Fix PHPUnit bootstrap setup

[erseco]

Summary

• point the Composer test script at the existing phpunit Composer script so the bundled executable is used
• bootstrap PHPUnit via Yoast WP Test Utils helpers to locate the WordPress test suite and surface a clear error when it is missing

Testing

• composer test (fails: The WordPress native unit test bootstrap file could not be found)

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https://chatgpt.com/codex/tasks/task_e_68edfc590eac832291c255438b26d755

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Require WordPress test helper using path without separator

After switching to WPIntegration\get_path_to_wp_test_dir() the include now concatenates the tests directory and includes/functions.php without adding a /. get_path_to_wp_test_dir() returns whatever was provided via WP_TESTS_DIR/WP_DEVELOP_DIR; when those variables omit a trailing slash (common in the official setup instructions) the resulting path becomes …wordpress-tests-libincludes/functions.php and the bootstrap immediately fails with No such file or directory. Append an explicit slash (e.g. $_tests_dir . '/includes/functions.php') or normalize the path before including so tests can run regardless of how the environment variable is formatted.

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