@Test
public void testMappedCollectionWrapperBinding_2() throws Exception {

	Map<String,Set<String>> map = new HashMap<>( 0 );
	MappedCollectionWrapper obj = new MappedCollectionWrapper( map );
	StringWriter writer = new StringWriter();
	ObjectMapper mapper = JSonBindingUtils.createObjectMapper();
	mapper.writeValue( writer, obj );
	String s = writer.toString();
	Assert.assertEquals( "{}", s );
	MapWrapper read = mapper.readValue( s, MapWrapper.class );
	Assert.assertEquals( obj.getMap(), read.getMap());
}