| ⇢ | A | EventManagerVariant added |
| ⇢ | B | EngineFactory::loadTestVariantEventManager() added | |
| ⇢ | A | EventManagerVariant::__construct() added | |
| ⇢ | A | EventManagerVariant::getIdentifier() added | |
| ⇢ | A | EventManagerVariant::run() added | |
| A | ↘ | B | EngineFactory::loadTestVariant() got worse |