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);
        }