@Test
public void add() {

    assertEquals(2, AggregationUtils.add(1, 1), delta);
    assertEquals(2, AggregationUtils.add(1L, 1L), delta);
    assertEquals(2, AggregationUtils.add(1F, 1F), delta);
    assertEquals(2, AggregationUtils.add(1D, 1D), delta);
    assertEquals(2, AggregationUtils.add(1D, 1L), delta);
}