assertThrows(NullPointerException.class, () -> getMultiset().count(null));
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  public void testCount_nullPresent() {
    initCollectionWithNullElement();
    assertEquals(1, getMultiset().count(null));
  }

  public void testCount_wrongType() {
    assertEquals(