public void Add_After_Count_0_Does_Not_Add()
{
var linkedList = new DoubleLinkedList <int>();
var newNode = new DoubleLinkedListNode <int>(1);
var nodeNotInList = new DoubleLinkedListNode <int>(2);
linkedList.AddAfter(nodeNotInList, newNode);
linkedList.Count.Should().Be(0);
}
public void Can_Add_After_Element()
{
var linkedList = new DoubleLinkedList <int>();
var node1 = new DoubleLinkedListNode <int>(1);
var node2 = new DoubleLinkedListNode <int>(2);
var newNode = new DoubleLinkedListNode <int>(3);
linkedList.AddFirst(node1);
linkedList.AddLast(node2);
linkedList.AddAfter(node1, newNode);
linkedList.Count.Should().Be(3);
linkedList.First.Should().Be(node1);
linkedList.Last.Should().Be(node2);
linkedList.First.Value.Should().Be(1);
linkedList.First.Next.Value.Should().Be(3);
linkedList.Last.Value.Should().Be(2);
linkedList.Last.Previous.Value.Should().Be(3);
}