@Test
public void testAddZero() throws Exception {

    Number ratioNumber = new RatioNumber(10, 0.1);
    Number zero = 0;
    assertEquals(ratioNumber, LoadEntry.DataLocality.add(ratioNumber, zero));
    assertEquals(ratioNumber, LoadEntry.DataLocality.add(zero, ratioNumber));
    assertEquals(zero, LoadEntry.DataLocality.add(zero, zero));
}