public async void RemovingQuestion(int questionId)
{
var question = await _questionnaireService.GetQuestion(questionId);
await _questionnaireService.RemoveQuestion(questionId);
Assert.Null(_dbMock.Object.Questions.FirstOrDefault(q => q.Id == questionId));
_dbMock.Verify(x => x.SaveChangesAsync(), Times.Once);
_dbMock.Object.Questions.Add(question);
}