@Test
 public void testGetInstanceById() {
   try {
     InstanceElement ie = applicationElement.getInstanceById(ODSHelper.asODSLongLong(58));
     assertEquals("1/3 Octave - Zusammenfassung", ie.getName());
     assertEquals(58, ODSHelper.asJLong(ie.getId()));
   } catch (AoException e) {
     fail(e.reason);
   }
   // query non existing instance
   try {
     applicationElement.getInstanceById(ODSHelper.asODSLongLong(999));
     fail("AoException expected");
   } catch (AoException e) {
   }
 }