public void Remove_the_Entire_List() //удалить весь список
        {
            OLS <string> list = new OLS <string>();

            list.Add_in_Tail("Смирнов");
            list.Add_in_Head("Петров");
            list.Add_in_Head("Иванов");
            list.Add_in_Head("Васичкин");
            list.Clear();

            OLS <string> .Node <string> current = list.head;
            while (current != null)
            {
                Assert.AreEqual(current.Data, null);
                current = current.Next;
            }
        }
 public void ЕслиУдаляюСписок()
 {
     list.Clear();
 }