public void TotalShouldReturnCorrectCount() { // Arrange var firstBeer = new Beer { Id = 1, Name = "First" }; var secondBeer = new Beer { Id = 2, Name = "Second" }; var thirdBeer = new Beer { Id = 3, Name = "Third" }; this.db.AddRange(firstBeer, secondBeer, thirdBeer); this.db.SaveChanges(); var beerService = new AdminBeerService(this.db); // Act var result = beerService.Total(""); var secondResult = beerService.Total("d"); // Assert result .Should() .Equals(3); secondBeer .Should() .Equals(2); }