public void PopTwo()
{
ToggleSuffix list = new ToggleSuffix();
list.Toggle(40);
Assert.AreEqual(1, DataUtil.Length(list.selects));
list.Toggle(20);
Assert.AreEqual(2, DataUtil.Length(list.selects));
Assert.AreEqual(20, list.Pop());
Assert.AreEqual(1, DataUtil.Length(list.selects));
Assert.AreEqual(40, list.Pop());
Assert.AreEqual(0, DataUtil.Length(list.selects));
Assert.AreEqual(-1, list.Pop());
}
