@Test
public void testAddMinutes()
{

    Timestamp testTimestamp = Timestamp.valueOf("2015-12-21 10:34:11");
    int minutesDiff = 99;
    assertEquals(Timestamp.valueOf("2015-12-21 12:13:11"), HerdDateUtils.addMinutes(testTimestamp, minutesDiff));
    assertEquals(testTimestamp, HerdDateUtils.addMinutes(testTimestamp, 0));
    assertEquals(Timestamp.valueOf("2015-12-21 08:55:11"), HerdDateUtils.addMinutes(testTimestamp, -minutesDiff));
}