@Test
public void testOrderByClause() {

  Parser<OrderBy> parser = RelationParser.orderByClause(ExpressionParser.NUMBER);
  TerminalParserTest.assertParser(parser, "order by 1, 2 desc, 3 asc", new OrderBy(Arrays.asList(
      new OrderBy.Item(ExpressionParserTest.number(1), true), new OrderBy.Item(ExpressionParserTest.number(2), false),
      new OrderBy.Item(ExpressionParserTest.number(3), true))));
}