public void UpdateAsync_WhenModelIsValid_And_MatchingSurveyNotFound_ReturnsNotFound()
{
var response = _controller.UpdateAsync(_nonMatchingGuid, new App.Models.Survey
{
Name = _surveyName
}).Result;
_surveyService.Verify(repo => repo.UpdateExistingSurvey(_nonMatchingGuid, It.IsAny <App.Models.Survey>()), Times.Exactly(1));
Assert.IsType <NotFoundResult>(response);
}