$this->actingAs($newUser);
$entities = $this->createEntityChainBelongingToUser($newUser, $newUser);
Activity::addForEntity($entities['book'], ActivityType::BOOK_UPDATE);
$this->actingAs($newUser);
$entities = $this->createEntityChainBelongingToUser($newUser, $newUser);
Activity::addForEntity($entities['book'], ActivityType::BOOK_UPDATE);