The old tests/phpunit/phpunit.php entrypoint and its associates tests/phpunit/suite.xml configuration file have been deprecated as part of T90875. Developers should now use `composer phpunit` (or `vendor/bin/phpunit` directly), and `phpunit.xml.dist` if they need to do something explicitly with the config file. This task tracks the removal of both, as well associated functionality, from MW core.
To do:
[] Direct usages in CI ([[ https://codesearch.wmcloud.org/devtools/?q=phpunit%5C.php%7Csuite%5C.xml&files=&excludeFiles=changelog%7CCHANGELOG&repos= | codesearch ]]). Note that some of these might still be used on REL1_39, where `vendor/bin/phpunit` is not yet a viable replacement.
[] Usages in WMF extensions/skins ([[https://codesearch.wmcloud.org/deployed/?q=phpunit%5C.php%7Csuite%5C.xml | codesearch ]])
[] MW core cleanup ([[https://codesearch.wmcloud.org/core/?q=phpunit%5C.php%7Csuite%5C.xml | codesearch ]]). Also anything referenced by these, like dropping bootstrap.maintenance.php, and merging bootstrap.common.php and bootstrap.integration.php.