store.createSchema(ft);
store.addFeatures(testFeatures);
SimpleFeatureCollection thisFC = store.getFeatureSource("nullnan").getFeatures();
// create the expression
Divide divide = ff.divide(ff.property("foo"), ff.property("bar"));
JenksNaturalBreaksFunction qf = (JenksNaturalBreaksFunction) ff.function("Jenks", divide, ff.literal(3));
RangedClassifier range = (RangedClassifier) qf.evaluate(thisFC);
assertEquals(3 , range.getSize()); // 2 or 3?
assertEquals("0..0", range.getTitle(0));