def METHOD_NAME(self):
    person = self.person.serialize()
    department = self.department.serialize()
    persons_service.add_to_department(department["id"], person["id"])
    persons_service.remove_from_department(department["id"], person["id"])
    person = persons_service.get_person(person["id"])
    self.assertEqual(len(person["departments"]), 0)