public void FlightAdditionCheck(string dir) { AirportModel airportModel = new AirportModel { direction = dir, departureTime = new DateTime(2008, 3, 1, 7, 0, 0), arriveTime = new DateTime(2008, 3, 1, 10, 0, 0), }; m.FlightAddition(airportModel); CollectionAssert.IsNotEmpty(m.selectByDirection(airportModel.direction)); }