public void AddBefore(int oldItem, int item)
{
for (int i = 1; i <= 5; i++)
{
circularSinglyLinkedList.AddLast(i);
}
circularSinglyLinkedList.AddBefore(oldItem, item);
Assert.AreEqual(circularSinglyLinkedList.Count(), 6, "invalid count");
Assert.IsTrue(circularSinglyLinkedList.Contains(item), "Item doesn't exists.");
}
public void AddNullItem()
{
var list = new CircularSinglyLinkedList <string>();
list.AddFirst(null);
list.AddLast(null);
list.AddAfter(null, null);
list.AddBefore(null, null);
Assert.AreEqual(list.Count(), 4, "invalid count");
list.Remove(null);
list.RemoveFirst();
list.RemoveLast();
Assert.AreEqual(list.Count(), 1, "invalid count");
}