@Test
public void testSubPropertiesFor() {

    // Setup:
    Set<IRI> expected = Collections.singleton(vf.createIRI("http://mobi.com/ontology#annotationProperty1b"));
    IRI start = vf.createIRI("http://mobi.com/ontology#annotationProperty1a");
    Set<IRI> results = queryOntology.getSubPropertiesFor(start);
    assertEquals(expected, results);
}