public void BuildExpression_OrderBy()
        {
            MySQLBuilder sqlBuilder = new MySQLBuilder();

            sqlBuilder.AddSelectClause("id");
            sqlBuilder.AddFromClause("employees");
            sqlBuilder.AddOrderByClause("name", SortDirection.Descending);

            StringBuilder stringBuilder = new StringBuilder();

            sqlBuilder.BuildExpression(stringBuilder);

            Assert.AreEqual("SELECT DISTINCT id FROM employees ORDER BY name DESC;", stringBuilder.ToString());
        }