public void Insert()
{
list.Insert(5, "derp");
list[5].Should().Be("derp");
list[0] = "Hello world!";
list[0].Should().Be("Hello world!");
set.Insert(8, "wot");
set[8].Should().Be("wot");
set[set.Count - 1] = "Hello world!";
set[set.Count - 1].Should().Be("Hello world!");
}