public void GetWrongChoiceTest()
{
_indexTarget = new PrivateObject(_separation);
_index.Add(0);
_separation.SetIndex(_index);
_inputList.Add(FIRST);
_inputList.Add(LAST);
_separation.SeparateEnglishAndChinese(_inputList);
_wrongChoice = _separation.GetWrongChoice(3);
Assert.AreEqual(false, _wrongChoice.Equals(null));
_wrongChoice = _separation.GetWrongChoice(2);
Assert.AreEqual(false, _wrongChoice.Equals(null));
}