public void AddFirst_SecondItem_ShouldNowBecomeTheHeadNode() { // Arrange var linkedList = new SinglyLinkList<int>(); linkedList.AddFirst(new SinglyLinkListNode<int>(10)); // Act linkedList.AddFirst(new SinglyLinkListNode<int>(20)); // Assert 20 -> 10 -> null Assert.AreEqual(2, linkedList.Count, "Should contain two items."); Assert.AreEqual(20, linkedList.GetHeadAndTail().Item1.Value, "Head should contain the the expected value."); Assert.AreEqual(10, linkedList.GetHeadAndTail().Item2.Value, "Tail should contain the expected value."); Assert.AreEqual(linkedList.GetHeadAndTail().Item1.Next, linkedList.GetHeadAndTail().Item2, "Head.Next should be pointing to the tail."); Assert.IsNull(linkedList.GetHeadAndTail().Item2.Next, "Tail should not point to null."); Assert.AreEqual(20, linkedList.ElementAt(0), "Enumeration should return the expected value."); Assert.AreEqual(10, linkedList.ElementAt(1), "Enumberation should return the expected value."); }
public void AddLast_WhenThereAreMoreElements_ShouldAddToTheLastPosition() { // Arrange var linkedList = new SinglyLinkList<decimal>(); linkedList.AddFirst(new SinglyLinkListNode<decimal>(2.0m)); linkedList.AddFirst(new SinglyLinkListNode<decimal>(3.4m)); // Act linkedList.AddLast(new SinglyLinkListNode<decimal>(5.5m)); // Assert Assert.AreEqual(5.5m, linkedList.GetHeadAndTail().Item2.Value, "Should contain expected value."); Assert.AreEqual(3.4m, linkedList.ElementAt(0), "Should be the expected value."); Assert.AreEqual(2.0m, linkedList.ElementAt(1), "Should be the expected value."); Assert.AreEqual(5.5m, linkedList.ElementAt(2), "Should be the expected value."); }