public async Task AddAsync_AddsItemToDatabase() { var numberOfItemsInDatabase = await _context.Topics.AsQueryable().CountAsync(); await _service.CreateEntityAsync(new TopicDto { Id = "testTopic1", Name = "Test Topic", MaxAttemptCount = 2, QuestionsPerAttempt = 17, TimeToPass = 25, TopicNumber = 5, SubjectId = "subject2" }); _context.Topics.AsQueryable().CountAsync().Result.Should().Be(numberOfItemsInDatabase + 1); _validator.VerifyAll(); }