public void WriteNullTest()
        {
            var converter = new XmlOptionalConverter();
            var actual    = converter.ToXml <Optional <int?> >(null);
            var expected  = "<xml />";

            Assert.That(actual, IsXml.Equals(expected));
        }
        public void WriteNullableAttributeTest()
        {
            var converter = new XmlOptionalConverter();
            var actual    = converter.ToXml <Optional <int?> >(1, member: GetAttributeMember <int?>());
            var expected  = "<xml value=\"1\" />";

            Assert.That(actual, IsXml.Equals(expected));
        }