@Test
public void testToDay() {

    Calendar now = Calendar.getInstance();
    Day today = Day.toDay();
    assertEquals(now.get(Calendar.YEAR), today.getYear());
    assertEquals(now.get(Calendar.MONTH), today.getMonth());
    assertEquals(now.get(Calendar.DAY_OF_WEEK), DayOfWeek.toCalendar(today.getDayOfWeek()));
}