public void ParseMexicanSpanishTag()
        {
            var tag = LanguageTag.Create(Language.Spanish, Country.Mexico);

            Assert.IsNotNull(tag);
            Assert.AreNotEqual(LanguageTag.Empty, tag);
            Assert.AreEqual(Language.Spanish, tag.PrimaryLanguage);
            Assert.AreEqual(Country.Mexico, tag.Country);
            Assert.AreEqual("es-MX", tag.ToString());
        }