public function it_notifies_observers_when_characters_are_added(\SplObserver $observer, Character $character)
 {
     $observer->update($this)->shouldBeCalled();
     $this->attach($observer);
     $this->givenCharacterHasCodepointWithValue($character, 1);
     $this->addMany(Character\Collection::fromArray([$character->getWrappedObject()]));
 }