@Test
public void testMinusDays()
{

    DateTimeUnit dateTimeUnit = new DateTimeUnit( 2007, 1, 1 );
    DateTimeUnit testDateTimeUnit = calendar.minusDays( dateTimeUnit, 2 );
    assertEquals( 2006, testDateTimeUnit.getYear() );
    assertEquals( 12, testDateTimeUnit.getMonth() );
    assertEquals( 29, testDateTimeUnit.getDay() );
}