public void TestGetCenterByIdShouldWorkCorrectly() { CenterInputModel centerModel = this.GetInputModel(); ICenterService centerService = new CenterService(this.dbContext); Center currentlyAdded = centerService.CreateCenter(centerModel); Center result = centerService.GetCenterById(currentlyAdded.Id); Center incorrectResult = centerService.GetCenterById(currentlyAdded.Id + "5"); Assert.NotNull(result); Assert.Null(incorrectResult); }