@Test
public void testGetSubClassesFor() {

    // Setup:
    Set<IRI> expected = Stream.of(vf.createIRI("http://mobi.com/ontology#Class1b"), vf.createIRI("http://mobi.com/ontology#Class1c")).collect(Collectors.toSet());
    IRI start = vf.createIRI("http://mobi.com/ontology#Class1a");
    Set<IRI> results = queryOntology.getSubClassesFor(start);
    assertEquals(results, expected);
}