[rejaulalomkhan]

Description

In Tests_General_SingleTermTitle (tests/phpunit/tests/general/singleTermTitle.php), wpSetUpBeforeClass() registers a custom taxonomy (wptests_genre) and set_up() registers both wptests_genre and a custom post type (wptests_book) without unregistering them in wpTearDownAfterClass() or tear_down().

This leaks the custom taxonomy and post type into global registries, causing potential test pollution for subsequent test classes in the test suite.

This PR adds wpTearDownAfterClass() and tear_down() to Tests_General_SingleTermTitle to properly unregister wptests_genre and wptests_book.

Testing Instructions

1. Run vendor/bin/phpunit tests/phpunit/tests/general/singleTermTitle.php -> PASS (12 tests, 30 assertions).
2. Run vendor/bin/phpunit -c tests/phpunit/multisite.xml tests/phpunit/tests/general/singleTermTitle.php -> PASS (12 tests, 30 assertions).
3. Run vendor/bin/phpcs tests/phpunit/tests/general/singleTermTitle.php -> PASS (0 errors, 0 warnings).

Trac ticket: https://core.trac.wordpress.org/ticket/65893

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

Use of AI Tools

• Tool: Antigravity
• Model: Gemini 3.8 Flash
• Used for: Identified the missing custom taxonomy and post type unregistration in singleTermTitle.php lifecycle methods, added wpTearDownAfterClass() and tear_down(), verified tests locally, and prepared the patch. I reviewed every line, ran the tests listed above, and take responsibility for the change.

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Props rejaulalomkhan.

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