@Test
public void testPlusWeeks()
{

    DateTimeUnit dateTimeUnit = new DateTimeUnit( 1382, 1, 20 );
    DateTimeUnit testDateTimeUnit = calendar.plusWeeks( dateTimeUnit, 4 );
    assertEquals( 1382, testDateTimeUnit.getYear() );
    assertEquals( 2, testDateTimeUnit.getMonth() );
    assertEquals( 17, testDateTimeUnit.getDay() );
}