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Tests: Add unit test coverage for single_post_title(). - #14822

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rejaulalomkhan:tests/single-post-title

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Description

Adds unit tests for single_post_title(), which had no test coverage.

The tests cover:

  • The title with and without a prefix on single posts and pages.
  • null when the queried object is not a post (category archive, home), in both modes.
  • Echo (default) and return modes.
  • The single_post_title filter: its arguments (title and post) and that its result is used.

This is a test-only change; no production code is modified.

Testing Instructions

  1. npm run test:php -- --filter Tests_General_SinglePostTitle
  2. npm run test:php -- -c tests/phpunit/multisite.xml --filter Tests_General_SinglePostTitle
  3. npm run test:php -- --group general

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

Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Claude Opus 5.5
Used for: Drafting the tests and running the checks. I reviewed the changes, ran the tests locally, and take responsibility for them.


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.

Covers the title and prefix on single posts and pages, the null result when the queried object is not a post, echo and return modes, and the single_post_title filter.

See #65819.
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