public void AddLast_CheckHead_CheckTail_CheckCount() { // Act linkedList.AddNodeInLast(3); linkedList.AddNodeInLast(4); linkedList.AddNodeInLast(5); // Assert Assert.Equal(tailExpected, linkedList.Tail); Assert.Equal(headExpected, linkedList.Head); Assert.Equal(middleExpected, linkedList.Head.Next); Assert.Equal(middleExpected, linkedList.Tail.Previous); Assert.Equal(3, linkedList.Count); }