public void EmptyCase()
        {
            var selector = new SelectorByCountryAndAge();
            var source   = GenerateStorage;
            var result   = selector.Get(source, "JPN", 20);

            Assert.Empty(result);
        }
        public void CommonCase()
        {
            var selector = new SelectorByCountryAndAge();
            var source   = GenerateStorage;
            var result   = selector.Get(source, "USA", 20);

            Assert.True(result.SequenceEqual(source.Where(e => e.Country == "USA" && e.Age == 20)));
        }