public void TestSingleLinkedList_AppendFirst()
{
var list = new SingleLinkedList <int>();
list.Add(0);
Assert.IsTrue(list.Count == 1);
Assert.IsTrue(list[0] == 0);
list.AppendFirst(17);
Assert.IsTrue(list.Count == 2);
Assert.IsTrue(list[0] == 17);
}