@Test
public void testAddGroupByVar() {

	solutionModifier.addGroupBy(Var.alloc("groupBy"));
	String[] s = byLine(query.toString());
	assertContainsRegex(GROUP_BY + var("groupBy"), s);
	solutionModifier.addGroupBy(Var.alloc("groupBy2"));
	s = byLine(query.toString());
	assertContainsRegex(GROUP_BY + var("groupBy") + SPACE + var("groupBy2"), s);
}