public void TestInsertBeforeFirst()
{
VisitableLinkedList <int> list = GetTestCustomLinkedList();
LinkedListNode <int> currentElement = list.First;
list.AddBefore(currentElement, 657);
Assert.AreEqual(list.First.Value, 657);
currentElement = list.First;
// Verify the list items and their contents
for (int i = 0; i < 6; i++)
{
if (i == 0)
{
Assert.AreEqual(currentElement.Value, 657);
}
else
{
Assert.AreEqual(currentElement.Value, (i - 1) * 3);
}
currentElement = currentElement.Next;
}
}
public void TestInsertBefore1Item()
{
VisitableLinkedList <int> list = new VisitableLinkedList <int>();
list.AddLast(5);
list.AddBefore(list.First, 6);
Assert.AreEqual(list.First.Value, 6);
Assert.AreEqual(list.First.Next.Value, 5);
Assert.AreEqual(list.Last.Value, 5);
}