@Test
public void functionExpressionToCQL() throws Exception {

	
    Expression[] absArgs = new Expression[1];
    FilterFactory ff = CommonFactoryFinder.getFilterFactory((Hints) null);
    absArgs[0] = ff.literal(10);
    Function abs = ff.function("abs", absArgs);
	String resultECQL = ECQL.toCQL(abs);
	Assert.assertEquals("abs(10)", resultECQL);
}