lancewillett]

The output checks cover anchor text, wrappers, filter arguments and replacement output, and empty-shortlink suppression. Optional follow-up: use a custom shortlink containing ?a=1&b=2 and assert a literal ?a=1&b=2 href to protect escaping at the output boundary.

Unit-tests audit and Copilot review found no blockers. PHPCS passed all ten files. The combined batch passed locally in randomized order: single-site 149 tests / 283 assertions (seed 65825), multisite 140 tests / 236 assertions (seed 65826). CI is green on the reviewed commit.

_{AI review · gpt-6}

[lancewillett]

PR #14455 landed in https://core.trac.wordpress.org/changeset/64547