@Test
    public void testCondition() throws ParseException {
        RankingExpression expression = new RankingExpression("if(1<2,3,4)");
        assertTrue(expression.getRoot() instanceof IfNode);
    }
@author Simon Thoresen Hult
@author bratseth
searchlib/src/test/java/com/yahoo/searchlib/rankingexpression/RankingExpressionTestCase.java