@Test
public void testInstances() {

  LocatorIF locC = makeLocator("C");
  LocatorIF locD = makeLocator("D");
  TopicIF topicA = getTopic("A");
  TopicIF topicB = getTopic("B");
  SubjectIdentityDecider decider = new SubjectIdentityDecider(locC);
  Assert.assertTrue("Decider did not recognize instance of topic",
             decider.ok(topicA));
             
  Assert.assertTrue("Decider ok-d topic which was instance of topic with wrong identifier",
             !decider.ok(topicB));
}