assertTrue(multimap().containsEntry(k0(), v2()));
    assertEquals(oldSize + 1, multimap().size());
  }

  @MapFeature.Require(ALLOWS_NULL_KEYS)
  @CollectionSize.Require(absent = ZERO)
  public void testGetNullPresent() {
    initMultimapWithNullKey();
    assertContains(multimap().get(null), getValueForNullKey());
  }

  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
  public void testGetNullAbsent() {