public async Task ExistsShouldReturnTrue() { await _reviewsService.CreateAsync("Very good pizza", "1234", "2345"); await _reviewsService.CreateAsync("Brilliant", "12345", "2345"); var firstReviewId = _reviewsRepository.All().First().Id; var secondReviewId = _reviewsRepository.All().Last().Id; Assert.True(_reviewsService.Exists(firstReviewId)); Assert.True(_reviewsService.Exists(secondReviewId)); }