@Test
public void testAddDays()
{

    Timestamp testTimestamp = Timestamp.valueOf("2015-12-21 10:34:11");
    int daysDiff = 99;
    assertEquals(Timestamp.valueOf("2016-03-29 10:34:11"), HerdDateUtils.addDays(testTimestamp, daysDiff));
    assertEquals(testTimestamp, HerdDateUtils.addDays(testTimestamp, 0));
    assertEquals(Timestamp.valueOf("2015-09-13 10:34:11"), HerdDateUtils.addDays(testTimestamp, -daysDiff));
}