assertEquals(size + 1, multimap().size());
    }
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)
  public void testPutAllNullValueNullFirst_unsupported() {
    int size = getNumElements();

    assertThrows(
        NullPointerException.class, () -> multimap().putAll(k3(), Lists.newArrayList(null, v3())));

    /*