[shail-mehta]

What

Trac ticket: #65819

Adds unit tests for wp_is_writable() in tests/phpunit/tests/functions/wpIsWritable.php.

Why

wp_is_writable() has no dedicated unit tests. Adding coverage for this helper fills that gap under #65819.

How

New test class covering:

• writable temp directory → true
• missing path → false
• writable temp file → true

Test-only; no production code changes.

Testing Instructions

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

Use of AI Tools

• Cursor

[Copilot]

🟢 Approval recommended

Static review identified no blocking issues in the focused test-only changes; tests were not executed.

No open issues 🎉

What changed in this PR

Adds dedicated unit coverage for wp_is_writable() under Trac #65819, without changing production code.

Changes:

• Tests writable temporary directories and files.
• Tests that a path with a missing parent returns false, accounting for Windows behavior.

File	Description
tests/​phpunit/​tests/​functions/​wpIsWritable.php	Adds three focused tests for wp_is_writable().

_{Review effort: Balanced}

[github-actions]

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Props shailu25.

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