public void ShouldTestIEnumerable()
 {
     VectorClass<int> list = new VectorClass<int>();
     list.Add(1);
     list.Add(2);
     list.Add(3);
     list.Insert(2, 7);
     list.Remove(2);
     IEnumerator<int> enumerator =  list.GetEnumerator();
     bool b = enumerator.MoveNext();
     int result = enumerator.Current;
     Assert.AreEqual(1, result);
 }