public void AddMovie()
        {
            service.AddMovie("FF223", "Fight Club", "Fincher, David", "1999");
            var material = service.Retrieve("FF223");

            Assert.That(material.Classification, Is.EqualTo("FF223"));
            Assert.That(material.Title, Is.EqualTo("Fight Club"));
            Assert.That(material.Director, Is.EqualTo("Fincher, David"));
            Assert.That(material.Year, Is.EqualTo("1999"));
        }
        public void AddMovie()
        {
            service.AddMovie("FF223", "Fight Club", "Fincher, David", "1999");
            var material = service.Retrieve("FF223");

            Assert.Equal("FF223", material.Classification);
            Assert.Equal("Fight Club", material.Title);
            Assert.Equal("Fincher, David", material.Director);
            Assert.Equal("1999", material.Year);
        }