assertFalse(multimap().isEmpty());
  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require({ALLOWS_NULL_KEYS, ALLOWS_NULL_VALUES})
  public void testSizeNullKeyAndValue() {
    initMultimapWithNullKeyAndValue();
    assertEquals(getNumElements(), multimap().size());
    assertFalse(multimap().isEmpty());
  }

  @CollectionSize.Require(SEVERAL)