public void testLookupExternalGraphicFactories() {
   List<ExternalGraphicFactory> result =
       loadIterator(DynamicSymbolFactoryFinder.getExternalGraphicFactories());
   assertTrue(result.size() >= 1);
   assertContainsClassInstance(result, ImageGraphicFactory.class);
 }
 public void testLookupMarkFactories() {
   List<MarkFactory> result = loadIterator(DynamicSymbolFactoryFinder.getMarkFactories());
   assertTrue(result.size() >= 2);
   assertContainsClassInstance(result, WellKnownMarkFactory.class);
   assertContainsClassInstance(result, TTFMarkFactory.class);
 }