public void InvalidLocationArrivalTest()
        {
            var _layover = new Layover(0, "05/01/2020", "05/01/2020", 250, 1, 0);

            Assert.Throws <InvalidAttributeException>(() => LayoverValidator.Validate(_layover));
        }
        public void EmptyDepartureTest()
        {
            var _layover = new Layover(0, "05/01/2020", null, 250, 1, 2);

            Assert.Throws <InvalidAttributeException>(() => LayoverValidator.Validate(_layover));
        }