assertEquals(getNumElements() - 1, getMap().size());
  }

  @MapFeature.Require({SUPPORTS_PUT, SUPPORTS_REMOVE, ALLOWS_NULL_VALUES})
  @CollectionSize.Require(absent = ZERO)
  public void testCompute_presentNullToPresentNonnull() {
    initMapWithNullValue();
    V value = getValueForNullKey();
    assertEquals(
        "Map.compute(presentMappedToNull, functionReturningValue) should return new value",
        value,