Nightjar\Slug\Tests\SlugHandlerTest::getExtraDataObjects
By all accounts this should be setUpBeforeClass... but it is too coarse a call to achieve getting Journalist.URLSlug into the database (modifying Conifg before calling parent::setUpBeforeClass is too soon, and calling after parent;:setUpBeforeClass is too late!). So we must hijack a call from within setUpBeforeClass to allow for this. This is the only viable option!
The reason for this is because we cannot define TestOnly yaml configuration like we can with php fixture classes, and here we are also testing defining a service to apply the extension works. This is important for e.g. backwards compatiblity aliases
Signature
public function getExtraDataObjects()