public void CopyTo()
        {
            var list = new SortedListReactiveCollectionSource <int>();

            var range = new[] { 1, 2, 3 };

            list.AddRange(range);

            var target = new int[5];

            list.CopyTo(target, 2);

            target.Should().Equal(0, 0, 1, 2, 3);
        }
        public void CopyTo()
        {
            var list = new SortedListReactiveCollectionSource<int>();

            var range = new[] { 1, 2, 3 };
            list.AddRange(range);

            var target = new int[5];
            list.CopyTo(target, 2);

            target.Should().Equal(0, 0, 1, 2, 3);
        }