public void EmptyExcludeTest()
        {
            IFilter filter = new DepartBeforeArriveFilter();
            var     test   = ArriveBefore();

            var result = filter.Exclude(test);

            Assert.Empty(result);
        }
        public void ExcludeValidTest()
        {
            IFilter filter = new DepartBeforeArriveFilter();
            var     depart = DepartBefore();
            var     arrive = ArriveBefore();
            var     test   = new List <Flight>(depart);

            test.AddRange(arrive);


            var result = filter.Exclude(test);


            Assert.Equal(depart, result);
        }