@Test
public void testConversion() {
Calendar calendar = Calendar.getInstance();
calendar.set(2009, 6, 3, 12, 20, 10);
DateContainer result = mapper.map(calendar.getTime(), DateContainer.class);
assertNotNull(result);
assertEquals("2009-07-03 12:20:10", result.getDate());
assertEquals("2009-07-03 12:20:10", result.getSet().iterator().next());
}