public void NpgsqlBoxConstructorTest()
        {
            SqlExpression box = SqlDml.Native("box'(2,3),(0,1)'");

            CheckEquality(
                PostgresqlSqlDml.NpgsqlBoxConstructor(
                    PostgresqlSqlDml.NpgsqlPointConstructor(2, 3),
                    PostgresqlSqlDml.NpgsqlPointConstructor(0, 1)),
                box);

            CheckEquality(
                PostgresqlSqlDml.NpgsqlBoxConstructor(
                    SqlDml.Native("point'(2,3)'"),
                    SqlDml.Native("point'(0,1)'")),
                box);
        }