@Test
    void testMultipleGroupings() {
        String grouping = "[ { \"all\" : { \"group\" : \"a\", \"each\" : { \"output\" : \"count()\"}}}, { \"all\" : { \"group\" : \"b\", \"each\" : { \"output\" : \"count()\"}}} ]";
        String expected = "[[]all(group(a) each(output(count()))), []all(group(b) each(output(count())))]";

        assertGrouping(expected, parseGrouping(grouping));
    }
Tests Query.Select

@author henrhoi
@author bratseth
container-search/src/test/java/com/yahoo/select/SelectTestCase.java