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Repair wp/5.6 branch Actions: Pin wp-phpunit/wp-phpunit to the WordPress 5.6 test bootstrap - #84974

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@desrosj

@desrosj desrosj commented Oct 16, 2026 •

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Part of #82937.

What?

Changes the wp-phpunit/wp-phpunit constraint in composer.json from ^5.4 to ~5.6.0, and adds yoast/phpunit-polyfills ^1.0, which that test library requires. composer.lock moves wp-phpunit/wp-phpunit from 5.5.1 to 5.6.20, the newest 5.6.x release on Packagist, and adds yoast/phpunit-polyfills 1.1.5.

Why?

This branch maintains the code as it exists in WordPress 5.6, but ^5.4 resolved to wp-phpunit/wp-phpunit 5.5.1, a copy of WordPress 5.5's test library. The tests ran against the wrong release's test helpers.

wp-phpunit/wp-phpunit 5.6.6 and newer require yoast/phpunit-polyfills. Without it, every leg stops before any test runs:

Error: The PHPUnit Polyfills library is a requirement for running the WP test suite.

How?

This is the wp/5.6 version of #84942 (wp/5.8, ~5.8.0), #84944 (wp/5.7, ~5.7.0), #84413 (wp/5.9) and #84279 (wp/6.0).

yoast/phpunit-polyfills requires phpunit/phpunit, and this branch has no phpunit/phpunit dependency yet, so Composer pulls in PHPUnit 8.5.56 and its dependencies here. #84975, directly above, replaces it with PHPUnit 7.5 and sets the platform PHP version. Every 5.6.x release still refuses PHPUnit 8 and newer, so on its own this PR doesn't fix the PHP 8.0 legs.

WordPress 5.6's test library also ships includes/phpunit7/MockObject/, copies of four PHPUnit 7.5 mock classes patched to avoid ReflectionParameter::getClass(), which is deprecated in PHP 8. WordPress Core loads them through its own composer.json (autoload-dev files plus exclude-from-classmap for PHPUnit's originals). wp-phpunit/wp-phpunit doesn't register them, and this PR doesn't either: wp/5.7 and wp/5.8 run PHPUnit 7.5 on PHP 8.0 without them.

Use of AI Tools

This PR was created by Claude Code under my supervision. All code should be treated as AI-produced and not yet reviewed by a human until this PR is marked Ready for Review.

🤖 Generated with Claude Code

@desrosj desrosj added the [Type] Build Tooling Issues or PRs related to build tooling label Oct 16, 2026
@desrosj desrosj self-assigned this Oct 16, 2026
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Size Change: 0 B

Total Size: 1.2 MB

ℹ️ View Unchanged
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@desrosj
desrosj marked this pull request as ready for review October 16, 2026 18:09
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The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: desrosj <desrosj@git.wordpress.org>
Co-authored-by: andrewserong <andrewserong@git.wordpress.org>

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LGTM!

@desrosj
desrosj force-pushed the fix-actions-5.6/fix-phpunit-execution branch from 87636df to 4ed2817 Compare October 23, 2026 14:12

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