public void testCollectionOfIgnored() {
   POJOPropertiesCollector coll = collector(mapper, ImplicitIgnores.class, false);
   // should be 1, due to ignorals
   Map<String, POJOPropertyBuilder> props = coll.getPropertyMap();
   assertEquals(1, props.size());
   // but also have 2 ignored properties
   Collection<String> ign = coll.getIgnoredPropertyNames();
   assertEquals(2, ign.size());
   assertTrue(ign.contains("a"));
   assertTrue(ign.contains("b"));
 }