public void AddAt1Test(int index, int[] arr, int[] vals, int[] expected)
{
DoubleLinkedList1 list = new DoubleLinkedList1(arr);
list.AddAt(index, vals);
int[] actualArr = list.ToArray();
Assert.AreEqual(expected, actualArr);
}
public void AddAtTest(int[] enter, int index, int value, int[] expected)
{
DoubleLinkedList1 list = new DoubleLinkedList1(enter);
list.AddAt(index, value);
int[] actualArr = list.ToArray();
Assert.AreEqual(expected, actualArr);
}