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); }