public void IsValidAuthor_ValidAuthorInList_Success()
        {
            var listOfAuthors = new List <Author>()
            {
                new Author("inRepo", 0)
            };

            _mockAuthorRepo.StubGetListOfAuthors(listOfAuthors);

            Assert.True(_authorValidator.IsValidAuthor(listOfAuthors[0]));
            _mockAuthorRepo.AssertGetListOfAuthorCalled();
        }