@Test
public void processNominal() {

  String windy = "windy";
  String breezy = "breezy";
  ARFFModel model = new MapBackedARFFModel();
  model.addNominal(windy, breezy, 77);
  model.addNominal(windy, "strong", 23);
  model.addNominal(windy, "nuking", 55);
  Map<String, Map<String, Integer>> nominalMap = model.getNominalMap();
  assertEquals(1, nominalMap.size());
  Map<String, Integer> windyValues = nominalMap.get(windy);
  assertEquals(77, windyValues.get(breezy).intValue());
}