@Test
public void multiply() {

    assertEquals(100, AggregationUtils.multiply(10, 10), delta);
    assertEquals(100, AggregationUtils.multiply(10L, 10F), delta);
    assertEquals(100, AggregationUtils.multiply(10F, 10D), delta);
    assertEquals(100, AggregationUtils.multiply(10D, 10L), delta);
}