public void Rearange()
{
var myList = new SimpleLinkedList <int>(new[] { 1, 3, 5, 2, 4, 6 });
myList.RearrangePairs();
var netList = new List <int>();
foreach (var i in myList)
{
netList.Add(i);
}
Assert.Equal(1, netList[0]);
Assert.Equal(2, netList[1]);
Assert.Equal(3, netList[2]);
Assert.Equal(4, netList[3]);
Assert.Equal(5, netList[4]);
Assert.Equal(6, netList[5]);
}