public void TesFindPublisherById()
        {
            int idPublisher = 1;
            var publisher   = _publisherService.FindPublisherById(idPublisher);

            Assert.Equal("PublisherTest", publisher.Name);

            idPublisher = 0;
            publisher   = _publisherService.FindPublisherById(idPublisher);
            Assert.True(publisher == null);
        }