public void AiredEpisodeOrderCompareTest(BaseItem x, BaseItem y, int expected)
        {
            var cmp = new AiredEpisodeOrderComparer();

            Assert.Equal(expected, cmp.Compare(x, y));
            Assert.Equal(-expected, cmp.Compare(y, x));
        }
        public void Compare_GivenNull_ThrowsArgumentNullException(BaseItem x, BaseItem y)
        {
            var cmp = new AiredEpisodeOrderComparer();

            Assert.Throws <ArgumentNullException>(() => cmp.Compare(x, y));
        }