public void IndexOf_ItemInList_ShouldReturnIndex() { var item = 10; var anon = new AnonymousData(); var front = anon.AnyEnumerable <int>().ToArray(); var back = anon.AnyEnumerable <int>().ToArray(); var list = new List <int>(front); list.Add(item); list.AddRange(back); var index = list.IndexOf(item); Assert(index).IsEqualTo(front.Length); }