WeatherRepository { public Airport findAirport(String iataCode) { return airports.get(iataCode); }  Airport findAirport(String iataCode); Airport getAirport(String iataCode); void saveAirport(Airport airport); Collection<Airport> getAllAirports(); void deleteAll(); void removeAirport(String iataCode);  }
@Test public void findInexistentReturnsNull() { assertNull(target.findAirport("code2")); }