$entity_types['entity_test_label']->setStorageClass('Drupal\Core\Entity\KeyValueStore\KeyValueContentEntityStorage');
$entity_keys = $entity_types['entity_test_label']->getKeys();
$entity_types['entity_test_label']->set('entity_keys', $entity_keys + ['uuid' => 'uuid']);
+ $entity_types['entity_test_label']->set('provider', 'keyvalue_test');
}
}