public void CreateAuthor_ShouldCreateValidAuthor()
        {
            // Fixture setup
            var authorRepo    = new InMemoryRepository <Author>();
            var authorService = new AuthorApplicationService(authorRepo);

            var expected = new Author()
            {
                FirstName = "blah",
                LastName  = "fdlskhgdsa",
                Synopsis  = "fhlkhdfaslkhjgoiuwer"
            };

            // Exercise the SUT (system under test)
            authorService.CreateAuthor(
                expected.FirstName,
                expected.LastName,
                expected.Synopsis);

            // State verification
            var actual = authorRepo.AsQueryable().FirstOrDefault();

            Assert.Equal(1, authorRepo.Count());
            Assert.Equal(expected.FirstName, actual.FirstName);
            Assert.Equal(expected.LastName, actual.LastName);
            Assert.Equal(expected.Synopsis, actual.Synopsis);
        }