public void AddTests()
{
var list = new LinkedList<string>();
list.AddFirst("Robert");
Assert.AreEqual("Robert", list.Head.Value);
Assert.IsNull(list.Tail);
Assert.AreEqual(1, list.Size);
//add another item
list.AddFirst("Macdonald Smith");
Assert.AreEqual("Macdonald Smith", list.Head.Value);
Assert.AreEqual("Robert", list.Head.Previous.Value);
Assert.AreEqual(2, list.Size);
//add to the other end of the list
list.AddLast("Last");
Assert.AreEqual("Macdonald Smith", list.Head.Value);
Assert.AreEqual("Robert", list.Head.Previous.Value);
Assert.AreEqual("Last", list.Tail.Value);
Assert.AreEqual(3, list.Size);
}
public void SearchInsertRemoveTests()
{
var list = new LinkedList<string>(new []{"first", "second", "third", "forth"});
Assert.AreEqual(4, list.Size);
//search for the value "first"
var retrievedFirst = list.Find("first");
Assert.IsNotNull(retrievedFirst);
Assert.AreEqual("first", retrievedFirst.Value);
//search for the value "forth"
var retrievedForth = list.Find("forth");
Assert.IsNotNull(retrievedForth);
Assert.AreEqual("forth", retrievedForth.Value);
//search for the value "second"
var retrieved = list.Find("second");
Assert.IsNotNull(retrieved);
Assert.AreEqual("second", retrieved.Value);
//insert a new node with value "1.5" before the node we just found
var beforeThisNode = retrieved;
list.InsertBefore(beforeThisNode, "1.5");
var foundItAfterInsert = list.Find("1.5");
Assert.AreSame(beforeThisNode, foundItAfterInsert.Next);
Assert.AreSame(beforeThisNode.Previous, foundItAfterInsert);
Assert.AreEqual(5, list.Size);
//remove the node with the value "third"
list.Remove("third");
Assert.AreEqual(4, list.Size);
Assert.IsNull(list.Find("third"));
//remove the node with the value "first"
list.Remove("first");
Assert.AreEqual(3, list.Size);
Assert.IsNull(list.Find("first"));
}