public async Task FindReviewCreatorByIdShouldReturnCorrectReviewCreatorUsername() { var review = new Review { Id = "reviewId", Creator = new ApplicationUser { Id = "testId", UserName = "******" }, ProductId = "1234" }; await this._reviewsRepository.AddAsync(review); await this._reviewsRepository.SaveChangesAsync(); var creatorUsername = _reviewsService.FindReviewCreatorById("reviewId"); Assert.Equal("TestUsername", creatorUsername); }