@Test
public void testRefInequality() throws ParseException {
String string = "foo != bar";
FPLParser parser = new FPLParser(string, null, null);
Predicate pred = parser.expression();
Assert.assertTrue("Parsed predicate should be a RefEquality, but is " + pred.getClass().getCanonicalName(), pred instanceof ReferenceEqualityPredicate);
ReferenceEqualityPredicate val = (ReferenceEqualityPredicate)pred;
Assert.assertTrue("Parsed predicate should be negative", !val.isPositive());