public void When_GetPreviousQuestion_Is_Called_QuestionId_Is_Changed_To_PreviousQuestion()
 {
     _viewModelRef.FirstQuestion();
     _viewModelRef.SelectedOption = "1";
     _viewModelRef.GetNextQuestion();
     _viewModelRef.GetPrevQuestion();
     Assert.AreEqual(1, _viewModelRef.QuestionId);
 }