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);
        }