### Question:
SubjectFeatures { public static Classifier getClassifier(ClassifierDefinitionId id) { return classifiers.get(id); }  static Classifier getClassifier(ClassifierDefinitionId id); static Map<ActionDefinitionId, Action> getActions(); static Action getAction(ActionDefinitionId id); static final SubjectFeatureDefinitions IOVISOR_FEATURES; }### Answer:
@Test public void testGetClassifier() { assertEquals(Classifier.ETHER_TYPE_CL, SubjectFeatures.getClassifier(EtherTypeClassifierDefinition.ID)); assertEquals(Classifier.IP_PROTO_CL, SubjectFeatures.getClassifier(IpProtoClassifierDefinition.ID)); assertEquals(Classifier.L4_CL, SubjectFeatures.getClassifier(L4ClassifierDefinition.ID)); }