public void EmptyIncludeTest()
        {
            IFilter filter = new LongGroundTimeFilter();
            var     test   = ShortTimeList();

            var result = filter.Include(new HashSet <Flight>(), test);

            Assert.Empty(result);
        }
        public void IncludeValidTest()
        {
            IFilter filter    = new LongGroundTimeFilter();
            var     longTime  = LongTimeList();
            var     shortTime = ShortTimeList();
            var     test      = new List <Flight>(longTime);

            test.AddRange(shortTime);


            var result = filter.Include(new HashSet <Flight>(), test);


            Assert.Equal(result, longTime);
        }