Id ff = fac.id(new HashSet<FeatureId>());
assertFalse(ff.evaluate(testFeature));
ff = fac.id(Collections.singleton(fac.featureId(testFeature.getID())));
assertTrue(ff.evaluate(testFeature));
assertFalse(ff.evaluate(null));
assertFalse(ff.evaluate(new Object()));
}
/**
* Test the logic operators.