public void GetSurveyQuestionAsync_WhenSurveyQuestionNotFound_ReturnsErrorCode()
{
var response = _controller.GetSurveyQuestionAsync(_matchingGuid, _nonMatchingOptionGuid).Result;
_questionService.Verify(repo => repo.GetQuestionById(_nonMatchingOptionGuid), Times.Exactly(1));
Assert.IsType <NotFoundResult>(response);
}