This category may not be up to date; it may not show all extensions that use this hook. You can view this MediaWiki Code search query to see the most up-to-date version of all extensions that use this hook.
The UnitTestsList category contains pages on extensions that use the UnitTestsList /en hook.
Since MediaWiki 1.28 (Gerrit change 302944) unit testing for extensions can be implicitly added when the subdirectory
tests/phpunit is found, so this hook is only useful for nonstandard pathes in recent versions.