public void testExplicitIgnoralWithMap() throws Exception {
// test simulating need to filter out metadata like class name
MyMap value = new MyMap();
value.put("a", "b");
value.put("@class", MyMap.class.getName());
Map<String, Object> result = writeAndMap(MAPPER, value);
assertEquals(1, result.size());
// verify that specified field is ignored
assertFalse(result.containsKey("@class"));
// and that others are not
assertEquals(value.get("a"), result.get("a"));
}